THE RUSSIAN PLATFORM AS A KEY REGION FOR
Transcription
THE RUSSIAN PLATFORM AS A KEY REGION FOR
Rivista Italiana di Prleontoloeia e Stratigrafia volume 1l0 no. l , pr IIl;' ,t'.;r; I .a,prirzoo+ THE RUSSIAN PLATFORM AS A KEY REGION FOR VOLGIAN/TITHONIAN CORRELATION: A REVIE\tr OF THE MEDITERRANEAN FAUNAL ELEMENTS AND AMMONITE BIOSTRATIGRAPHY OF THE VOLGIAN STAGE MIKHAIL A. ROGOV' Receit-ted September 19, 2002; accepted October 3, 2003 Key uords. Jurassic, Volgian, Tithonian, Boreal-Teth1'an correla- Introduction tion, amnronites, biostratigraphy, Russian Platform. Abstract. A review of the ammonite faunas and biostratieraphy of the uppern.rost Kimmeridgian - lowermosr Middle Volgian of Central Russia is presented. The major role of the Sub-n-rediterranean ammonites in the Volgian assemblages is described, providins additional detail to the existine scheme of Tithonian-Volgian correlations. The base of the Tithonian and the base of the Volgian are coincident, based on the association of Neoc/retocerds steraspis-Lingulaticeras soLenoides.The Klimovi Zone corresponds to nrost of the Hybonotum Zone. However, the top of the Hybonotum Zone, based on the distribution of Paralingulaticeras, Íalls within the Sokolovi Zone.The allocation of r Tenuicostata Subzone (with two horizons: neoburgense and puschi) in the Pseudoscythica Zone is proven. The neoburgense horizon may be correlated with the cíliata md penicillatum horizons of Neuburg and, probably, with the Semiforme Zone. The findings oÍ Lingulatìceras blaschkei, Pseudolissoceras, rnd Sutneria in the Panderi Zone of the Middle Tìthonian suggest that the base of the Middle Volgian may not be younger rhan the Middle Tithonian Fallauxi Zone. Riassunto. Viene fornita una revisione delle faune ad ammoniti e della biostratigrafia dalla sommità del Kimmeridgiano alla parte più bassa del Volgiano medio della Russia centrale. Viene descritto il ruolo principale degli ammoniti submediterranei nelle associazioni Volgiane. Ciò permette di specificare I'esistente schema di correlazione Titoniano-Volgiano. Fondandosi sull'associazion e N eochetoceras sterasp is - Lin gulaticeras solenoides, la base del Tironiano e la base del Volgiano coincidono. La Zona a Klimovi corrisponde alla maggior parte della Zona ad Hybonotum. Tuttavia la parte sommitale della Zona ad Hybonotum, basata sulla distribuzione di Paralingulaticeras, ricad,e nella Zona a Sokolovi. Nella Zona a Pseudoscythica viene dimostrata la ripartizione di una Sottozona a Tenuicostata (con due orizzontí: neoburgense e puscbi). lorizzonte a neoburgense può essere correlato con gli orizzonti a cjliata e penicillatzz di Neuburg e, probabilmente, con la Zona a Semiforme. I ritrovamenti nellaZona a Panderi dei medio-tìtonìani Lingulaticeras blaschkei, Pseudolissoceras e Sutneria suggeriscono che la base del Volgiano medio può non essere più giovane della Zona a Fallauxi del Titoniano medio. Geological Institute of Russian Academy of Over the last few decades