Delia Evelina Bruno, Brooke E. Crowley, Jaroslav M. Gutak, Adriana
Transcription
Delia Evelina Bruno, Brooke E. Crowley, Jaroslav M. Gutak, Adriana
Earth-Science Reviews 138 (2014) 300–312 Contents lists available at ScienceDirect Earth-Science Reviews journal homepage: www.elsevier.com/locate/earscirev Paleogeography as geological heritage: Developing geosite classification Delia Evelina Bruno a,b, Brooke E. Crowley c,d, Jaroslav M. Gutak e, Adriana Moroni f, Olesya V. Nazarenko g, Kathryn B. Oheim h, Dmitry A. Ruban b,i,j,⁎, Günter Tiess b,k, Svetlana O. Zorina l,m a CNR-IRSA, National Research Council, Water Research Institute, Via F. Blasio 5, 70125 Bari, Italy International Agency for Minerals Policy (“MinPol”), Austria Department of Geology, University of Cincinnati, Cincinnati, OH 45221, USA d Department of Anthropology, University of Cincinnati, Cincinnati, OH 45221, USA e Division of Geology and Geodesy, Institute of Mining and Geosystems, Siberian State Industrial University, Kirov Street 42, Novokuznetsk, Kemerovo Region 654007, Russia f Research Unit of Prehistory and Anthropology, Department of Physical, Earth and Environmental Sciences, University of Siena, via Laterina, 8, 53100 Siena, Italy g Department of Physical Geography, Ecology, and Nature Protection, Institute of Earth Sciences, Southern Federal University, Zorge Street 40, Rostov-na-Donu 344090, Russia h Suffolk County Department of Planning, 4th Floor, 100 Veterans Memorial Highway, Hauppauge, NY 11788, USA i P.O. Box 7333, Rostov-na-Donu 344056, Russia 1 j Department of Tourism, Higher School of Business, Southern Federal University, 23-ja linija Street 43, Rostov-na-Donu, 344019, Russia k Chair of Mining Engineering and Mineral Economics, Department of Mineral Resources and Petroleum Engineering, University of Leoben, Franz-Josef-Strasse 18, A-8700 Leoben, Austria l Central Research Institute of Geology of Industrial Minerals, Zinin Street 4, Kazan, Republic of Tatarstan 420097, Russia m Deparment of Palaeontology and Stratigraphy, Institute of Geology and Oil-Gas Technologies, Kazan Federal University, Kremljovskaja Street 4/5, Kazan, Republic of Tatarstan 420008, Russia b c a r t i c l e i n f o Article history: Received 4 October 2013 Accepted 21 June 2014 Available online 27 June 2014 Keywords: Geological heritage Paleogeographical geosite Paleoecosystem Paleoenvironment Geodiversity Geotourism a b s t r a c t Geological heritage sites (geosites) are sites that contain information about the state and the dynamics of the Earth. Paleogeographical (paleoenvironmental) geosites preserve paleoenvironments, paleoecosystems, and other relevant phenomena. However, the value of these sites can only be fully understood through professional interpretation of the observed features. Description of paleogeographical geosites in terms of the paleospace and the geologic time they encompass is challenging, partially because of many uncertainties in the interpretations of a given geosite and in the paleogeographical, paleobiogeographical, and stratigraphical nomenclature. These geosites can be classified on the basis of facies, paleoecosystems, ichnological value, taphonomic patterns, major events and catastrophes, and geoarcheological potential that they exhibit. Some geosites comprise several subtypes, and some are especially important for construction of paleogeographical maps. Moreover, the paleogeographical geosite type always associates with other types of geosites (20 in total). These combinations form complex geosites that contribute to geodiversity. If information about the Earth's past is especially valuable for a given complex geosite, then the paleogeographical type is dominant. © 2014 Elsevier B.V. All rights reserved. Contents 1. Introduction . . . . . . . . . . . . . . . . . . 2. Paleogeographical geosites: conceptual remarks . . 3. Towards classification of paleogeographical geosites 4. Paleogeography in complex geosites . . . . . . . 5. Conclusions . . . . . . . . . . . . . . . . . . Acknowledgments . . . . . . . . . . . . . . . . . . References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301 301 303 307 308 308 309 ⁎ Corresponding author at: Department of Tourism, Higher School of Business, Southern Federal University, 23-ja linija Street 43, Rostov-na-Donu, 344019, Russia. Tel.: +7 903 4634344. E-mail addresses: [email protected] (D.E. Bruno), [email protected] (B.E. Crowley), [email protected] (J.M. Gutak), [email protected] (A. Moroni), [email protected] (O.V. Nazarenko), [email protected] (K.B. Oheim), [email protected], [email protected] (D.A. Ruban), [email protected] (G. Tiess), [email protected] (S.O. Zorina). 1 For postal communication. http://dx.doi.org/10.1016/j.earscirev.2014.06.005 0012-8252/© 2014 Elsevier B.V. All rights reserved. D.E. Bruno et al. / Earth-Science Reviews 138 (2014) 300–312 1. Introduction Adequate recognition, conservation, promotion, and multi-purpose use of global, national, regional, and local geological heritage have remained an agenda for geologists, nature conservationists, and policy-makers for more than two decades (Black, 1985; Lapo et al., 1993, 1997; Wimbledon et al., 1995, 1998; Wimbledon, 1996, 1999; Kislov, 1999, 2001; Gray, 2004, 2008; Prosser et al., 2011; Ruban, 2010; Ruban and Kuo, 2010; Henriques et al., 2011; Asrat et al., 2012; Brown et al., 2012; Gordon, 2012; Fassoulas et al., 2012; Wimbledon and Smith-Meyer, 2012; Tiess and Ruban, 2013). Additionally, tourism and recreation based on geological objects have evolved to become an important industry (Hose, 1996, 2000; Hose and Wickens, 2004; Doktor and Golonka, 2006; Pajak et al., 2006; Gray, 2008; Dowling and Newsome, 2010; Ruban and Kuo, 2010; Jin and Ruban, 2011; Bruno and Perrotta, 2012; Farsani et al., 2012; Gordon, 2012; Hose and Vasiljević, 2012; Liccardo et al., 2012). Localities with scientifically important, rare, and beautifully preserved fossils and minerals, or other spectacular geological features and landforms, are of primary importance for both of these movements. These geological heritage sites (geosites) frequently incorporate complex phenomena. Available classification systems distinguish several types of geosites, including the paleogeographical (paleoenvironmental) type (e.g., Lapo et al., 1993, 1997; Wimbledon et al., 1998; Kislov, 1999; Ruban, 2005, 2010; Ruban and Kuo, 2010), which is the focus of this paper. The heritage value of many globally