Detailed trilobite biostratigraphy across the proposed GSSP for Stage 5 (“Middle Cambrian” boundary) at the Wuliu-Zengjiayan section, Guizhou, China

Bulletin of geosciences

Lin JP¹  Yuan JL¹  Sundberg FA¹  Zhao YL¹ 

关键词: Cambrian;    trilobites;    Kaili Formation;    South China;   

DOI  :  

来源: Czech Geological Survey

【 摘 要 】

QuarryingacrossapotentialGSSPofthebaseofCambrianStage5/Series3attheWuliu-ZengjianyansectioninsouthChinaindicatesasignificantchangeintrilobiteandbrachiopodfaunas.TheWuliuQuarryspansapproximately4.5macrossthepotentialboundary,whichistheFADofOryctocephalusindicus(Reed,1910)intheWuliu-ZengjiayansectionoftheKailiFormation.TrilobitetaxafoundconsistofonePagetia,oneRedlichia,oneBurlingia,twoOlenoides,elevenoryctocephalid,andsevenptychopariidspecies.Non-trilobitetaxafoundintheWuliuQuarry,butnotdescribedinthispublication,includetubularshells,inarticulateandarticulatebrachiopods,molluscs,echinodermplates,sponges,algae,acritarchs,andtracefossils.Collectedspecimensdisplaybothflattening,secondarycalcitepreservation,andtectonicdistortion.Manyofthespecieshavepreviouslybeenbasedonlengthtowidthratios.Giventherangeofmorphologiesdemonstratedinthesecollections,severalpreviouslynamedspecieshavebeensynonymized.DetailedcollectionsfromtheWuliuQuarryshowthatthefaunasoftheOvatoryctocaracf.granulata-BathyonotusholopygusandtheO.indicuszoneschangedina20cm,relativelybarreninterval.ThisfaunalturnoverdoesnotcoincidewithalithologicchangeandsuggeststhatthesectionwouldbeagoodlocationfortheGSSPofthebaseofCambrianStage5/Series3.

【 授权许可】

Unknown