Nautiloid Cephalopods from the Julfa Beds, Upper Permian, Northwest Iran
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NAUTILOID CEPHALOPODS FROM THE JULFA BEDS, UPPER PERMIAN, NORTHWEST IRAN CURT TEICHERT' AND BERNHARD KUMMEL" Aii.sTRACT. Sexenteen species of niiutiloid ceph- Abich (1878), who described the following alopods, from the Upper Permian Julfa Beds of the Araks Araxes west species from ( ) Gorge northwestern Iran are descrihed and discnssed. of Soviet Dzhulfa (the modern generic as- Tlie\ belong to t\\el\e genera. Eight of the species is in : are assigned to, or compared with, pre\iously de- signment placed parentheses ) scrihed species; the remainder is left nnnamed. This Nautilus excentricus Eichwald appears to be one of the richest nantiloid faunas known from beds of very Late Permian age. {Permonautilus) Nautilus propiiKjuus Abich INTRODUCTION (Liroceras) Nautiloicls of Late Permian age are ex- Nautilus parallelus Abich tremely imeommon. In coimeetion with our {Doniatoccras) study of tlie Ali Bashi Formation'' at Kuli-e- Nautilus convergens Abich Ali Ha.slii near Julfa, northwestern Iran (Stenopoceras) (Teichert, Kimimel, and Sweet, in press; Nautilus concavus Sowerby Kummel and in Teichert, 1971, and press), (Liroceras) we were al^le to collect a fairK' large fauna Nautilus clolerus Abich of nautiloids from the underhing Julfa (Doniatoceras) Beds. This is report a description and dis- Nautilus dorsoannatus Abich cussion of this fauna. (Metacoceras) We wish to acknowledge assistance re- Nautilus picJileri v. Hauer ceived from Victoria Kohler, at Harvard (Pleuronautilus) University, and William L. Fisher, at the Nautilus incertus Abich University of Kansas. The material \\'as (Pleuronautilus) collected in 1968, during field work sup- Nautilus tubercularis Abich ported bv National Science Foundation Grant GA-996. (Pleuronautilus) Nautilus (lorsoplicatus Abich PREVIOUS WORK ( Tainoceras) The first record of nautiloids from the Nautilus armeniacus Abich Late Permian of the Transcaucasus was by ( Pseudotitanoceras) Nautilus cornutus Golovinski ^ University of Kansas. (Permonautilus) " Harvard University'. Oiihoceras annulatum ^ Sowerby This formation is being described by Teichert, ( ?Neocycloccras) Kummel, and Sweet (in press). It conesponds Orthoceras cribrosum Geinitz essentially to the "Transition beds" plus "Paiatiro- lites beds" et al. of Stepanov ( 1969 ) (?) Bull. Mus. Comp. ZooL, 144(6): 409-434, March, 1973 409 410 BiiUetin Museum of Comparative Zoology, Vol. 144, No. 6 Orthoceras transversum Abich '"Domatoceras atypicum Shimanskiy (?) ^•'^Domatoceras hunicum (Diener) Orthoceras hicinctum Abich "Domatoceras gracile Shimanskiy k-t:- (") Domatoceras parallehim (Abich) Orthoceras margaritatum Abich Domatoceras cf. gracile Shimanskiy 1 ( ?Neocyc!oceras ) ^^Domatoceras sp. Orthoceras turriteUum Abich ^Pseudotitanoceras arrneniacum (Abich) (?) Permonautihis abichi (Kruglov) Permonautilus sp. Regardless of whether or not the species *'^-?Stearoceras sp. are narrowly defined, for a late Paleozoic ^^Paranautilus pcrcgrimis (Waagen) fauna this an impressively diverse list. In a "Styrioiiaufilus sp. rcstudy of the Soviet Dzhulfian fauna Art- '^*Neocycloceras obUqueannulatum haber (in Freeh and Arthaber, 1900) intro- ( Waagen ) duced only one new species, namely, Pleuro- cf. nautihts verae Arthaber. Even the review of *^?NeocycIoceras cyclophorum ( Waagen ) the stratigraph}' and of these paleontolog)- Abich beds 1910 resulted in **?NeocycIoceras marg(iritatu)n ( ) by Stoyanow ( ) only ?Neocycloceras cf. margaritatum two new species of nautiloids—Orthoceras (Abich) lopingense Stoyanow and Nautihis himiciis lopingense (Stoyanow) Diener. In fact these are the only nautiloids "^Lopingoceras Lopingoceras cf. lopingense (Stoya- described by Stoyanow in that report. In the comprehensive monograph on now) hicinctum the Permo-Triassic formations of So\det ^^'Cycloceras (Abich) Dzhulfa, edited V. E. Ruzhentsev and by Only six of these species were com- T. G. 1965 , the nautiloids were Sarycheva ( ) pletely described and illustrated in the text. studied Shimanski\', who the by recognized These are indicated by a single asterisk in from the Araxoceras and following species the above list. A number of species were Vedioceras beds: illustrated on plates but were not described "^Tainoceras in the text, and these are indicated in the dorsopUcatum ( Abich ) above list a double asterisk. A few '^^Metacoceras dorsoarmatum (Abich) by gen- eral comments on this impressive list of Metacoceras sp. 1 (ex. gr. dorsoarma- are in order. Pseudotemnocheilus tum Abich) species we regard as a synonym of Temnocheilus. ^^Pseudotemm:>cJ}eihis sp. The illustration by Shimanskiy (in Ruz- '^'^Foordiceras sp. 1 hentsev and 1965, ]}\. 