several papers devoted to the analysis of mixed Boreal-Tethyan associations of Mollusca, and Tithonian-Volgian correlations (Zeiss 2001Kutek & Zeiss 1997;Hoedemaeker 1991; Sachs et a\.1979: Mesezhnikov 1989; Sey tr Kalacheva1993,1.997; Schweigert 1.993, 1.994, 2000; Scherzinger Er Schweigert 1999) have been published. Unfortunately, material from the Russian Platform was either not studied during those investigations, or only ammonites never described and illustrated before were mentioned. Material and Methods This paper is based on the author's field investigations and collections, and on data collected by PA. Gerasimoq M.S. Mesezhnikov and VV Mitta. The ammonites illustrated are kept in the Geological Institute of Russian Academy of Sciences (RAS) (author's collection, no. GIN MIV MK), Paleontological Institute of RAS (PA. Gerasimov's collection, no. PIN 4861) and in the State Vernadsky Museum (VV Mitta's collection, authors collection, no. SGM BX 17) in Moscow. Unfortunately, the maiority of the collection of M.S. Mesezhnikov (S. Petersburg, VNIGRI) remained inaccessible. Also, most of the Kimmeridgian-Middle Volgian ammonites with Tethyan affinities, quoted by M.S. Mesezhnikov (Mesezhnìkov et a|.1977; Blom et al. 1984; Mesezhnikov 1989; Yakovleva 1993) have not yet been recovered from his collection. Hitherto, only one outcrop of the Russian Platform (Gorodishchi, Fig. 1,3) yielding an Upper Kimmeridgian-Middle Volgian ammonite succession composed of Sub-mediterranean ammonites has been discovered. Last year all the levels containing Tethyan ammonites, identified in the Gorodishchi section, were traced through a number of localities in the middle Volga area (Fig. t), since it is important to ascertain that the sequences of Sub-mediterranean ammonites in different secrions are coincident. As a result, the wide distribution of these ammonites throughout the middle Russirn Sea became apparent. Sciences, Pyzhevskii Lane,7,119017, Moscon, Russia. E-mail: [email protected] l!. A. Rogn' 322 Llr[]q IIlz TFf ro .lllll :ffirr + ffi rz x 1 ITTTilTI LYSKO\'O llilllllìlltìllT s [-,] t: lH 6 F_E r+ iostratigraphy,: PN - Parrderi Zone PU - pust'hilrorizotr N - neoburgetT.rc horizon B - PseLrdoscythica SLrbzone - Sokolovi Zone L - efinroti horizon P S Strr.:r K \\,\S1l N - N.srera.rprs -L.solenoides Beds Fl, F2 - Fallax Subzone [illlfllT]lrllll,lllll s z [l]llllllllllllllrillllllillll t : lllllllTllllTllTllTfl :s llffl]l lfffffffffl] lflffllfltr ll ffi8 t\t 15 rss n 20 E Tflfl ifEffiT8r ffiilr0r 168 Tttrl aIT----------ffi I ffi -r " PI Pì N 't. >\." || \l \ì\tì krn L , S 7 L N Iol crnrost Miclc{lc Vrlgirn Rr'.rpino,6 Murzicr'. Z- lsrdr: r.,i.i). lì - Istaritcs. l3 - Littgrlaticcr-.r.r, l-{ - ParalingtÌaticertslfotttttntcsicllr, l5 - outcrops Ioc;rlin'. Ammonites, zonal nomenclature and correlation cr:rnrplc scc Kutek & Zciss 1997. p1.20. tir. l). M.rcroconchs h;rrc;r lol'er point of rib irrrc;rtion thiìt nlrkcs thcnr ve'rv sinril,rr to IlotLaiskyt klinot'i Since