first report of a newly discovered paleoindian quarry site on the
Transcription
first report of a newly discovered paleoindian quarry site on the
FIRST REPORT OF A NEWLY DISCOVERED PALEOINDIAN QUARRY SITE ON THE ISTHMUS OF PANAMA Georges A. Pearson An archaeological survey on the Azuero Peninsula in Panama has recently discovered a Paleoindian quarry/workshopat the base of a quartz outcrop. The Nieto site contains seldom-seen preforms and flake blanks that provide new information on early-stage reductionstrategies used by Clovis-likepoint makers in the Neotropics. Finished tools recovered at the site include gravers, side scrapers, and large scraper planes. Theproduction offlake blanksfollowed a core reductionand rejuvenation strategy already observed at other Paleoindian sites in Costa Rica and Florida. Although the quartz outcrop is located only a few kilometersawayfrom better-qualitysources of jasper and chert, Paleoindians appear to have preferred this translucent stone for their weaponry. This new information,when combined with late-stage production strategies previously recordedfrom other Panamanian sites, brings us closer to tracing a complete manufacturingtrajectoryfor Clovislikepoints on the Isthmus.It is hoped thatdatafrom the Nieto quarry/workshopwill eventuallyhelp archaeologists determine if the presence of the fluting technique in Central and South America is attributable to a migration of Clovis-related people or a technological diffusion among pre-established southerly populations. Investigacionesarqueol6gicas llevadas a cabo recientementeen la PeninsulaAzuero,Panamd,ha dado como resultadoel descubrimientode una cantera/tallerpertenecienteal HorizontePaleoindio, localizada en la base de un afloramientode cuarzo. Sitio Nieto contienepreformaspoco comunes,y lascas nodularesque proporcionannuevos datos en relacion a las estrategias tempranasde reduccidnempleadas en el Neotrdpico. Entre las herramientasrecuperadasen el sitio se incluyenpicos, raspadores laterales, y grandes raspadoresplanos. Las lascas obtenidas como resultado del proceso de reducci6n de talla y estrategiasde rejuvenecimientoson similaresa las observadaspreviamenteen otros sitios paleoindios de Costa Rica y Florida. Existenalgunos afloramientosdejaspes y pedernalproximosa la cantera/tallerde cuarzo de Sitio Nieto, por lo que pensamos que los pobladorespaleoindios parecen haber tenido una clara preferenciapor el cuarzo con el objeto de elaborar su utillaje de piedra. Los nuevos datos obtenidos sobre tecnicas de manufacturatempranasconectan con las estrategias tardias registradas en otros sitios de Panama, gracias a lo cual hemos podido realizar un trazado aproximadode la trayectoriade producci6nde las puntas Clovis en el Itsmo.Esperamosque los datos de la cantera/tallerde Sitio Nieto tardeo tempranoayuden a los arqueologos a determinarsi la presencia de la tecnica de acanalado paleoindia, en Ame'ricaCentraly America del Sur; es atribuiblea una migracionde poblaciones Clovis, o bien si estairelacionadacon una difusiontecnologica entrepoblaciones pre-establecidasdel sur: ounting evidence has challenged the "ClovisFirst"model of the peoplingof the Americasto the point where it may no longer be tenable.In NorthAmerica,excavations at the Meadowcroft(Adovasio et al. 1978, 1999;Goldberg1999),CactusHill (Johnson1998; McAvoy and McAvoy 1997), Topper(Goodyear 1999,2000), Schaefer,andHebior(Overstreetand Stafford 1997; Overstreetet al. 1995) sites have providedevidenceof humanoccupationspossibly antedatingClovis. Similarclaims have also been madeforSouthAmericansitessuchas MonteVerde M (Dillehay 1989, 1997;Meltzeret al. 1997),Taimataima (Ochseniusand Gruhn 1979), Tibit6 (Correal 1981, 1986), Pubenza(Correal1993), El Abra 2 (Correaland van der Hammen 1977; Hurtet al. et 1977), and LapaVermelha(Laming-Emperaire