Early Jurassic (latest Toarcian) brachiopods from the northeastern margin of the Western Tethys (Central Iran) and their paleobiogeographical significance |
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| Institution: | 1. College of Life and Health Sciences, Northeastern University, Shenyang 110819, PR China;2. Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, Baltimore, MD, USA;3. Johns Hopkins Institute for NanoBio Technology, The Johns Hopkins University, Baltimore, MD, USA;4. Johns Hopkins Physical Sciences—Oncology Center, The Johns Hopkins University, Baltimore, MD, USA;5. Center of Cancer Nanotechonology Excellence, The Johns Hopkins University, Baltimore, MD 21218, USA |
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| Abstract: | Brachiopod fauna from central Iran, recorded in the upper part of the Shemshak Group and attributed to the upper Toarcian (Pseudoradiosa-Aalensis zones), are reported for the first time in Iran. The assemblage recognized includes six different taxa: Homoeorhynchia sepahanensis nov. sp., formally described in this paper, Globirhynchia subobsoleta, Pseudogibbirhynchia sp., Tetrarhynchiidae sp. indet., Monsardithyris? aff. haresfieldensis, and Zeilleria cf. leckenbyi. Analysis of faunal affinities with other paleobiogeographical regions shows a free connection of the central Iranian brachiopod fauna and wide areas of the northern shelf margin of the Tethys Ocean. This is due to an apparent disruption of bioprovinciality inferred for the late Toarcian-earliest Aalenian, congruent with a connection through the northern seaway across the peri-Laurasian epicontinental platforms. |
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| Keywords: | Brachiopods Systematic Paleobiogeography Central Iran Early-Middle Jurassic transition |
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