important geosites (Wimbledon et al., 1998) and geoparks (http://www.unesco.org/en/natural-sciences/ environment/earth-sciences/geoparks/some-questions-aboutgeoparks/where-are-the-global-geoparks/ and europeangeoparks.org) is determined by the paleogeographical (paleoenvironmental) information that they exhibit. Reynard et al. (2007) went so far as to propose the evaluation of paleogeographical value for all existing geosites (see also Bruschi and Cendrero, 2009), although not all geosites (e.g., exposures of igneous rocks) necessarily exhibit paleogeographical features. The objective of this paper is to present a template for evaluating a broad range of paleogeographical phenomena in terms of geological heritage. Our three main goals include: 1) Defining paleogeographical geosites and outlining their specific features; 2) Developing a provisional classification for paleogeographical geosites (this classification should be specific to geoconservation); 3) Demonstrating the complexity of paleogeographically-important geosites. This paper is based on published literature as well as our own field experience. We focus only on the “in-situ” geological heritage that is preserved in geosites, geoparks, geological reserves, etc. (either designated legally or not) and do not discuss “ex-situ” geological heritage such as museum collections and reconstruction exhibitions. Similarly, although the ideas of so-called “rewilding” (e.g., Martin, 2005; Zimov, 2005; Allison, 2012; Zimov et al., 2012a,b; Levy, 2013), form (at least theoretically) the basis for a fundamentally new kind of paleogeography-related geological heritage, their discussion is beyond the scope of the present paper. We intend to demonstrate to geoconservationists how geological knowledge can be used to better evaluate geosites, as well as attract the attention of geologists working with various paleogeographical phenomena to the heritage value of sites they visit and study. 2. Paleogeographical geosites: conceptual remarks Geosites are “geological objects or fragments of the geological environment exposed on the land surface, thus, accessible for visits and studies” (Ruban, 2010, p. 326). They supply information useful for science, education, and tourism/recreation, and, thus, they bear heritage value (Ruban and Kuo, 2010). Although many exposed geological objects are potential geosites, evaluation of their heritage value is necessary 301 to designate them as true geosites. This will also help rank their relative importance (global, national, regional, or local). The heritage value is linked to geosite uniqueness, which may reflect either rare or, in contrast, typical geological features. Evaluating heritage value is possible via comparison with other similar geosites (Ruban, 2005, 2006a, 2010). Esthetic properties of the potential geosite and its landscape context as perceived by visitors are also important (e.g., Reynard et al., 2007; Gray, 2008; Bruschi and Cendrero, 2009; Nazarenko and Gorbatcheva, 2009; Ruban, 2011a; Fassoulas et al., 2012), but, of course, they are only supplementary to the main evaluation procedure. These properties are chiefly important when the tourism and recreation importance of a geosite is discussed (Hudson, 2013; Kirillova et al., 2014; van der Jagt et al., 2014). The simple concept of geosite recognition (Fig. 1) links a broad spectrum of relevant ideas (e.g., Lapo et al., 1993; Wimbledon et al., 1995; García Cortés et al., 2000; Prosser et al., 2006; Reynard et al., 2007; Bruschi and Cendrero, 2009; Fassoulas et al., 2012). In order for geosites to retain their value to society (e.g., Asrat et al., 2012; Farsani et al., 2012), they must be protected from negative natural and anthropogenic influences, including damage from visitors. Sometimes, debris removal and even restoration are necessary (for more details see Prosser et al., 2006). As mentioned above, paleogeographical geosites have been distinguished by many specialists (Lapo et al., 1993; Wimbledon et al., 1998; Kislov, 1999; Ruban, 2005, 2010; Ruban and Kuo, 2010). Generally, they can be defined as geological heritage sites that represent paleoenvironments in general or highlight particular paleoenvironmental features, which are of special interest for science, education, or tourism/recreation. Paleogeographical geosites can be outcrops, roadcuts, quarries, etc. representing preserved elements of the ancient environment or permitting evaluation of ancient environments through indirect, but valuable geological evidence. An example is the Oshten Mountain in the Western Caucasus (Fig. 2A), which is a well-preserved Late Jurassic reefal massif. Such geosites could also be called “paleoenvironmental geosites”, but the term “paleogeographical geosite” is preferred here to follow the original classification of geosites proposed by Ruban (2010) and Ruban and Kuo (2010). A special distinction of the paleogeographical type of geosites is necessary because some other types of geosites (for example, magmatic or structural geosites) do not necessarily provide valuable information about the geological past. And the paleogeographical type may not dominate complex geosites. There are different meanings of the term “paleogeography”. Even some important reference volumes (e.g., Gornitz, 2009) do not clarify this term. Whereas some specialists often mention the relevant phenomena (e.g., facies) together with sedimentology and stratigraphy, other specialists (including those from Russia) tend to treat paleogeography as a sub-discipline of the historical geology (cf. Jain, 2014). And there is yet another complication. Lists compiled by Wimbledon et al. (1998) indicate only geosites named “paleoenvironmental”. Here we propose to define paleogeographical geosites as broadly as possible. We argue that they should include sites that preserve physical paleoenvironments sensu lato, paleoecosystems sensu lato, and their dynamics on any time scale. Paleogeographical geosites may also preserve paleoclimatological, paleoceanographical, paleobiological, and geobiological (sensu Bottjer, 2005) phenomena. Two specific features of paleogeographical geosites make them very different from most other geosites. The first is that paleogeographical geosites exhibit information about ancient phenomena that started and ended in the more or less remote geological past. The heritage of these sites includes those features that help visualize something no