al. 1975;Prous1986),to namea few.Althoughthe existenceof pre-Clovisgroupsis now morewidely accepted,interpretationof the data from many of these early occupationshas not been unanimous and debates persist (Dillehay et al. 1999; Fiedel 1999; Lynch2001). Over the years, the feasibility of a passage Georges A. Pearson * Departmentof Anthropology,University of Kansas, 622 FraserHall, 1415 JayhawkBlvd. Lawrence,KS 66045-7556 ([email protected]) LatinAmericanAntiquity, 14(3), 2003, pp. 311-322 CopyrightO2003 by the Society for AmericanArchaeology 311 LATIN AM ERICAN ANTI NUMBER 3 VOLUME 14 SEPTEMBER 2003 I a b ci~ d C SAX SOCIETYFORAMERICANARCHAEOLOGY 312 LATIN AMERICAN ANTIQUITY [Vol. 14, No. 3, 2003] Figure 1. Map of Panama showing locations of Nieto quarry/workshop and other early sites. between the NorthAmericanice sheets and even the existence of such a corridorhave been questioned.This challengehas given rise to alternative entrywaysandmigrationroutesto accountfor subLaurentidianpopulations(Andersonand Gillam 2000; Fladmark1979, 1983; Mandryk2001). For example,to explainthe presenceof pre-Clovissites in SouthAmericain the absenceof similaroccupationsfurthernorth,a popularscenarioproposesa late Pleistocene coastal migration along the Pacific seaboardthatbroughtpeopleto SouthAmericawhile bypassingtheinteriorregions(CarvalhoGonqalves et al. 2003; Dixon 1999;Gruhn1988, 1994). Anothertopic of contentionhas focused on the origin and dispersionof the fluting techniquein South America (Ardila 1991; Ardila and Politis 1989;Bell 1965;Bird 1938;Gnecco 1994;MayerOakes 1986a; Jackson 1995; Jaimes 1999). Attemptsto explainthisphenomenonhavecentered aroundthreehypotheses.The firstsuggeststhatthe fluting techniquewas carriedsouth by migrating humanswho were bioculturallyrelatedto North AmericanClovisgroups(Lynch1983;Morrowand Morrow 1999; Ranereand Cooke 1991; Snarskis 1979). The second arguesthatthis manufacturing traitwas diffusedandadoptedsouthby pre-established populations who came into contact with expanding Clovis bands (Bryan 1973, 1983). Lastly,Mayer-Oakes(1986b) proposedthatfluting was independentlyinventedin SouthAmericaand may or may not have diffusednorth. One strategythatcan help untanglethese ideas is to carryout technologicalcomparisonsbetween flutedpoint assemblagesfromNorth,Central,and South America. The degree of affinity between northernandsouthernflutedpointindustrieswould help archaeologists determine if Clovis groups encountered and influenced, replaced or were assimilated,or simply lived alongside pre-established groupspossiblyrelatedto MonteVerdeans. Coupled with a solid chronological framework, technological differences and similaritieswould allow us to distinguishbetween a migrationor a passing of ideas throughpre-Clovispopulations. To help shed light on this problem,an ongoing surveyhas attemptedto locate additionalPaleoin- REPORTS 313 Figure 2. Quartz outcrop and north side of the Nieto quarry/workshop. dianoccupationsin Panama(Pearson1999, 2000; Pearsonand Cooke 2002). This area was chosen becauseof its key geographiclocationand its role as a narrow land bridge that has concentrated human movements between the continents. Regardlessof the route(s)takenby early migrants during the colonization process, the Isthmus of Panamawouldhavebeen an unavoidablestopping placewhilemovingto orfromSouthAmerica.This reportpresentspreliminarydatafroma newly discovered Paleoindianquarry/workshopsite on the Pacific side of Panama. The Nieto Paleoindian Quarry and Workshop Althoughthe majorityof artifactsfoundatNieto consistof unidirectional andmulti-directional blocky core cores, fragments,flakes,andshatter,somebrokentool preforms,flakeblanks,andfinishedimplementswerealso encountered.Withtheexceptionof a few bladeletsand small bladecores, none of the recoveredmaterialcouldbe ascribedto possiblelater preceramicor ceramiccultures.Bifacialreduction of cryptocrystalline stone has not been observedin Panamanian lithicassemblagepost-dating7000 '4C yr B.P.