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Early-middle Eocene faunal assemblages from the Soh area, north-central Iran: 1. Introduction and pteropods (Mollusca, Gastropoda, Thecosomata) Janssen, A.W.; Jagt, J.W.M.; Yazdi, M.; Bahrami, A.; Sadri, S. (2013). Early-middle Eocene faunal assemblages from the Soh area, north-central Iran: 1. Introduction and pteropods (Mollusca, Gastropoda, Thecosomata). Cainozoic Research 10(1-2): 23-34 In: Cainozoic Research. Backhuys Publishers: Leiden; Weikersheim. ISSN 1570-0399

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Beschikbaar in	Auteurs
VLIZ: Non-open access 271219 [ aanvragen ]

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Trefwoorden

Correlation Earth sciences > Geology > Stratigraphy > Biostratigraphy Geological time > Phanerozoic > Geological time > Cenozoic > Paleogene > Palaeogene > Eocene Iran Taxa > New taxa Mollusca [WoRMS]; Thecosomata [WoRMS] Iran [Marine Regions] Marien/Kust

Author keywords

Holoplanktonic molluscs;

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Auteurs		Top
Janssen, A.W. Jagt, J.W.M. Yazdi, M.	Bahrami, A. Sadri, S.

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Abstract

In the Sarakeh Syncline (Soh area, north of Isfahan, north-central Iran), early and middle Eocene (Ypresian-Lutetian) clays, marls and limestone/marl intercalations have been sampled in two temporary trenches. From Trench-1 (Villa section) and Trench-2 (Estakhr section), eight c. 20 kg samples have been taken for micro- and macrofossil analysis. From the Estakhr section two additional samples, from 18 and 20 metres above the base of the section, which corresponds to the Paleocene-Eocene boundary, have yielded pteropods and bourgueticrinid crinoids. Two sieve residues, lots I-101 and I-103, have provided numerous holoplanktonic molluscs (pteropods); the taxonomy and biostratigraphical implications of these taxa are outlined in the present paper. Five species are described as new: Altaspiratella tavianii sp. nov., Limacina aryanaensis sp. nov., L. perforata sp. nov., L. yazdii sp. nov. and Texacuvierina hodgkinsoni sp. nov. On the basis of these data, the Soh samples most probably are of latest Ypresian or earliest Lutetian age. In terms of pteropod zonation, the present assemblage may be considered to belong to the earliest part of Pteropod Zone (PZ) 10, the boundary between PZ 9 and 10 having been recently redefined by the LAD of Camptoceratops priscus. The crinoids will be described in detail in a forthcoming paper.

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