longer in existence, as well as the interpretation of this event, environment, or community. Therefore, we need an additional interpretive “lens” for recognition of paleogeographical geosites (Fig. 1). The other specific feature of paleogeographical geosites is their complexity. Paleoenvironments and paleoecosystems, as well as modern landscapes and biotic communities are multi-component systems. Sedimentary, taphonomic, and other 302 D.E. Bruno et al. / Earth-Science Reviews 138 (2014) 300–312 Fig. 1. Schematic representation of the concept of geosite recognition (for more details see Ruban, 2005, 2006a, 2010; Ruban and Kuo, 2010; Ruban, 2011a; Fassoulas et al., 2012). geological processes inhibit preservation of all these components and their relationships in the rock record. This complicates interpretation of ancient environments and ecosystems. Therefore, each preserved feature that facilitates our understanding of past environments and ecosystems becomes precious. Paleogeographical geosites can be characterized spatio-temporally; they can be attributed to a given paleogeographical domain, given paleobiogeographical unit (biochore), and given period, epoch, or age. However, there are two main challenges for spatio-temporally placing paleogeographical sites: 1) Uncertainties in paleogeographical, paleobiogeographical, and stratigraphical interpretations, as well as the possibility of reinterpretations at a given geosite; 2) Variation in the nomenclature used to define paleogeographical, paleobiogeographical, and stratigraphical units on international and regional scales (Gradstein et al., 2004; Ogg et al., 2008; Ruban, 2009a; Gradstein et al., 2012, stratigraphy.org). For example, a Late Jurassic paleoreef exposed presently as the Oshten Mountain in the Western Caucasus (Fig. 2A) can be attributed to the Caucasian Sea, the Mediterran-Caucasian Paleobiogeographical Subrealm. However, the true extent and integrity of the Caucasian Sea (proposed as a paleogeographical unit by Ruban, 2006b) depend on regional paleotectonic reconstructions that still require some refining. Moreover, the location of the paleoreef was likely controlled by a long-lived shear zone (Khain, 1962), which inherited the Gondwana-derived nature of the Greater Caucasus (Ruban et al., 2007), although the Late Jurassic Fig. 2. Examples of paleogeographical geosites: A – Oshten Mountain (height — 2804 m) in the Lago-Naki Highlands, Western Caucasus, southwestern Russia – an exposed Late Jurassic reef (photo by O.V.N.); B – Fisht Mountain (height — 2867 m) in the Lago-Naki Highlands, Western Caucasus, southwestern Russia – an exposed Late Jurassic reef (photo by O.V.N.); C – the Jaja-Petropavlovskij section in the Kemerovo Region, southern Siberia, Russia – deposits of a Late Devonian catastrophic lake outflow (photo by J.M.G.); D — the sequence of sandstones and limestones in the marine terraces of ViboValentia, Calabria, southern Italy (photo by D.E.B.). D.E. Bruno et al. / Earth-Science Reviews 138 (2014) 300–312 massif of the region developed on the northern margin of the Neo-Tethys Ocean (Ruban, 2006b). Even the nature of the Paleozoic Greater Caucasus terrane (and, consequently, the above-mentioned shear zone) remains debatable (Ruban, 2013a; Stampfli, 2013). The Mediterran-Caucasian Subrealm is advocated by Westermann (2000), but this biochore is not widely recognized by modern paleobiogeographers, who often prefer to refer to the Western Tethys or the Tethys as a whole. Finally, because the Upper Jurassic chronostratigraphy of the Western Caucasus (Rostovtsev et al., 1992) is yet to be improved, the age of the carbonates that constitute the Oshten Mountain requires further investigation. In summary, the spatio-temporal scale to which this ancient reef can be attributed varies widely. 3. Towards classification of paleogeographical geosites Paleogeographical geosites may vary widely in terms of the information they preserve. To objectively discuss what is preserved and the value of this information requires development of a more or less universal classification for characterizing different types of paleogeographical geosites. Geoconservationists need a framework to describe the essence of a particular geosite to avoid oversimplifications or, in contrast, complications. The huge quantity of phenomena that have occurred during the Earth's history makes this a challenging task. For example, shallow-water paleoenvironments with abundant carbonate-producing invertebrates can be described using several classifications of carbonate platforms (Ahr, 1973; Read, 1982, 1985; Burchette and Wright, 1992; Read, 1998; Pomar, 2001; Pomar and Hallock, 2008; Jung and Aigner, 2012; Kim et al., 2012; Pomar et al., 2012). Here, we propose a provisional classification of paleogeographical geosites. It is our hope that this template will be further developed by other researchers who may add subtypes to those discussed below. It should be stressed that this classification is developed for the purposes of geoconservation. For instance, it can be employed for brief, but precise description of a given geosite, measurement of geodiversity (see below), adequate promotion of a particular geosite, etc. Geoconservationists need such a classification, because their practical work requires abridged, but more or less comprehensive synopses of numerous paleogeographical (paleoenvironmental) issues that are discussed in the professional geological literature. This classification is similarly important for other geologists because it will give them a framework for interpreting the heritage values for research sites. At least six criteria can be employed to distinguish subtypes of paleogeographical geosites: facies, paleoecosystems, ichnology, taphonomy, events/catastrophes, and geoarcheological features (Table 1). We consider each of these in detail below. Several categories can be distinguished within each of these subtypes on the basis of current geological knowledge and the available classifications of paleogeography-related phenomena. One should note that a paleogeographical geosite might have characteristics that could place it in several of these proposed subtypes. We argue that the most important or unique features should be used for establishing the dominant subtype(s). 