Upper Oligocene (Chattian) brachiopod fauna from the Aquitaine Basin, southwestern France and its paleoenvironmental implications

Geodiversitas

Maria Aleksandra Bitner¹  Pierre Lozouet¹  Bruno Cahuzac¹ 

关键词: Brachiopoda;    Upper Oligocene;    Chattian;    stable isotopes;    Aquitaine Basin;    France;    new species;    Brachiopoda;    Oligocène supérieur;    Chattien;    isotopes stables;    Bassin d'Aquitaine;    France;    espèce nouvelle;   

DOI  :  10.5252/g2013n3a4

学科分类：生物科学（综合）

来源: Museum National d Histoire Naturelle

【 摘 要 】

BrachiopodsfromtheUpperOligocene(Chattian),AquitaineBasin,southwesternFrancecompriseninespeciesinsevengenera:NovocraniaLeeamp;Brunton,2001,Terebratulinad'Orbigny,1847,Megathirisd'Orbigny,1847,ArgyrothecaDall,1900,JoaniaÁlvarez,Bruntonamp;Long,2008,MegerliaKing,1850,andLacazellaMunier-Chalmas,1880.Onemegathyrididisdescribedasanewspecies,Joaniapeyrerensisn.sp.,characterizedbyornamentationof6–8distinct,sharpribsandbytriangular,plate-liketeeth.WiththeexceptionofMegathirisdetruncata(Gmelin,1791)andLacazellamediterranea(Risso,1826),allspeciesarerecordedforthefirsttimefromtheOligoceneoftheAquitaineBasin.IntaxonomiccompositionthisbrachiopodfaunadisplayscloseaffinitywiththeMiocenefaunasoftheMediterraneanProvinceandCentralParatethys.ThedominanceofmicromorphicmegathyrididsandthecideidesinthePeyrèreassemblage,characteristicofcryptichabitatssuggeststhepresenceofsubmarinecavesand/orcrevices,thussupportingthepreviousinterpretationsofthisfaunisticassemblageasacavebiocenosis.Frequencyofgastropoddrillingsobservedontheinvestigatedbrachiopodsislow(4%)asisinmostCenozoicbrachiopodpopulations.Thepaleotemperaturescalculatedfromtheδ18Ovaluesofbrachiopodshells(21to24°C)correspondwelltoapaleoenvironmentalinterpretationbasedonpaleoecologyofothertaxonomicgroups.

【 授权许可】

Unknown