there ;ire different rìpprorches in conrprring the brse of thc Tithonian rnd Volgi'rn stirscs (Schwcisert 199-{t H:rntzpclsue ct .il. l99S). ir is nece sr.rrr to beqin (llov.riskr' IM]. As thc evolutionrrrv tcndcncies of rlicro-,rncl nrrrcroconchs in thc.t.rrrrutirTrltìnttes Ilot;'aisÀ1,,r ìine.rge rrre virirrble (sc'c';rlso dat;r on thc Klinrovj Zonc). rhe gcrrus 1/oi;.ri,,,(-l'.r c:rn bc'subclivicìccl furthcr into nricro- rncl rttlcroconchilte suLrgcner,t, rìlso rrcccptecl ior cocr',rl pcrisphincticl rr:rnrorite s ol Southcrn Ccrrrrrrrr' (Schu'cigc'rt 1996). F-rccpt tor S.lr- this re',,ierv with r description of thc ch:rrircteristics of the uppenlos t Ki n-rr.nerid si;rn F:rl ;rx Subzone (Auti ssioI dorcnsis Zone). (Pl. l. Upper Kimnrcridgian Arrtissiodorcnsis Zonc Zicgler, l9 62 loels ilre lin()\\'n rrlso ixnr l)ollntl (Kuteli & Zciss 1997). but the .rrtnronite rrssocirtions ol tìrc lìussirrn plrrttornr.ìrc nlorc divcrsc. Thc ìorr cl prrt ol thc I:rrllrr SuLrzonc c()ntiì;ns rrunrcrous .S.lrlllIr î,run,rì horizons. IJoth spltinctcsJìtlla.t (llovriskr') l\,l.nrl,,1r1,rcosta/,lttrtusstrbtrndorircll).rrlor),--1. jasottoitlcs (l).rvlorr).J. cr gr..llll-s-,ior1or.cl-.1-s (Cortcru), nrorc r,rrclv Ncor'lrctoterts c[. sttbnttdttrttn 1l:ont.7. LingtÌttittrts solenoitlas (Qucnstctlt) rrncl unîreque nt,'i.'7i116131il.i sp. Thc uppcr part oi thc subzonc contit;ns nl:rinlv S,tnnatispltittttcs sp. nor: IM, nr]. trlicrocorrchs ol this sf.ccics cli[icr ironr (lloveiskr') lnrl in its lol riLr coeificicnt (usurlll rbour ii*. l51.,4spidoceras sp. intl., Gnrle.v,r sp. ind. tn(1 AulrcostelhLúils thcil presc'ncr'. up to the brsr. oi tlrc Lol cr \trlgirn. is cxtrcnrelv r.rrc. It is inrport:rnt to notc th,rt Ocy'rcloccr;r-,, rs we]l ci. jasottoidcs (l)rrvlov), thor-rgh Fallax Sr,rbzone Iloveiskv, 1941. This subzorrc ìs n idch'clisrribrrtcd in thc nritl.llc Volgr lrc.r. lJ,rscrl ttn thc tlistributron of,rnr:ronites, rìris sutrzonc nl;ì\' bc sLrbdividetl inro tl'o ;rrrts. s hìch c,rn be iurthcr consicle,rc.tl .rs .S./.r1lr.r natisphínacs sp. nor:. this Ievel inclucles corìlnron Lingulatic'cras solenoidcs (Quc'nstcdt) (lìoeov 2002b. pl.. iir. l) nttl Naot'l:ctocarts cx !t'. subnutt"tlrnr (lrrrrt.) (lìogov2002e.pl. t,iir. 1,2):Ocbetoccr,T.ic\gr.zro (Oppel) 2.51 iol x Attl"ttostcplutta-t do rrot cxtcntl into thc Tìthonien ;rnri c,rrr ,rs gcncra Lre consiclered charlctcristic oi the'Kinrnreridsi:rn (Schs'eìecrt, pc'r'. conrnr. (for' Otlntotcras)\. Anroug thc oppcliids it is possibìc to notc thc plc\cncc ()f ?T,n'ancllicct',ts tii.Jt',utt'iscttunt (l"ont;rnrrcs) (Corodishchi, lsrtlv sections; lìogor l00lr. pl. l, iir. l; Pl. l. iig. 7) tttlNeotlrtoc'?rds ci.rcboilleti"tlutnt (Bcrckhcnrcr & Hiilder) ([sach scction, Pì. l. lig.S; r'erv closc ro N. rcbou!cri.rtttiltt irr\elru.i1.rrJJ00.1'l.l.ri.l.i'rrc.rrrlre r{,1)(,irhr'lrllrrsrrh't.onc. Ncotlx,tot'er.ts ci. rt'bouletitnntn (not illustrete cl) s,rs rrlso cluotccì ironr the Uppe r Kinrnrerirlgi.rn oi the North Subc.rspiln