303 The facies subtype of paleogeographical geosites can be distinguished based on the general characteristics of the rock units that are present in a given outcrop (Table 2). For example, Paleogene siliciclastic turbidites (deeper-marine siliciclastic facies) exposed on the Kalipur–Shibpur coast of the North Andaman Island (Indian Ocean) represent the activity of gravity flows on an ancient island slope (Bandopadhyay, 2012). Of course, there are many kinds of facies that are not reflected in common classifications (Table 2). For instance, deposits (and relevant fossil communities) interpreted as indicators of ancient rocky shores (Johnson, 1988; Johnson and Baarli, 1999; Johnson, 2006; Johnson and Ledesma-Vázquez, 2009; Johnson and Baarli, 2012) or paleoislands (e.g., Johnson, 2002; Ruban, 2007) are exceptionally rare in the geological record. Their exposures (like Punta Chivato, Punta San Antonio, etc. of the Baja California Peninsula, northwestern Mexico — see Johnson and Ledesma-Vázquez, 2009) are unique geological objects that deserve to be geosites. The Merzhanovo section on the northern shore of the Azov Sea (southwestern Russia) provides an example of a geosite representing another unusual facies (Ruban, 2011b). Here, upper Miocene coquinalike deposits accumulated on the cliffed coast of the ancient Tanaiss Paleobay. The paleoecosystem subtype demonstrates particular ecosystems that are known from the geological past, including those with no modern analogs. No universal classification of paleoecosystems can be proposed. One can distinguish them by facies (i.e., the same paleoenvironments discussed above, see also Table 2). It is also possible to classify paleoecosystems based on the biomes or biochores that they represent. Rapid paleobiogeographical changes (e.g., Westermann, 2000) have led to re-organizations of paleoecosystems defined by biochores through geologic time. However, the full diversity of paleoecosystems cannot be deduced by such approaches. Below, we give three examples of paleogeographical geosites belonging to different paleoecosystem subtypes: fossil reef communities, petrified forests, and an early Archean ecosystem. Ancient reef communities were species-rich and highly complex (e.g., Kiessling et al., 2010). The Oshten Mountain in the Western Caucasus (Fig. 2A), as well as the neighboring Fisht Mountain (Fig. 2B) are exposed Late Jurassic reefal massives, which represent a rich paleocommunity of corals, brachiopods and molluscs that populated the warm Caucasian Sea on the northern periphery of the Neo-Tethys Ocean (Khain, 1962; Boiko et al., 1977; Boiko, 1982; Lozovoy, 1984; Rostovtsev et al., 1992; Kuznetsov, 1993; Ruban, 2006b). The Lago-Naki Highlands, which the Oshten Mountain belongs to, have already been proposed as a geosite of national rank based on its geodiversity and uniqueness (Ruban, 2010). The second example of a paleoecosystem subtype is petrified forests, which are reported from a number of regions around the world (although they remain uncommon objects). Petrified forests reveal diverse ancient terrestrial ecosystems, their physical environments, and wood preservation processes. Many petrified forests are not only recognized as geosites, but are also already protected as natural heritage or exploited as geoparks (Dernbach, 1996; Dernbach and Dernbach, 1996; Velitzelos and Zouros, 1998; Röβler, 2001; Dernbach and Tidwell, 2002; Jones et al., 2002; Zouros, 2009, 2010; El-Saadawi et al., 2011; Garcia Table 1 Principal subtypes of paleogeographical geosites discussed in this work (several categories can be distinguished within each subtype — see text for more information). Subtypes Examples (see Fig. 3 for location) Facies Paleoecosystem Ichnological Taphonomic Event/catastrophic Geoarchaeological Complex (comprised of several subtypes) Valuable for paleogeographical mappinga Punta Chivato, Punta San Antonio (Johnson and Ledesma-Vázquez, 2009) Oshten (Fig. 2A) and Fisht (Fig. 2B) mountains Altamura Locality (Nicosia et al., 2000) Solnhofen Fossillagerstätte (Barthel et al., 1990) Jaja-Petropavlovskij section (Fig. 3C) Easter Island (Mann et al., 2007; Mieth and Bork, 2010; Rull et al., 2010; Lipo et al., 2013; Mulrooney, 2013) Gondolin paleocave system (Adams et al., 2007) Dampier Archipelago (Ward et al., 2013) a Special subdivision. 304 D.E. Bruno et al. / Earth-Science Reviews 138 (2014) 300–312 Table 2 Common categories of facies/paleoenvironments and relevant paleogeographical geosite characteristics (based partly on Nichols, 2009; Leeder, 2011; Tucker, 2011). Facies Terrestrial Fluvial Aeolian Lacustrine Pedogenic Glacial Deltaic Marine Shallow-marine siliciclastic Deeper-marine siliciclastic Shallow-marine carbonate Evaporitic (marine) Pelagic (including deeper-water carbonate) Karsticf “Indoor” “Outdoor” Volcanic/volcaniclastic Example of paleogeographical geosite characteristics Exposure of riverine cross-bedding sandstones with rare fresh-water fossils and woody debris. Exposure of desert sandstones with fossil-dune structuresa, also aeolianites and miliolitesb. Exposure of non-marine carbonates with tufa bedsc. Exposure of paleosols. Exposure of tillites. Exposure of ancient deltaic sandstones with fresh-water fossils. Exposure of well-sorted conglomerates that mark paleoshoreline. Exposure of flysch with graphoglyptid trace fossils. Exposure of well-preserved ancient carbonate platformd. Exposure of salts or gypsum layers. Explosure of oceanic red clayse. Carbonate concretions that reflect peculiar environments where they formed; mixed cave sediments. Exposure of bauxites in soil profiles. Exposure of well-preserved ancient center of volcanic activity. a For example, see characteristics of fossil dunes in Blakey et al. (1988), Glennie (1992, 1998, 1999), Patel and Bhatt (1995), Kocurek (1991, 1996), and Simpson et al. (2002). These rock types are described by Patel and Bhatt (1995) and Glennie (1999). Such unusual lacustrine deposits (tufa mark the ancient waterfalls at spillover points) have been recently described in the Mayran Basin system (northeast Mexico) by Amezcua et al. (2012). d Types and general evolution of carbonate platforms are discussed by Ahr (1973), Read (1982, 1985, 1998), Burchette and Wright (1992), Pomar (2001), Pomar and Hallock (2008), Kim et al. (2012), Jung and Aigner (2012), and Pomar et al. (2012). e The nature of oceanic red clays is discussed by Wagreich and Krenmayr (2005), Wang et al. (2011), and Hu et al. (2012). f See Fornòs et al. (2009) for more information on karstic facies. b c Massini et al., 2012; Reichgelt et