The Global Boundary Stratotype Section and Point (GSSP) for the base of the Cenomanian Stage, Mont Risou, Hautes-Alpes, France

(整期优先)网络出版时间:2004-01-11
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FollowingtheunanimousrecommendationoftheInternationalCommissiononStratigraphy,theGlobalboundaryStratotypeSectionandPoint(GSSP)forthebaseoftheCenomanianStageisdefinedatalevel36metresbelowthetopoftheMarnesBleuesFormation,alevelthatcorrespondstothethefirstappearanceoftheplanktonicforaminiferanRotaliporaglobotruncanoidesSigal,1948,onthesouthsideofMontRisou,eastofRosans,Haute-Alpes,France,whereitcanbeplacedinthecontextofaseriesofsecondarymarkerlevelsbasedonnannofossils,planktonicforaminifera,ammonites,andanornateδ^13Ccurve.