泰国北部三叠系Lampang群DoiLong组的有孔虫组合与沉积环境

Arichforaminiferalassemblage,consistingofabundantAulotortussinuosusandA.tumidusinassociationwithLamelliconusmultispirus,Endotebaexgr.controversa,E.exgr.badouxi,Endotebanellakocaeliensis,Endotriadatyrrhenica,Endotriadellawirzi,Malayspirinafontainei,Ammobaculitesrhaeticus,Diplotreminaastrofimbriata,Agathamminaaustroalpina,andothers,wasfoundintheDoiLongFormationoftheTriassicLampangGroup,NorthernThailand.TheseforaminiferssuggestthattheformationisreferabletotheCarnian(earlyLateTriassic),whichisconsistentwiththeageestimatedbyammonoids.Inmicrofacies,peloidalgrainstone,bioclasticgrainstone,sponge-microbialboundstone,andooliticgrainstonewererecognizedintheDoiLongFormation.Basedonmicrofacies,threedepositionalfacies,thelagoonfacies,reeffacies,andshoalfacies,arerecognizedinthisformation.TheselinesofevidencearesuggestivethattheDoiLongFormationwasdepositedinareeforbanksettingratherthanarampsetting.