al., 2013). The petrified forests of Arizona (USA), Chemnitz (Germany), and Lesvos Island (Greece) are among the most famous (see references above). The third example of a paleoecosystem subtype is the exposure of the Apex Basalt in the Pilbara region (Australia). This site preserves evidence of one of the earliest known “ecosystems” that existed on Earth: A pumice raft in the PaleoArchean ocean appears to have facilitated the development of some of the first organisms (Brasier et al., 2013). Paleoecosystems can be studied in detail in the so-called “Fossillagerstätten” (e.g., Wyse Jackson, 2010; Ruban, 2011c). Although Fossillagerstätten are essentially of paleontological heritage (Ruban, 2011c), they also reflect the diversity and the complexity of fossil communities and permit evaluation of paleoenvironmental and preservation conditions (e.g., Cherns et al., 2008; Retallack, 2011). Therefore, it seems reasonable to assign them to the paleoecosystem subtype of paleogeographical geosites (however, they may also be assigned to the taphonomical subtypes mentioned below). Examples of Fossillagerstätten include the Eocene Messel Pit Fossil Site in Germany (Rose, 2012; Schaal, 2012), the Late Pleistocene Rancho La Brea tar pits in the USA (McHorse et al., 2012; Prothero et al., 2012), and the mid-Holocene bone bed at Mare aux Songes swamp on the island of Mauritius (Rijsdijk et al., 2009). The ichnological subtype of paleogeographical geosites includes geologic localities containing trace fossils. Our knowledge of the latter has not only grown spectacularly during the past decade, but it has also been updated (Bertling et al., 2006; Hasiotis, 2006; Seilacher, 2007; Buatois and Mangano, 2011; Callow and McIlroy, 2011; Knaust and Bromley, 2012; Plotnick, 2012). Generally, ichnology provides important evidence of organism–sedimentary environment relationships. Every exposure containing trace fossils should be considered a valuable paleogeographical geosite. An example is the Yutsa locality in the Southern Ciscaucasus (southwestern Russia), where trace fossils occur in Paleocene diagenetically-altered diatomite, which indicates a deepmarine paleoenvironment dominated by accumulation of siliceous material (this leads to a serious update of the earlier regional interpretations). This site has already been proposed as a geosite (Martchenko et al., 2008; Kopenok et al., 2009). A second example is the locality of Altamura in the Apulia Region of southern Italy, known for the high number (~ 30,000) of dinosaur footprints preserved in an area of 15,000 m2. This is one of the most important and spectacular geosites in the world (Nicosia et al., 2000). The 50-m thick “Altamura Limestone”, in which the footprints occur, was formed in a subtidal and intertidal flat environment. Algal carpets on this marshy tidal flat may have facilitated preservation of the footprints (Nicosia et al., 2000). The other internationally known example of a paleogeographical geosite with ichnological value is Laetoli in East Africa. This site is famous for its hominid and other animal footprints preserved in Pliocene volcanic ash (Leakey and Hay, 1979; Leakey, 1987; Musiba et al., 2008; Buatois and Mangano, 2011; Meldrum et al., 2011; Reader, 2011). Finally, the Komati river locality in the Barberton Greenstone Belt (South Africa) is undoubtedly a geosite of outstanding importance. Fliegel et al. (2010) reported the oldest known trace fossil (3.34 Ga) from this site. The taphonomic subtype of paleogeographical geosites embraces localities that record fossil formation under the influence of various biotic and abiotic processes. Diverse taphonomic processes have been responsible for the preservation of paleontological material through time (e.g., Fernández-Jalvo et al., 2011). Categories of this subtype can be distinguished based on the mode of preservation (Fernández-López, 1991, 1995, 2000). Some of the previously mentioned geosites (e.g., petrified forests and Fossillagerstätten) bear distinctive taphonomic features. In a recent study, Chang et al. (2012) discussed the amazing discoveries of Early Cenozoic magnetotactic bacteria preserved as giant magnetofossils from the New Jersey coastal plain (USA) and offshore Antarctica. Aside from providing micropaleontological information, magnetofossils can be used to reconstruct ancient magnetic fields, hyperthermal global climatic events, and other parameters of the ancient environment (Chang et al., 2012; Reinholdsson et al., 2013; Yamazaki and Shimono, 2013). This stresses the paleogeographical heritage value of sites with giant magnetofossils, although the relevant geoconservation activities are yet to be considered. The Solnhofen limestones of Bavaria (Germany) provide another excellent example of a taphonomic paleogeographical geosite (as well as ichnological subtype and Fossillagerstätte) (Barthel et al., 1990). These limestones were deposited in a quiet, hypersaline lagoon during the Tithonian Age (Jurassic). The lagoon was home to a diversity of vertebrate and invertebrate marine fauna. Some terrestrial plants and animals, including Archaeopteryx, are also preserved in these limestones D.E. Bruno et al. / Earth-Science Reviews 138 (2014) 300–312 (Barthel et al., 1990; Bottjer, 2002). Fully articulated skeletons, soft tissue impressions, phosphatized soft tissues and even the stomach contents remain for some of the preserved individuals (Barthel et al., 1990; Wilby and Briggs, 1997; Bottjer, 2002). Such exceptional preservation allows detailed study of the anatomy and, in some cases, diet of the organisms that inhabited this ancient ecosystem. Intriguingly, the hypersaline environment appears to have had some desiccating effects on the preserved organisms. For example, remains from teleost fish and terrestrial vertebrates have severely bent vertebral columns, crustaceans are arched, and crinoid arms are curled (Barthel et al., 1990; Bottjer, 2002). The event/catastrophic subtype of paleogeographical geosites exhibit features important for understanding peculiar long-term and shortterm events in global, regional, or local geologic history, as well as time-specific facies (sensu Brett et al., 2012). These geosites are crucial for understanding large, possibly catastrophic phenomena including mass extinctions, major biotic radiations, glaciations, greenhouse conditions, fluctuations in atmospheric oxygen, and ancient tsunamis (e.g., Bostrom and Ćirković, 