(RanereandCooke 1995, 1996,2002). This peculiarityof the Isthmianarchaeologicalrecord has, in fact, helped researchersidentifyearly sites by the simplepresenceof bifacialthinningflakesof fine-grainedlithicmaterial. Site Location and Description Deposits and Stratigraphy TheNieto site(124 m a.s.l.)is locatedon theAzuero Peninsulaapproximately10 km northwestof the consists of an town of Pese (Figure 1). The qularry of vein translucent exposed gray-white, cryptocrystallinequartzthatjuts fromthe summitof a small hill (Figure2). This outcropforms a pillarlike wall (1 m by 10 m) thatis flankedon bothsides by steepcolluvialslopescontaininga largeamount of culturalandnaturallithicdebris(Figure3). Test excavationswere carriedout on the northernsection of the quarrywhere a Clovis-like projectile pointpreformwas discoveredon the surface(Figure 4a). Lithic artifactswere discoveredlying above and withincolluvialdepositsaroundtheoutcrop.Flakes and other manufacturingdetrituswere strewnon the surface of the north-facing slope, which droppedat an angle of approximately40 degrees. Althoughtheriseis vegetatedwithtreesandshrubs (Curatella americana), evidence of ongoing ero- sion and denudationdue to heavy rain is visible today.The thicknessof the depositsvariedfrom a few centimetersclosest to theexposedveinto more than40 cm at the base of the hill. Sedimentswere homogeneous,and did not show any evidence of weatheringhorizons. [Vol. 14, No. 3, 2003] LATIN AMERICAN ANTIQUITY 314 MN ,'22? 01234 ? SiteN Meters E1C E11C N65 N70 N75 N80 N85 N90 N95 N100 N105 N110 Figure 3. Nieto site map with location of main excavation block and test pits. LithicAssemblage The first diagnostic artifacts discovered at the quarrywere bifacialthinningflakes and a Clovislike pointpreformfragmentthatalertedus to a possible late Pleistocene exploitationof the outcrop. Thus far, cores, large flake blanks, bifacial preforms,variousscrapingandgravingtools, andover 50 bifacialthinningflakeshavebeen discoveredat Nieto (Figure 4). Technological analysis of the materialis still ongoing,andonly preliminarydata (Table1) and descriptionsare presentedbelow. The point preform(Figure 4a) has a sinuous edge due to uncorrecteddeep concavities left by the initiallateralthinningremovals.This preform is differentboth stylistically and technologically fromstemmedfishtailandArchaicprojectilepoints foundon the Isthmus.It was manufacturedfroma large flake, which was progressivelyreducedon both sides, giving it a distinctivebi-convexcrosssection.Initialthinningandshapinghascompletely removedall tracesof the originalflakeblank'ssurface.Significantly,severalisolatedandgroundplatformlobes are still visible on the blade'sedge. On one side, the distal end of whatcould be a fluteor large end-thinningscar is visible just above the break(Figure5). Althoughthe edge of the fracture is squareand was not the result of a "languette" scar (Roche and Tixier 1982)-which could be mistakenfora flute-the distinctionbetweenintentionalremovals,secondaryfractures,andexfoliated breakshas been made difficultdue to the unpredictabilityof this raw material.Nevertheless,fluting of early stage preformswould not be out of REPORTS a <-ZZ> 315 b j 0 dlii c 5 cm d 5 cm e .1., f C m 5 cm n 5 cm X_g 9 h 0 p q Figure 4. Lithic artifacts from Nieto quarry/workshop: (a-g) bifacial preforms; (h) channel flake fragment; (i) possible large flake blank; (j-n) snubbed-nosed scrapers and large scraper planes; (o) large retouched flake; (p-q) blade-like flakes; (r-u) graving tools; (v-w) spokeshaves; (x-y) core bottom rejuvenation segments. LATIN AMERICAN ANTIQUITY 316 ?;~ r?