rcgion (Bogcllnov 193-{) pcrrritting thc corrclation ol thc uppcnrost lìalì;rr Subzone lith rhc raboulatinttlr horizon oi thc Southern (lcnrrrnr' (Rogov 2002r). Upper Jurrtssic of tbe \/olgt area 323 Fig.2 - Schenre of the ammonite distribution. Abbrevi.rtions: U.Kirnrn. - Upuer Kinrnreridgien, Autiss. - HORIZON ORBEDSWTIII z î Au f F-: = f Z Tithonian- Volgian correl;.rtion based on Subboreal Province (qmmorite succ€ssion ofthe Russian Plate) Submeditemaoean Province (after Geyssmt, 1997; Schweiger! 1999; Schweigert et al., 199Q. Middle Titho t is s io doren s is. -l J v l-: >trG z -) tv T iF ! I o = L F 1> = F ,.: J -) 4 +3 <= z z =i fz ';>Z Y2 E q Trì >z -J Mocnrs- frl hcimcnsis l F -J zt.l [ì icclcnsc q v c0 , nsrftrsrri ll - U lmcnsc O u o :Y Ruepcì lianunr T (pail) a Lower Volgian the Neocltetotu'Lts stcl'Ltlfris Lingul"tticarus solutoides Bcris (rt the brrse of thc zone) tncl iltc lithograplicunt eJ'intot'i horizon. . N. .tlcril-r?l.i L. solenoides Becls Roqori 2001. N. -\Ic'ir.'?l.i (Oppel) (Pl.l, fir. l0-11) occurrcnccs irre nunrcroLrs, u'hilst 1/or',ri.sÀ'tz (If or,;riskr.), Lingulctticer,ts solenoitles (Qr"re nsteclt), Sunerid if. bracheri Bc'rckhcnrer ;ìl'r' nlol'e rale (Pl. l, fig. l).These berls nr,rv correspond to tha rueppelliLlttutlt tnLl rietllittgensis horizorrs lncl ln urrnrnrecl horizon (Schs eigc'rt Ei Zeiss 1998) bets'een rhc ruappcllianutt tnd eigeltingense horizons of Southcrn Gr'nlliìn\' (Ssrbie). A nunrbcr of horizons frorl Soutlrcrn Gernrrrnr, :rlso cont:rin Nc,oty';cfot,rir-r ex gr. klintoti (Oppel) tnd Litryul,tticetLts solatoidcs (Quenstc'clt) (Schwcigert, pers. conrnr.), l,lrile 2l',r/ilgrrlaticerts;rre iLrsent ol'\'crv l'irre (rs In]] ch:ìrirctcriz-cd bv,r vcry high point of rib furcatìon. The first appearmce ol Subdicboto,nocerLls (Sphinctoceras) r'Llso occurs in this horizon. Russirrrr hoirlizguLtticeras tnd Fontitnnesielln dilfer fronr the European gcner,r in thc;rbsc'ncc of ventrolatcnl tubercles and in the small shell size. Ns'ertheless, t1'pe of ribbing rnd spectrum of variability within Russi,rn and tvpical Mc'dìtc'rranc'an lmnronites rre the sxne. Thus, Russirrr specìnrens nl;.rv be considered ls endernic species of the genera P,tralingul,rticer"ts a,nd FoiltLtnilesie ll"t.The efintoxi horìz,on corresponds appro\inrrtelv to the cf. e)'stettense-noentsheinensis horizons of Southe rn Gerrr.rrrr.rl, (Irir.2). The level rvith nunlerous Paralingulrtticeras is abscnt in Srvirbir (Schrvcigcrt, pers. cournr.) end Polrrnd. Probably these rnrnrorrites penetrilted into the nriddle Volg;r rrer froÌl the Northern CrLrcrsus, n,lrere dimorphs o'i Paralingulaticer"ts - Fontannesiella proI ithogrdp hi ,rre representccl bv L nt (Fonurn nes) occur. Sokolovi Zone Ilovaisky, 1941 vct in thc Russirn Plrtiornr, but rn rnr:ronite verv closc'to N. notlu/osunr Berclihenrer & H<tlder (nricroconclri;rtc'counterp;ìl't of N. pruecursor) r';rs cliscovcrec] in tlre Mr-rrzicv section (nor in situ) (Pl.l, fiu.9). . eJinroz,i Horiz-on Rogorl 