2008; Prothero, 2011; Gutak and Ruban, 2013). The transitional Cretaceous–Paleogene deposits that outcrop along the Brazos River in Texas, USA are a typical example of potential event/ catastrophic geosite. These deposits shed some light on events that took place approximately 66 Ma (see stratigraphy.org for the new absolute age of the Cretaceous/Paleogene boundary). They provide evidence of extraterrestrial impact, but prior to the Cretaceous/Paleogene boundary and the mass extinction event (Keller et al., 2007, 2009). Another remarkable geosite that exhibits deposits of a regional-scale event is the Jaja-Petropavlovskij section in Southern Siberia (Russia) (Fig. 2C). Approximately 250 m of coarse red-colored cross-bedding siliciclastics of Late Devonian age exposed in this section was formed as a result of overfilling and catastrophic outflow of water from the Minusa Paleolakes to the Kuznetsk Paleosea (Gutak and Antonova, 2006a,b; Gutak et al., 2009). Late Devonian strata in the neighboring outcrops contain fossil plants, fish, and arthropods (Gutak and 305 Antonova, 2006a,b; Gutak et al., 2009). The Jaja-Petropavlovskij section has already been proposed as a complex geosite for the Kemerovo Region (Gutak et al., 2009). Lightning can act as a significant geomorphic agent in exceptionally small-scale and short-term events (Knight and Grab, 2014). Lightning-related geological objects may preserve information about past local climate conditions, and, therefore, they have important paleogeographical heritage value (general considerations of the lightning phenomenon by Cancio (2013) and Middleton and Sternberg (2013) stimulate diverse thoughts on how this hazard can be interpreted with regard to the ancient environment). Importantly, events do not have to have been catastrophic to be included in the event/catastrophic subtype of paleogeographical geosites. “Ordinary” (but important) events can be represented at geosites of this subtype. For instance, geosites that provide evidence of Cretaceous global sea-level changes (Haq, 2014), the Paleocene planetary-scale transgressions and regressions (Ruban et al., 2010, 2012), or Neogene climatic shifts (Zachos et al., 2001), have paleogeographical heritage value. Also the interaction between Quaternary sea-level fluctuations and regional trend of tectonic uplift (Fig. 2D) has characterized Mediterranean coasts with a sequence of marine and fluvial terraces (Carobene, 1980; Miyauchi et al., 1994; Filocamo et al., 2009) leaving paleogeographical evidence for today. Closely related to the event/catastrophic subtype are those geosites that provide information that facilitates strong scientific debates. For instance, precise dating of some discovered impact craters has not confirmed a link between these craters and mass extinctions (see general critical remarks given by Erwin, 2006; Prothero, 2009, 2011; Racki, 2012). Of course, it cannot be excluded that some impacts triggered biotic catastrophes (Alvarez, 2008; Schulte et al., 2010; Renne et al., 2013). Similarly, an examination of Valanginian (Lower Cretaceous) sections in the Vocontian Basin (southeast France) led Kujau et al. (2012) to conclude that widespread anoxia during the Valanginian did not appear in this basin, and that this anoxic event was less extensive than earlier believed. Fig. 3. Geographical location of examples of paleogeographical geosites mentioned in Table 1. 306 D.E. Bruno et al. / Earth-Science Reviews 138 (2014) 300–312 Finally, the geoarcheological subtype refers to paleogeographical geosites that provide information about human–environment interactions in the geological, prehistorical, or historical past. Such geosites may differ in their essence, scale, or age from other paleogeographical geosites. The paleolake at Ljubljansko barje (Slovenia) is an example of a geoarcheological paleogeographical geosite. Late Quaternary changes in vegetation documented on the basis of palynological analysis of the lacustrine sediments are thought to have resulted from human impact on the local environment (Andrič et al., 2009). Easter Island (Isla de Pascua or Rapa Nui), which is situated in the midst of the Pacific Ocean, provides another example of ecosystem collapse that most likely resulted from human impact, although this scenario remains debatable (Mann et al., 2007; Mieth and Bork, 2010; Rull et al., 2010; Lipo et al., 2013; Mulrooney, 2013). Caves are of special geoconservation importance, because of their archeological and paleogeographical records. For example, the Middle Paleolithic coastal site of Cala dei Santi Cave (Monte Argentario, Tuscany, Italy) yielded several Neandertal “living floors”, and this cave contains a Quaternary deposit, which is crucial for studying regional coastal evolution, climatic events and paleoenvironments during the last 120 ka (Moroni et al., 2010). The Uluzzian archeological sites of Italy (e.g., Grotta del Cavallo and Grotta di Fumane) are important from the paleogeographical point of view because they shed light on the paleoenvironmental and paleoecological contexts of interactions between anatomically modern humans and Neanderthals, as well as human dispersal routes in prehistorical times (Palma di Cesnola, 1989; Benazzi et al., 2011; Boscato and Crezzini, 2012; Moroni et al., 2013; Tagliacozzo et al., 2013). The “Hermit caves” of Amendolara (Southern Italy) provide an example of a geosite (Bruno and Perrotta, 2012) of geoarcheological subtype of paleogeographical type that is also characterized by structural and geomorphological features. These caves were probably excavated by humans during the transition from the Paleolithic to the Neolithic, and they are also thought to have played an important role during Byzantine times as places of hermitage. The natural Romito cave in Southern Italy contains one of the oldest examples of prehistoric art in Italy: the visualization of Bos primigenius (Martini and Lo Vetro, 2011). This depiction of the prehistoric environment by eyewitnesses increases the significance of this locality as a paleogeographical geosite. The Paglicci Cave (Apulia, Italy) is of the same importance, because of the only instance of Paleolithic rock paintings (two horses and a few hands) in Italy (Palma di Cesnola, 2001). One can also distinguish paleogeographical geosites that are valuable for paleogeographical mapping. These may include (but are not limited to) sections representing paleoenvironments