-Y kB r [Vol. 14, No. 3, 2003] S x 5 cm t U 5 cm .tl ::: -----' I y W V Figure 4. (continued) Table 1. Metric Informationfor Lithic ArtifactsIllustratedin Figure4. Artifact (a) Point Preform (b) Point Base (c) Biface (Preform?) (d) Biface Fragment (e) Biface Fragment (f) Biface Preform (g) Biface Preform (h) ChannelFlake (i) Large Flake (Blank) (j) Keeled End Scraper (k) ScraperPlane (1) Keeled End Scraper (m) Side Scraper (n) ScraperPlane (o) Large Retouched Flake (p) Blade-like Flake (q) Blade-like Flake (r) Graver (s) Graver (t) Graver (u) Graver (v) Spokeshave (w) Spokeshave (x) Core Base Segment (y) Core Base Segment Length (mm) 87.86 28.40 92.65 39.45 27.95 55.90 63.55 20.16 68.21 63.40 83.20 86.74 84.30 89.45 71.77 64.70 95.55 26.60 46.50 47.00 31.21 66.10 86.10 100.60 49.16 Width (mm) 50.50 37.90 42.27 29.02 25.95 66.95 58.30 23.77 90.65 40.20 61.10 51.55 48.64 60.00 70.00 37.60 48.30 31.55 37.25 25.35 26.35 38.30 41.55 75.91 30.04 Thickness (mm) 17.20 11.75 14.63 11.40 5.72 21.95 29.20 4.24 23.06 25.35 28.42 34.16 15.10 32.95 26.80 17.20 20.50 8.90 10.20 11.55 9.52 21.00 37.95 38.82 19.15 REPORTS 317 Figure 5. Clovis-like point preform from Nieto showing distal end of possible flute scar. place here since it has alreadybeen observed at other lower CentralAmerican sites such as La Mula-Westin Panama(Ranere2000; Ranereand Cooke 1995, 1996) and Guardiriain Costa Rica (Pearson1998, 2004; Snarskis1979). The Nieto preformcouldbe describedas a stage 4 biface following Callahan(1979), or more precisely a stage 4.1 accordingto Morrow's(1996) reductionscheme. Overshootingthinningflakes, commonly encountered in other Clovis-related workshops(Pearson2002), have not yet been discoveredamongthe manufacturingdebrisat Nieto. A possible explanationfor this could be the low qualityof the lithic rawmaterialthatcausedmany thinningflakesto terminateprematurelyor break. The flaking patternindicates that flintknappers attemptedto drive long flakes past the preform's midline but were rarelysuccessful.Althoughthe crystallinequalities of the lithic raw materialat Nieto areaestheticallypleasingto theeye, its structuremakes it highly unpredictableand an inferior stonefor flintknapping purposes.Manyof the shatter pieces and discarded tool preforms display breaks along linear impuritiesand largerquartz inclusions.Most intriguingis thatthe areaaround Nieto containsmanysourcesof high-qualitycherts and jaspers where bifacial materialis absent. It appearsthatthe beautyof translucentcrystalsover less-attractivestones may have overriddenmore practicalfactors in the decision-makingprocess leading to the manufactureof some points. Similar observationswere made at the La Mula-West workshop,wherePaleoindiansmanufactured many Clovis-like points from brittle, translucentagate cobbles (Ranere2000) found among better-quality cryptocrystallinejaspers. This pattern goes againstpopularnotions of a focused exploitation of high-qualitystones by NorthAmericanClovis groups(Goodyear1979) and may be indicativeof ideologicalaspectsof Paleoindianlife. Thebase of a secondunfinishedprojectilepoint was discoveredless thana meterfromthe preform (Figure4b). This ungroundsegmentdisplays several longitudinalthinningscars or possible guiding flakes,anda slight nippleindicatingthatit was possibly being preparedfor fluting.Evidence for the manufactureof a thirdpoint was providedby the discoveryof a differentlycoloredbrokenchannel flake(Figure2h). The fragmentis straight(i.e., no curvature),parallel-sided,has a slight bi-convex cross-section,andbrokejust below its platform or nipple (Figure6). Its dorsal surfaceis charac- 318 LATIN AMERICAN ANTIQUITY [Vol. 14, No. 3, 2003] Figure 6. Collapsed proximal fragment of channel flake. scarssugterizedby a seriesof small,unidirectional that it several was removed basal following gesting of the and/or some removals