2002. Thc r';rri;rblc spccic's P,rr.rIiuguIctticents cy'rrot'i (Iìogor) (Pl.I, fir. Il-1-j) is conrnron, inclurling nrorphs resenrbling 2 ex gr. ltrcfurleirti (Oppel) (Rogov 2002b, pl., fig. 4) and P perceruli (Fout;rnncs) (Rogov 2002b, pl., fi:l.Z) in thc r"rppcrnrost pirrt. pr'rssin{ into the Sokolovi Zone. NtocJtttorclr-. ci. rrcrìr.rP/i (Oppel), Fottt,tttnasiclla sp. (Pl.l, [ì9.l,1), Haplocair., sp. (Pl.l, fiiì.6), a,nd Gr,t"-esia (inclucling cu ;n rhc riedlingensi,s horiz-on). The sepiìrrìtc lo'c'l with N. pracurrsor Zciss (eigeltingense horizorr) h,rs not Lrccn found q l Klimovi Zone Michailov, 1964 In thc nriddle Vrlga art':r thc Klinrovi zonc'is subdivicled into steraspis J - al )< F F fO o J G. cl. gr,tt'csiatta (Orb.)) ;Ìrc r;ìrc. Ilot;visktt hlintot'i (llovriskv) flvf, nr] lncl 1/otlri-sÈ.lu sp. nor: it will be possible to subdivide this zone rnto two t sokoloti horiz-on below lncl t ptti:ida horizon rbove, Evcntu;rlhi frrnn,rl Ircrrizons, ;rs it is done for tlre z-one in Pol;.rnd (Kutek 6i Zeiss 1997), but at present insufficicnt. Accorcling to Mesezhnikov (Mesezhnikov et :rl. lgZZ; Blorr c't al. l9tÌ-l), I. sokolot'i (lloveisky) occLrrs ne;ìr the base of thc zonc, tosctlrcr with htralingulaticeras b"tebcrleini (Oppel), P perce'',r/r (Font;rnnes). In the ìipper p;rrt oI the Sokolovi Zone, Ilouaishya p.rr.'rrlr (llovaiskv) lM, nrl is present together l'ith rare Borell amnronites (Subdiclntonocer,ts (Sphinctoceras)). The base of the Sokolovi Zone (brsed on the presence ol htralingulaticerrs) lies rvithin the Hybonoturl Zone (Rouor'2002b), end the top is located rvithin the PalrrtinLrs Zone (Kutek El Zeiss 1997). clrrtrr rrre M. A. Rogoo 324 ; i"{ a z aì <N ZP RA\(,t F ={:f: 5 EI I 'i r= E==ll ;-tE ll It EE !i;itl sttl = Zl {i^ ?3 I I >t>o ^c =-H I hr ú,. luEllri'l ;; _,e iÈ;t I ìÉ.ii ,ii* l :E z o J o J =iiìi { ;tr;Èi ll a Li a (llARI\ o T <V ú, 7r.jú;J-= .= I2 a a''Èì= À.: \'E È (, Al\1r\r()\lll cJ ? I lr: -=:Éiì^:5i- ., o , l**È:sììllPiF' Z S O q I'lillì1il :l A I I 2 5 I rizon; An - Anaspidocerds; F - Fontannesielld; F2 - Fallax I Ilotaisk)'a:L- Linguhticer,tslT lt et cerzr ; N.s.- L. s. N oc b et o cerrts :N - N Subzone, uppcr cera s prrt; e o c o e steraspis- Lingulaticeras so/enoides Beds; P P.e. - efimovi Litholosy: clay, 6 a 1 - Parz/ inguLtticeras; horiz-on; P.p. - puschi horizon; Ps. gatites; S - Stntt,ttisphinctcs: St. silt: neoburgense Horizon Rogor', 2002. Anrtspidoceras neoburgense "rsena pl., fiia.10) iìre rArer. Vith the exception of the anrrronites, other r.nol- lusc,r frr:rnr the neoburgense horizon h;rve a Sub-rlediterrlne.rn origìn. Belenrnites ,rre represented only bv Hil:olithes, lnd :r ver), divcrse bivelve asscnrbl;rsc irrcludes con.