and specific paleoecosystems, such as paleoreefs (Fig. 4). Geological objects, which indicate the location of ophiolites, hot spots, orogens, etc. are valuable for paleogeographical mapping. Categories of such geosites depend on the methods of paleogeographical reconstructions (Golonka et al., 1994; Golonka, 2004, 2007; Golonka and Ford, 2000; Golonka and Krobicki, 2004). A typical example of a geosite with paleogeographical mapping value is the Dampier Archipelago in northwestern Australia, where late Cenozoic transgressions and regresisons, as well as the general chronology of landscape change were reconstructed on the basis of the exposed geological objects (Ward et al., 2013). However, two cautions have to be pointed out. First, as many geological objects as possible should be used for construction of paleogeoghraphical maps (this is especially the case of high-resolution maps). However, it is impossible to recognize all included objects as geosites unless they demonstrate significant heritage value. A typical example is shown in Fig. 4. Reconstruction of Early Toarcian paleoenvironments of the central part of Mountainous Adygeja required information from dozens of outcrops distributed on this territory. But only four relatively small exposures could be judged geosites. The other objects are not so valuable with regard to their heritage value. Second, it is evident that structural, igneous, and other types of geosites may provide critical information for paleogeographical mapping. Fig. 4. Example of a simple paleogeographical reconstruction: the Early Toarcian paleoenvironments in the central part of Mountainous Adygeja (Western Caucasus, southwestern Russia). Geological objects established as geosites represent the principal paleoenvironments (outlined tentatively by D.A.R.). Essential information for this reconstruction (partly summarized by Rostovtsev et al., 1992) was obtained from many sections and outcrops, not shown on this figure. D.E. Bruno et al. / Earth-Science Reviews 138 (2014) 300–312 4. Paleogeography in complex geosites Many paleogeographical geosites exhibit features that require assignment to several subtypes of the paleogeographical type simultaneously. In each of these cases, the dominant subtype is difficult to establish because the various subtypes are of relatively equal importance. An example is the Petchitschi section (in the vicinity of the city of Kazan in Russia), where one can observe a late Roadian (Permian) sabkha and shallow-marine facies, dynamics of the ancient shoreline, products of ancient explosive volcanic eruptions, and fossils and ichnofossils representing rich terrestrial and shallow-marine paleoecosystems (Larotchkina, 2007; Silant'ev et al., 2010; Zorina et al., 2011). This geosite, which is planned for inclusion in a future geopark (Vdovets et al., 2010), can be attributed to facies, paleoecosystem, ichnological, and taphonomic subtypes of geographical geosites. Another example is the Gondolin paleocave system in South Africa, which is valuable from the facies, paleoecosystem, and taphonomic points of view; the same geosite also provides evidence of regional hominin presence (Adams et al., 2007). Finally, the spectacular radiolarite outcrop of La Pietra (Tuscany, Italy) located in the La Pietra natural reserve (Gambassini and Marroni, 1998; Moroni et al., in press) could be attributed to both facies and geoarcheological subtypes. The Tuscan Regional Government is considering including this location in the Regional Geo-sites Archive. Undoubtedly, such complex paleogeographical objects are of utmost importance for preserving geological heritage. As noted above, one needs to study rocks, fossils, minerals, other visible features, and chemical anomalies in order to reconstruct a particular paleoenvironment or paleoecosystem (Fig. 1). As a result, the most valuable paleogeographical geosites are complex and contain several other types (Table 3; e.g., Ruban, 2010). Therefore, the potential complexity of paleogeographical geosites is determined, on the one hand, by combination of subtypes of the paleogeographical type (internal complexity; see above for details), and, on the other hand, by the combination of the paleogeographical type with the other types of geosites (external complexity). The importance and quality of information that complex geosites contain should be used to classify these sites. However, because some 307 types may be more valuable than others within the same geosite, a dominant type should be established (Lapo et al., 1997; Ruban, 2009b). For example, the ancient coral reef exposed at the Oshten Mountain in the Western Caucasus (Fig. 2A) is a complex geosite that is valuable from multiple points of view including geomorphological (it is a well-developed and peculiar landform), engineering/applied geomorphological (slope and karstic processes are active), sedimentological (limestones and dolostones constitute this mountain), paleontological (corals and other Late Jurassic fossils are reported from there), and, of course, paleogeographical (a coral reef paleoecosystem is preserved). Because the most unique features of this geosite are linked to the noted peculiar paleoecosystem, it is sensible to attribute the paleogeographical type as dominant in this case. Of course, paleogeographical type is not necessarily the dominant type in all geosites containing a paleogeographic component. On the basis of the above-presented considerations, an algorithm of analysis of the paleogeographical heritage value in geosites is proposed (Fig. 5). Its application is demonstrated by the example of the Oshten Mountain (Fig. 2A). As this is a large Late Jurassic reef, which is unique for the territory of the Western Caucasus, paleogeographical heritage value is present in this geosite. The paleogeographical type dominates (the other types include geomorphological, sedimentary, paleontological, stratigraphical, and some less important), because the uniqueness of this geosite is determined chiefly by the exposure of paleoreef, and not by the mountain shape, lithological peculiarities of limestones and dolostones, and other features of this geological object. According to the classification proposed in this work, the Oshten Mountain geosite can be attributed to the facies subtype (category: shallow-marine carbonate paleoenvironments) and the paleoecosystem subtype (category: paleocommunity of corals, brachiopods, and