Conodont biodiversity of the Frasnian-Famennian boundary interval (Upper Devonian) in the Southern Urals

Bulletin of geosciences

Tagarieva RC¹ 

关键词: South Urals;    boundary F/F interval;    brachiopod coquina;    conodonts;    brachiopods;    biofacies;   

DOI  :  

来源: Czech Geological Survey

【 摘 要 】

InthesectionsoftheWestUralianFoldedZone(westernslopeoftheSouthUrals)theboundarybetweentheFrasnianandFamennian(F/F)runsatthebottomoftheBarmaHorizon.ItisestablishedwithinalithologicallyhomogeneousbrachiopodcoquinabysimultaneousappearanceoftheconodontPalmatolepistriangularisSann.andbrachiopodParapugnaxmarkovskii(Yud.).ThebrachiopodshellstoneoftheF/FboundaryintervalsubdividedintotheUpperrhenana,linguiformis,Lower–Middletriangulariszonesarethoroughlycharacterizedbymeansofconodonts.IntheupperlinguiformisZoneatthetopoftheFrasnian,allthesectionsshowareplacementofthepalmatolepidbiofacieswithitsabundanttaxaofthegenusPalmatolepisbytheextremelypoor,practicallymonotaxonicriodidbiofacies.ThisisprobablyduetochangesintheglobalsealevelsandtheMassExtinctionEvent(UpperKellwasserEvent)attheF/Fboundary.

【 授权许可】

Unknown