thinningattempts may have servedas guidingchannels.Especiallyinteresting was a tool with a broken,bifaciallyworked distal end made on a blue-greenchertflake (Figure 4c). No debitageof this materialwas found at the siteandit mayhavebeenleftbehindafterretooling (cf., Gramly1980). Also found amongthe debriswere early stage preformsand large flake blanksused for the productionof bifacial tools or projectilepoints (Figure4f, g, i). Finishedtools includedgravers,keeled (snubbed-nosed)end scrapers,side scrapers,and scraperplanes (Figure 2j-n, r-u). Several large blade-like flakes (Figure 2p, q) and ridge spalls werealso recovered.Theseelongatedpieces do not display small, preparedplatformsor pronounced curvaturecharacteristicof many Clovis blades (Collins 1999). Otherimportantfindsconsistedof large flake cores and platformrejuvenationsegments(Figure2x, y) displayingidenticalreduction steps as those from the GuardiriaPaleoindian quarry/workshopin Costa Rica (Pearson 1998, 2004), and the Fossil Hole quarrysite in Florida (Hemmings1999).Largescraperplaneswerefashioned on blade-likeflakes and sometimes shaped by a trihedralflakingtechnique.Greateffortswere made to flattenthe ventralsurfacesof these large scrapingtools. Irregularities,such as the bulb of force, and excessive curvaturewere correctedby strikingtheblank'sedges "headon"to detachlarge flakes that would terminatein hinge or step fractures.This tacticensuredthatthe retouchitself did not plunge or compoundthe initialproblemandis removals. comparableto coreplatformrejuvenation this same Significantly, manufacturingtechnique was also observedon theplanesfromGuardiriaand lakes La Yeguada and Alajuela (Pearson 1998, 2002). Overall,the Nieto assemblagemirrorsmanyof the artifactstyles, manufacturingtechniques,and even lithicrawmaterialschoices observedat other Paleoindiansites. Most importantly,it links with the late-stagerejectsandbrokenpreformsdiscovered at La Mula-Westto trace a more complete manufacturing trajectory for fluted lanceolate pointsin Panama. Discussion Severalavenuesof research,such as detailedtechnologicalanalysesandcomparisonsof lithicassemblages, can offer significantclues to the originsof the flutingtechniquein SouthAmerica.However, similarities and differences between North and SouthAmericanPaleoindianlithictools aremean- REPORTS ingless withoutfactoringin contextualdata.That is to say,withouta clearpictureof theculture-adaptive milieu, resemblanceamong artifactswill not necessarilysupporta migrationscenarionor will discrepanciesimply a diffusion of ideas. Lithic assemblagesmust be comparedin relationto the economicsystemsandenvironmentsin whichthey wereused.Moreover,analysesmustexamineentire tool kits and not concentratesolely on projectile points. Otherclues, such as those relatedto group ideologies, although difficult to interpret,would also be useful,since theseabstractelementsareless likely to havebeen borrowed(Storck1991). Even then,analyticalresultsmightstillbe subjectiveand open to numerous personal interpretations.For example, when trying to understandthe cause(s) forthe similaritiesanddifferencesbetweena North AmericanClovis pointanda SouthAmericanfishtail projectilepoint, how can archaeologistsdistinguish between factors such as: (1) changing adaptivestrategies,when groups face new environmentalselective pressures;(2) culturaldistortionandselectiveborrowing,whenanideais passed from one groupto another;or (3) simple stochastic and historical events that may have affected styles, when groupsbecome isolatedand the flow of information is cut off (O'Brien and Lyman 2000)? Whenfacedwith questionsof bioculturalaffinity, there is no escaping the fact that although humanscanmodify andborrowtechnologies,they cannotchangetheirgenes. Consequently,the most robustanalysesandperhapsthe finalarbiterof the debatesmay come