ìmon M),ophorelLt, and l:rrge Liosn"ea. For rhe îirst tirre since the Oxfordian Procerìtltium is found at this level. This Neoburgense event is not defined in Poland and, probably, is connected to rn increasing ìnfluence of the North-Caucrsian Basin.The neoburgelse horizon is s,ìdely distributcd jn Centr,rl Russìa. In edclition to the Vof gr r.Lre;r, A. neoburgense (Oppcl) is knorvn rrlso ironr the Ural River (llovrìskv & Florensky 1941, pI.23, fis.42,42a) and frorr the Moscow ;rrea (S:rsonov 1953; not illustrated). The prcsence of the,4. neoburgense (Oppcl) lnd the S. dsenLl (Oppel) neoburgense horizon is correlated with penicillatun md ciliata horizons of Neuburg (Fig.2). This horizon, probably corresponds to the Semiforme Zone of the other Tethyen areas, in r.hich the species,4. neoburgense (Oppel) a,nd S. .tserna (Oppel) also xre very nun'rerous (Kutek & \Wierzbowski 1986; Fòzy et al. 1994). . puschi Horiz-on Kutek and Zerss, 1974. The index species of the Puschi Zonc oî Polend (Kutck & Zeiss 197.1) was later replaced by the Tenuicost:rtunr (Zeiss 1977),6ut the first nanre is more preferable in Rnssir, x P tenuicostatun (Michailov) trlso occurs ìnrhe neoburgense horizon. It is probable that Mesezhnikov's (1982) opinton rh:;. P. tenu icosttttun (Michailov) occurs throughout the Pseudoscythica Zone was rvrong. In the Gorodishchi section P tenuicostatunt (Michailov) and P puschi Kutek & Zeiss (Rouoi' 2002, pl., fir.l3) occur approxirnately in ìdentic;rf anrounts, but in the Polevye-Bikshiki secrion P. tenuicost"ttunt (Michailov) stronuly prevrils. Danubisphinctes sp. jur: (Pl.l, fig.1Z) also occurs sporldic,rlly in the Polewe-Bikshikì sections and rare Pseudor:ìt'gatites a[f. seorsus (Oppel) are knorvn fronr the Gorodishchi section (Irie.1, 3). Based on the presence o'i Danubispbinctes spurius (Schneid) in the coeval deposits of Poland, the upper part of the Tenuicostata Subzone can be compared rvith the uppernrost Prlmatus Subzone of Neuburg. Some researchers (e.g. Callomon the uppermost Kimmeridgi;rn ro lorverr.r.rost Middle Voleian). Abbre vi;rtions: A. - Aulacostephatrus; A.n. - neoburgense ho- e IIi . (Oppel) fM, ml is very conrnron (P1.1, fig.l6). Ilo-oaisk1,a cf. pseudosc;,r/ricz (llovaìsky), Pseudot,irgttítes tenuicostdtrz (Michailov) (Pl. l, fig.l8; this species is considered s Pseutloi:irgatites because of the los, positìon of the point of rib furcation in the inner rvhorls), Sutneria (Oppel) (Pl.l, fir.2,3) and ?Pseudolissocerds sp. (Rogov 2002b, Panderi Zone Rosanov, 1906 - Arnrlonite rlnse charts in the Gorodishchi section (from Titrrtrn Zetss 1997) probablv occur in the sanre subzone. Tenuicostxtum Subzone Zeiss, 1977 Middle Volgian 6 Fig. Pseudoscythica Subzone Ilovaisky, 1941. In the nrajority of sections, <>nly I. pseudoscl,t/:ica (llovaisky) [M, m I is known from this level. I. schascbkozae (llor,aisk1,) ancl L ianscbini (Ilovaisky) (Kutek & - drrk-grri' cley; - d:rrk-r.:r.ty;'{ phosphorite nodules. er;r1,, b - Pseudovir- - Sutilerid. I - qr,rl crlc.rreous clay; 3 - nr.rrl; 5 - bituminous shal1, Pseudoscythica Zone Ilovaisky, 1941 The Pseudoscythica Zone is subdivided ìnto trvo subzones Pseudoscvthicrr and Tenuicosrrrunr. tr Birkelund 1982; Hantzpereue et al. 1998; Scherzinger & Schweigert 1999) suggest