Bulletin of geosciences | |
An Early Silurian (Aeronian) cephalopod fauna from Kopet-Dagh, north-eastern Iran: including the earliest records of non-orthocerid cephalopods from the Silurian of Northern Gondwana | |
Ghobadi Pour M1  Popov LE1  Evans DH1  Jahangir H1  | |
关键词: Llandovery; Aeronian; Cephalopoda; palaebiogeography; peri-Gondwana; | |
DOI : | |
来源: Czech Geological Survey | |
【 摘 要 】
ThecephalopodfaunafromtheAeronianQarebilLimestoneofnorth-easternIrancomprisesthefirstcomprehensiverecordofearlySiluriancephalopodsfromperi-Gondwana.Althoughconsistingofrelativelyfewtaxa,theassemblageincludesmembersoftheordersOncocerida,Discosorida,BarrandeoceridaandOrthocerida.CoevalrecordsofseveralofthesetaxaarefromlowpalaeolatitudelocationsthatincludeLaurentia,Siberia,BalticaandAvalonia,andareotherwiseunknownfromperi-GondwanauntillaterintheSilurian.ThecephalopodassemblageoccursincephalopodlimestonesthatcurrentlyrepresenttheoldestrecordofsuchlimestonesintheSilurianoftheperi-Gondwanamargin.Theappearanceofthesecephalopods,togetherwiththedevelopmentofcephalopodlimestonesmaybeattributedtotherelativelylowlatitudinalpositionofcentralIranandKopet-DaghcomparedwiththatofthewestMediterraneansectorduringtheAeronian.This,combinedwiththecontinuedpost-glacialwarmingaftertheHirnantianglaciation,facilitatedtheinitiationofcarbonatedepositionandconditionssuitableforthedevelopmentofthecephalopodlimestoneswhilstpermittingthemigrationofcephalopodtaxa,manyofwhichwerepreviouslyrestrictedtolowerlatitudes.
【 授权许可】
Unknown
【 预 览 】
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