fromfutureancientDNA tests. But until more late Pleistocene skeletonsare discovered,archaeologistsmustrelyon variablessuch as tool formandmanufacturing techniquesto make sense of the variability.Unfortunately,the majority of Paleoindiansites discoveredso far in CentralAmericacontainfinishedpointsor preformsin late stages of production(Garcia-Barcena1979; GruhnandBryan1977;Santamaria1981;Snarskis 1979). In most cases, early stage reductionstrategies areobscuredif not completelyinvisiblewhen analyzingfinished or resharpenedtools. The key difference,and thus the importance,of the Nieto site residesin the fact thatthe firsthalf of the manufacturing techniques, including raw material extraction,arerepresentedhere.Coupledwithdata 319 fromotherPanamanian sites(BirdandCooke 1978; Pearson 2000, 2002; Ranere 2000; Ranere and Cooke 1991, 2001), this latest informationbrings us closer to tracinga complete chalne operatoire for Clovis-likepoints on the Isthmus. Conclusion Currentknowledgeon how the firsthumaninhabitantsof Northand SouthAmericarelatedto each othernotonlyhasbeenimpededby geographicdistance butalso by an informationvoid. To this day, the Paleoindianarchaeologicalrecords of North andSouthAmericaremainisolatedfromeachother. Ongoing archaeologicalresearchon the Azuero Peninsulain Panamarepresentsan effort to close this gap. Oneof theprincipalobjectivesof the Isthmiansurveyis to findclues thatwill help us understandthe originsof the flutingtechniquein South America. The newly discoveredNieto quarry/workshop providesnew informationon earlystagereduction strategiesused by Clovis-like point makers.Preliminaryresultsindicatethatthe lanceolatefluted points at Nieto were made on large flake blanks. Secondaryretouchwas invasiveand did not leave pseudo flutes on the recoveredbifaces. Preforms appearto havebeenflutedin theearlystagesof production by isolating and strikinga basal nipple. Large Clovis-like macrobladesand blade cores were not observed at Nieto. Finally, large flake cores, top and bottomplatformrejuvenationsegments, and keeled end scrapers,similar to those found at the Guardiriasite in Costa Rica and Fossil Hole in Florida,attestto a Paleoindiancultural homogeneity across lower CentralAmerica and perhapsaroundthe Gulf of Mexico (Faughtand Dunbar1997;PearsonandBostrom1998). Ongoing fieldworkin CentralAmerica and additional pan-continentalcomparativeanalysesamongPaleoindian lithic assemblages should help us determine if southernflutedpoint makerswere distant cousins of Clovis groupsor contemporaryneighbors who imitatedtheirtechnology. Acknowledgments.Funding for this research was provided by a short-term and a pre-doctoral fellowship from the SmithsonianTropicalResearchInstitute(STRI). I especially wish to thank Robert A. Beckwith for his patience and invaluable assistance in the field. Additional support was provided by Jack L. Hofman and John W. Hoopes of the University of Kansas, as well as by Richard G. Cooke, 320 LATIN AMERICAN ANTIQUITY Dolores R. Piperno, and Cristian Samper of STRI. Carlos Fitzgerald of Patrimonio Historico, Instituto de Cultura, Panama, was also instrumentalin alleviating some of the logistical headaches of fieldwork. This project would not have been possible without the generoushelp and hospitality of Pedro Nieto Fuente, Cesar A. Serrano C., E. Alfonso TejadaCaballero,andAlbertoE. Ruiz de Leon. I would also like to acknowledge the helpful comments by Ruth Gruhn andAnthonyRanereduringthe productionof this report.My colleague, Julia C. Mayo, providedthe Spanish abstract. [Vol. 14, No. 3, 2003] 2003 HumanIntestinalParasitesin the Past:New Findings and a Review. Memorias do InstitutoOswaldo Cruz 98 (Supplement1):103-108. Collins, MichaelB. 1999 ClovisBlade Technology.Universityof TexasPress, Austin. 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