the presence of a gap between the Lorver and Middle Volgian. However, due to the lÌradual chanses in the Pseudovigratitinae-Virgatitinae linerge, thìs is considered ìmprobable. In the lorvest 0.5 nr of the Panderi Zone in the Gorodishchi section, Dorsopllnitinae occur together with amnronites, which are closer to Pseutlooirgatites, than to Zar"tiskites. Therefore, we cannot be sure th:rt the base of the Panderi Zone tn Russia ,rnd the base of the Scythicus Zone of Poland are coincident. The allocirtion of the detached level rvith Zaraiskites contadictionis (llovaisky) andZ. tliprosopa (Ilovaisky), as proposed by Zeiss (2OOl), ìs questionable. These anrmonites rre found together wirh Zaraisbites s cyt b i c u s (Vischniakoff ), D ors o p I an it e s p an deri (d' O rbigny), Padovia paz:loti (Michrlski) (Mikhailov 1964) and correspond closely to the r';rriabilitv of Z. scytbicus (Vischniakoff). Only the trmnronites named by Ilovaisky (19a1, p.128, pl. 26, fig. 50) as Z. contradictionis var. B differ appreciably front Z. settbicus (Vischniakoff). These .rnrntonites, which resenrble Ilouaiskya, are found in the phosphate nodules horizon in VetÌianka. It is possible that they rvere redeposited from the Lower Voleian. The Pancleri Zone oÍ the Central Russia still cennot be subdivided into f;runal horizons. Hoq,ever, the presence of Zaraishites regu- Upper J urassic of the Volga area laris Kutek in the bituminous shales of the Gorodishchi section and Z. quenstedti (Rouillier), Z. scythicus (Vischniakoff) in the lower part of Panderi Zone suggests that in the future it will be possible to trace also in Central Russia the horizons identified in Poland by Kutek (1994). Z. regularìs Kutek occurs also in the northern areas of the Russian platfornr (Sachs 1976, pl. 22, fig. 2). 325 Dorsoplanites panderi deriZone cannot be younger than the Middle Tithonian Fallauxi Zone (Rogov 2002b). On the other hand, findings oí Zaraiskites regularis Kutek in the Upper Tithonian of the Carpatho-Balkan zone allows us to compxre the uppermost part of the Panderi Zone with the part of Upper Tithonian Calpionella.Zone A (Kutek 1994; Kurek & Zeiss 1997). Ar present x more precise correlation of the Panderi-Virgatus boundary with the Tethyan zonal succession is not possible, is (Vischniakoff ), Pa.o loo ia p av looi (Michalskl),Acuticostites acuticostatus (Michalski),2{. bitrifurcatus Mitta (Mitta I 993) are found in the Panderi Zone. Anrmonites with a Tethyan affinity are very rare. According ro Mesezhnikov (Mesezhnikov et al. 1977; Blom et al. I 984; Yakovleva I 993), in the Gorodishchi section the Panderi Zone contains unfrequent Pseudolissoceras, Sutneria, Glochiceras. Unfortunately, these ammonites have yet to be found in his collection stored in VNIGNI (S. Petersburg). R:r'e Lingulaticeras blaschkei Cecca Er Enay (Pl.l, fig. l3,la) xre known from the Panderi Zone of Chuvashiya and the Tver area (Rogov & Egorov 2002, fig. 1.2 a, b), as well as in the Fallauxi Zone (Richteri