molluscs). It is logical to conclude that the latter subtype dominates, because it was the activity of reef-building organisms that shaped this carbonate buildup exposed as a modern mountain. Therefore, this geosite shows both external and internal complexity. One of the central concepts in modern geoconservation is geodiversity, which reflects the wide spectrum of geological objects and processes that can be observed in a given territory (Wimbledon Table 3 Types of geosites found in combination with paleogeographical geosites. Geosite typesa Potential combination with paleogeographical type Frequency of type combination with the paleogeographical typeb Stratigraphical Paleontological Sedimentary Igneous Metamorphic Mineralogical Economical Geochemical Seismical Structural Cosmogenic Geothermal Geocryological Geomorphological Hydrological and hydrogeological Engineering/applied geomorphological Radiogeological Neotectonical Pedological Geohistorical Fossil reef with age-diagnostic fossils Petrified forest Oceanic red clay Magmatic massif that was exposed as paleoisland Precambrian schists with primitive fossils Glaucony-rich bed Coal deposit Cretaceous/Paleogene section with Iridium anomaly Seismite bed Fault-controlled cliffed paleoshoreline Ancient impact crater Fossilized hydrothermal vent community Ancient permafrost Presently-exposed reefal massifc; caves and paleokarst Waterfall on exposed reefal massif Modern landslides in Jurassic continental-slope shales Fish-bone beds with radioactive anomaly Seismites linked to deglaciationd Paleosol horizon “Classical” localities of Ediacaran ecosystems; prehistoric mining and salt production sitese Frequently Always Always Rarely Sometimes Sometimes Sometimes Sometimes Sometimes Sometimes Frequently Rarely Always Frequently Sometimes Sometimes Rarely Sometimes Sometimes Sometimes a See classification in Ruban (2005, 2010) and Ruban and Kuo (2010). There are different classifications of geosite types — e.g., see Lapo et al. (1993), Wimbledon et al. (1995, 1998), Kislov (1999, 2001), Massoli-Novelli et al. (1999), García Cortés et al. (2000), Gray (2004, 2008), Prosser et al. (2006), and Bruschi and Cendrero (2009). b Based partly on Ruban (2013b). c See examples in Fig. 2. d Example of soft-sediment deformation structures resulted from ancient earthquakes linked to regional deglaciation has been reported recently from the locality of Siekierki (Poland) by van Loon and Pisarska-Jamrozy (2014). e Riddiford et al. (2012) have shown recently how salt production via evaporation of salt water from naturally occurring brine springs affected the local paleoenvironment. 308 D.E. Bruno et al. / Earth-Science Reviews 138 (2014) 300–312 Fig. 5. Algorithm for classifying geosites that contain paleogeographical information. et al., 1998; Nieto, 2001; Stanley, 2001a; Gray, 2004; Kozlowski, 2004; Zwolinski, 2004; Serrano and Ruiz-Flaño, 2007; Gray, 2008; Serrano and Ruiz-Flaño, 2009; Ruban, 2010; Knight, 2011; Ruban, 2011d; Brown et al., 2012; Burek, 2012; Crawford and Black, 2012; Hart, 2012; Pereira et al., 2013; Solarska et al., 2013). At the very elementary level, geodiversity can be measured as the number of geological phenomena, or geosite types, that constitute the geological heritage of a given region (cf. Ruban, 2010). This idea has been developed into a broader concept (Stanley, 2001b; Gray, 2004, 2008; Knight, 2011). Taking into account the essential complexity of paleogeographical geosites, it is possible to conclude that all of them preserve substantial within-site geodiversity, irrespective of which concept of geodiversity is preferred. 4) Paleogeographical geosites always associate with other types of geosites. Consequently, they are complex and preserve substantial within-site geodiversity. As researchers, our goal should be to share the information preserved at paleogeographical geosites with the general public and decision makers rather than confining this information to those with specialized academic interests. Increasing awareness of the importance and heritage value of paleogeographical geosites will help support proper planning and management decisions as well as promote laws for the protection of geological heritage in private areas. Ultimately, increased awareness will reduce the destruction of geological heritage that would result in an enormous loss to future generations. 5. Conclusions Acknowledgments In this manuscript we have attempted to briefly outline the main characteristics and classifications of paleogeographical geosites. Our main points are summarized below. 1) Paleogeographical geosites exhibit a broad range of features that preserve paleoenvironments, paleoecosystems, and other relevant phenomena. 2) Two specific features of paleogeographical geosites are the impossibility to perceive paleogeographical information directly and their high complexity. 3) At least six subtypes of paleogeographical geosites can be distinguished (facies, paleoecosystem, ichnological, taphonomic, event/ catastrophic, and geoarcheological). Geosites that comprise several subtypes and those valuable for construction of paleogeographical maps should be also noted. Categories can be established within each of these subtypes. The authors gratefully thank the journal editor and two anonymous reviewers for their helpful recommendations and constructive criticism. J.W. Adams (Australia), D. Barettino (Spain), N.I. Boiko (Russia), K.W. Glennie (UK), P.G. Eriksson (South Africa), S.R. Fernández-López (Spain), N.M.M. Janssen (Netherlands), M.E. Johnson (USA), E.V. Kislov (Russia), G.A. Kocurek (USA), A.V. Lapo (Russia), G. Racki (Poland), J.F. Read (USA), W. Riegraf (Germany), R. Rössler (Germany), A.J. van Loon (Netherlands/Poland), W.A.P. Wimbledon (UK), and many other colleagues are acknowledged for their generous help with literature and/or useful communications. D.A.R. thanks his present/former colleagues and students from the Southern Federal University (Russia) for field assistance and fruitful discussions. A part of this work (contribution by S.O.Z.) was funded by the subsidy of the Russian Government to support the Program of Competitive Growth of the Kazan Federal University among the World's Leading Academic Centres. D.E. Bruno et al. / Earth-Science Reviews 138 (2014) 300–312 References Adams, J.W., Herries, A.I.R., Kuykendall, K.L., Conroy, G.C., 2007. 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