14, fig. 7) ^^Foordiceras cf. grypoceroides (Reed) Sar)'cheva, of a specimen of Pseudotemnocheilus is very "'^Foordiceras cf. flemingiamim (Kon- poor, but it seems to be possibly conspecific inck ) with what we describe here as Temno- ""^Tirolonautihis sp. " * cheilus sp. indet. The illustrations of the ?Hexago) i ites sp . various of Foordiceras to be ^"Pleuronaiitihis incertus (Abich) species appear similar to we to Pleuro- Pleuronautihis ci. incertus (Abich) specimens assign Pleuronaiitilus verae (Arthaber) nautilus sp. indet. 2. Tirolonautilus sp. and '^^Pleuronautilus tuhercularis (Abich) Hexagonites sp. were both based on single, "Pleuronautihis dzJndfensis Shimanskiy \'ery fragmentary specimens. On the basis "Pleuroiiautihis costalis Shimanskiy of the illustrations of these specimens, we Pleuronautilus sp. do not believe that they are generically ^"?Phaedrysmocheilus sp. identifiable. The generic identification of ^-^Domatoceras convergens (Abich) Phaedrysmocheilus and Stearoceras were Upper Permian Nautiloids, Iran • Tcidieii and Kummcl 411 (juestioned by Shimanskiy, and. on the basis does not include Pernwnautilus. Faranau- of the ilkistrations he presented, we agree tiJii.s, and Styriotwutihi.s. that these identifications are doubtful. Ex- In an analysis of the nautiloid fauna of the ckiding the orthoccrids it appears that this Julfa Beds it is important to consider the nautiloid fauna of Soviet Dzhulfa includes fauna of the overlying Ali Bashi Fonnation. nine genera, which, as late Paleozoic nau- It is these strata that are of prime impor- tiloid faunas go, is a large number. tance in consideration of the Permian- Triassic boundary of this region. Shimanski}' PRESENT INVESTIGATIONS (in Ruzhentse\- and Sarycheva. 1965: 41) listed the from the The specimens described in the present following species equiv- alents of the Ali Bashi Formation at So\'iet paper were collected by us from that part Dzhulfa beds beds 1-4 of of the section which Stepano\- et ul. (1969) {Phisonitc.s plus the "Induan called Julfa Beds. These correspond to the stage"): Dzhulfian of Stage ( Dzhulfinskiy Yarns) Tainuceras sp. 1 (ex. gr. cluingliiigpiiciise Grunt, and Ru- Arakclyan, Shevyrev {in Chao) zhentsev and 1965: 23). .\11 col- Sarycheva. Tainocero.s sp. 2 (ex. gr. changlingpuense lections were obtained in a small side valley, Chao) to the main access \'alle\' to Kuh- parallel Tainoccra.s sp. 3 8 of and c-Ali Bashi, about km west Julfa Metacoceras sp. 2 (ex. gr. dorsoainuitinn about 200-300 m upstream from our .\li Abich) Bashi locality 4 (Teichert, Kummel, and PFoordice ras s p . 2 Fleuronautilus dieneri v. Sweet, in press). Our collections contain sp. (ex. gr. the following genera and species: Krafft) PFIeuronautilus sp. Lopiuiioccras Iopingen.se (Stoyanow) Tainionautilus sp. cf. L. Lopingoceras sp. lopingense (Stoy- Domatoceras sp. 2 anow ) PSyringomiutihis vagus Shimanskiy Ne cloce ras cf. N. ocy sp. ohJiqueannulatum ?Faranautilus sp. (\\'aagen) PNeocycloceras sp. Tainoceras sp. indet. Onl\- Metacoceras- (lorasluimeme Shimanskiy PSyringonautilus vagus Shimanski)' was described and illustrated in Ruzhen- Metacoceras dorsoarnuitum (Abich) ( tsev and 1965: 163, 16, PlcuroiuiutiJiis sp. indet. 1 Sarycheva, pi. fig. Most of the were Fleuronautilus sp. indet. 2 9). remaining species illustrated b\' Tainiondutihis sp. indet. photographs, unaccompanied The to TeninoclicUus sp. indet. by descriptions. specimen assigned Doiiuitoccra.s Jninicmn (Diener) PSyringonautilus. to judge from the illustra- Domatoceras paralleJuni (Abich) tion, appears to be more likeK' to represent Donmtoceras sp. indet. a species of Stearoceras. Stenopoceras sp. indet. Teichert, Kummel, and Sweet (in press) Titanoccros indet. sp. describe the following species of nautiloids Pscudotitanoccra.s armeniacum (Abich) from the Ali Bashi Formation at Kuh-e-Ali Lirocera.s indet. sp. Bashi: This fauna is essentialh" the same as that PDoIorthoceras sp. from the beds at Soviet corresponding Neocycloceras sp. Dzhulfa for the of Teni- except presence Lopingoceras sp. nocheihis, Tainionautilu.s, and Titonoceras. Tainoceras sp. indet. .\t the same time the Kuh-e-Ali Bashi fauna Metacoceras sp. indet. 412 Bulletin Museum of Comparative Zoology, Vol. 144, No. 6 Table I DlSTRIBUTIOX OF NaUTILOID GeNERA IX JuLFA Beds axd Ali Bashi Formatiox Upper Permian Nautiloids, Iran • Teichert and Kummel 413 Figure 1. Diagram showing inferred phylogeny and geologic distribution of late Paleozoic and Triassic coiled nautiloids. (Adapted from Kummel, 1953.) Vol. No. 6 414 Bulletin Museum of Comparative Zoology, 144, estab- MCZ 9776 4, unfigured speci- placed Lopingoceras in his newly (PI. fig. 11), with- men KU 34435. lished family, Pseudocycloceratidae, out stating reasons. Lop/ngoceras sp. cf. L. lopingense Lopingoceras lopingense (Stoyanow) (Stoyanow) Plate 4, figures 13, 14 Plate 4, figures 9, 1 1 Our collections