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- W2185355962 abstract "The precise chronostratigraphy from the Aptian-Albian boundary to the upper Cenomanian has been established mainly on the distribution of large benthic Foraminifera and dinocysts. Ammonites are rare, and nannofossils and planktonic Foraminifera are absent. In this study species with well-known stratigrap- hic ranges were used and, where possible, reference is made to sequences dated with ammonites. The upper Cenomanian, the Cenomanian-Turonian boundary and the lower Turonian were studied first in the ammonite facies, where Choffat at the turn of the century described different species of Vascoceras. The type sections contain Cenomanian ammonites (Euomphaloceras, Calycoceras and Pseudocalycoceras. Vascoceras ex gr. gamai appears in the Cenomanian Metoicoceras geslinianum Zone. Above this zone, Spathites (Jeanrogericeras) subconciliatus marks the Neocardioceras juddii Zone, here placed in the uppermost Cenomanian. Thus, the lower Turonian is marked by the appearance of Fagesia superstes and F. thevestensis. The different sections in the rudist facies and ammonite facies are correlated. Only Radiolites peroni seems to appear in the lower Turonian. The presence of Durania arnaudi in the Turonian depends on the assignment of the Neocardioceras juddii Zone to the uppermost Cenomanian. Only the lower part of the Turonian has been identified in Portugal. The stratigraphy of the coarse sandstones which separate the lower Turonian from the Coniacian horizon with Hemitissotia ceadourensis, is poorly known." @default.
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- W2185355962 date "1984-09-10" @default.
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- W2185355962 title "Albian-Turonian stage boundaries and subdivisions in the western Portuguese Basin, with special emphasis on the Cenomanian-Turonian boundary in the ammonite facies and rudist facies" @default.
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- W2185355962 doi "https://doi.org/10.37570/bgsd-1984-33-04" @default.
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