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Conodonts from the Niur Formation (Silurian) of the Derenjal Mountains, Central Iran

  • P. MÄNNIK (a1), C. G. MILLER (a2) and V. HAIRAPETIAN (a3)

A Llandovery to Ludlow age for the Niur Formation in the Derenjal Mountains (east-central Iran) is proposed based on new conodont data and previous work on other fossils. The uppermost part of the studied section yielded no diagnostic conodonts but may be Pridoli in age. Some intervals can be dated more precisely: Unit 11 (at least its upper part) is middle Telychian in age and corresponds to the Pterospathodus amorphognathoides lennarti Zone; the lowermost part of Unit 16 is earliest Ludlow in age and corresponds to the Kockelella crassa Zone; the uppermost Unit 16 is late Ludlow (Ludfordian) in age and corresponds to the Ozarkodina snajdri Interval Zone. The Llandovery–Wenlock boundary lies between units 12 and 13 based on sedimentological evidence. The precise location of the Wenlock–Ludlow boundary in the section is not clear but lies below Unit 16. Present-day Iran was located far away from Baltica and Laurentia, on the other side of the Rheic Ocean. This ocean does not seem to have been a major migration barrier for most organisms including the conodonts.

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L. R. M. Cocks & T. H. Torsvik 2002. Earth geography from 500 to 400 million years ago: a faunal and palaeomagnetic review. Journal of the Geological Society, London 159, 631–44.

B. D. Cramer , C. E. Brett , J. M. Melchin , P. Männik , M. A. Kleffner , P. I. McLaughlin , D. K. Loydell , A. Munnecke , L. Jeppsson , C. Corradini , F. R. Brunton & M. R. Saltzman 2011 b. Revised correlation of Silurian Provincial Series of North America with global and regional chronostratigraphic units and δ13Ccarb chemostratigraphy. Lethaia 44, 185202.

M. Ghavidel-syooki , J. J. Álvaro , L. Popov , M. Ghobadi Pour , M. H. Ehsani & A. Suyarkova 2011. Stratigraphic evidence for the Hirnantian (latest Ordovician) glaciation in the Zagros Mountains, Iran. Palaeogeography, Palaeoclimatology, Palaeoecology 307, 116.

V. Hairapetian , H. Blom & C. G. Miller 2008. Silurian thelodonts from the Niur Formation, central Iran. Acta Palaeontologica Polonica 53, 8595.

V. Hairapetian , M. Ghobadi Pour , L. Popov & T. L. Modzalevskaya 2012. Stegocornu and associated brachiopods from the Silurian (Llandovery) of Central Iran. Estonian Journal of Earth Sciences 61, 82104.

V. Hairapetian , M. Mohibullah , L. J. Tilley , M. Williams , C. G. Miller , J. Afzal , M. Ghobadi Pour & S. Hassan Hejazi 2011. Early Silurian carbonate platform ostracods from Iran: a peri-Gondwanan fauna with strong Laurentian affinities. Gondwana Research 20, 645–53.

L. Jeppsson & R. J. Aldridge 2000. Ludlow (late Silurian) oceanic episodes and events. Journal of the Geological Society, London 157, 1137–48.

L. Jeppsson , M. E. Eriksson & M. Calner 2006. A latest Llandovery to latest Ludlow high-resolution biostratigraphy based on the Silurian of Gotland – a summary. GFF 128, 109–14.

S. Lüning , J. Craig , D. K. Loydell , P. Štorch & B. Fitches 2000. Lower Silurian ‘hot shales’ in North Africa and Arabia: regional distribution and depositional model. Earth-Science Reviews 49, 121200.

P. Männik 2007 a. An updated Telychian (Late Llandovery, Silurian) conodont zonation based on Baltic faunas. Lethaia 40, 4560.

P. Männik , D. Loydell & S. Lubeseder 2011. Sheinwoodian (Silurian) conodonts and graptolites from NE Anti-Atlas, Morocco. Lethaia 44, 410–16.

M. A. Purnell , P. C. J. Donoghue & R. J. Aldridge 2000. Orientation and anatomical notation in conodonts. Journal of Paleontology 74, 113–22.

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Geological Magazine
  • ISSN: 0016-7568
  • EISSN: 1469-5081
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