Subzone) of Ardèche (Cecca Ec Enay 1991). The presence of this species and anrmonites of the genera Pseudolissoceras r'nd Sutneria, indicates that the lower oart of the Pan- Achnowledgemenrs. I wish to thank Dr. G. Schweigert (Stuttgaft) for providing so much information concerning the ammonite succession of South Germany, including unpublished data. Dr. V V Mitta and Dr. O. A. Erlanger from Moscow kindly loaned specimens of Lingulaticeras blaschkei from the Panderi Zone. Biostratigraphic studies of the Kimmeridgian-Volgian deposits and the presentation of the results was nrade possible with the help of Dr. S. A. Kurenkov (GIN RAS, Moscorv). Valuable suggestions were made by Dipl.-Ing. A. Scherzinger (Hattingen) and by reviewers, Drs. G. Schweigert (Stuttgart) and J.C.V Cope (Cardiff). This publication has been supported by RFBR grant no.03-05-64297. In addition to Zaraishites, tlso (d'Orbigny), D . tlors op la n PLATE I All illustrated in natural size and collected by the author, except for marked specinrens. l. Sutneria {f . bracheri Berckh. Klinrovi Zone, N. steraspis - L. solenoides Beds. Gorodishchi. (x2) GIN MIV 667/l;2. Sutneria cf . asema (Opp.). Pseudoscythica Zone, Tenuicostatum Subzone,neoburgense horizon. Gorodishchi (x2). GIN MK 576; 3. Sutneria asema (Opp.). Pseudoscythica Zone, Tenuicostatum Subzone, neoburgense horizon. Gorodishchi (xa). GIN MK 609; 4, 5. Lingulaticeras blaschhei (Cecca, & Enay). Panderi Zone. BX 17/1. Collected by VV Mitta; 5 - Kimry (Tver area). PIN 4861/25. Collected by PA. Gerasim ov;6. Haploceras sp. ,uv. Klimovi Zone, eJìmooi horizon. Gorodishchi. SGM 572-7 (x2); 7. ?Tarantelliceras franciscanum (Font.). Autissiodorensis Zone, Fallax Subzone. Isedy. GIN MIV 285; L Neochetoceras cf. rebouletianun (Berckh. t{. Hólder). AutissiodorensisZone, Fallax Subzone. Isady. GIN MIV 284; 9. Neochetoceras nodulosum Berckh. Er Hólder. Klimovi Zone, not in situ (?N. ster.tspis-L.solenoid.es Beds). Murzicy. GIN MIV 630; 10. Neochetoceras cf. steraspis (Opp.). Klimovi Zone, N. stertlspis - L .solenoides Beds. Polevye-Bikshiki. GIN MIV 655; 17. Neochetoceras cf. steraspis (Opp.). Klimovi Zone, N. steraspis - L. solenoides Beds. Gorodishchi. SGM 572-22: 12, 13. Paralingulaticer"ts efimooi Rogov Klimovi Zone, efimovi horizon. Gorodishchi. l2 - SGM 572-21; 13 - Holotype SGM 572-l l: 14. Fontannesiella sp., Klimovi Zone, efimoai horizon. Gorodishchi. SGM 522-6; 15. Ocbetocer,ts tf zio (Opp.). Autissiodorensis Zone, Fallax Subzone. Gorodishchi. GIN MIV 692/l;16. Anaspidoceras neobu,Eense (Opp.) [m], Pseudoscythica Zone, Tenuicostatum Subzone,neoburgense horizon. Polevye-Bikshiki. GIN MK 607;17. Danubìspbinctes sp. juv. Pseudoscythica Zone, Tenuicostatum Subzone, puscbi horizon Polevve-Bikshiki. GIN MK 589; 18. Pseudooirgatites tenuicostittzrr (Michailov), Pseudoscythica 4 - Per-vonrayskoe. SGM Zone, Tenuicostrtum Subzone, puschi horizon Polerrre-Bikshiki. GIN MK 582. 326 M. A. 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