Conodonts across the Devonian/Carboniferous boundary in SE Sardinia (Italy)

Bulletin of geosciences

Carta N¹  Mossoni A¹  Corradini C¹  Spalletta C¹ 

关键词: conodonts;    biostratigraphy;    Devonian;    Carboniferous;    Devonian/Carboniferous boundary;    Sardinia;   

DOI  :  

来源: Czech Geological Survey

【 摘 要 】

TheBruncuBullaisection,locatedinSESardinia,exposeslimestonesfromthestyriacusZone(upperFamennian)totheUpperduplicataZone(Tournaisian),buttheUpperpraesulcataZoneisnotdocumented;attheDevonian/Carboniferousboundaryablackshaleslevel,equivalenttotheHangenbergShales,ispresent.Fifty-sixconodonttaxawererecovered,threeofwhichareheredescribedasnewspecies:Polygnathusbicristatus,Po.nuragicus,Pseudopolygnathusgranulobatus;twomorespecies,probablynew,aredescribed,butleftinopennomenclaturebecauseofthelownumberofspecimenscollected.TherelativehighabundanceofProtognathodusandlowabundanceofSiphonodellainsomelevelsandtheoppositeinothersisdiscussed,andanewhypothesisontheoccurrencesofprotognathodidsasinfluencedbyecologicalfactorsissuggested.TheearlyphaseoftheHangenbergcrisisistestifiedbyafaunalturnoverinanimpoverishedfaunawithinthedepositionoflimestonesoftheLowerpraesulcataZone.

【 授权许可】

Unknown