Ammonite faunas and the 'standard zones' of the Cenomanian to Maastrichtian Stages in their type areas, with some proposals for the definition of the stage boundaries by ammonites.
作者： William James Kennedy
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摘要: The 'standard zones' of the Cenomanian to Maastrichtian Stages as applied western European region are critically evaluated, and their development within type areas these stages is reviewed. Proposals for defining bases Upper Cretaceous worldwide using ammonites are: Cenomanian: appearance Hypoturrilites Dubourdieu, 1953 or Neostlingoceras Klinger & Kennedy, 1978; Turanian: Pseudaspidoceras flexuosum Powell, 1963; Coniacian: Forresteria (Harleites) petrocoriensis (Coquand, 1859); Santonian: Texanites species; Campanian: either Placenticeras bidorsatum (Roemer, 1841), Submortoniceras Spath, 1921, on basis evolutionary changes Scaphites hippocrepis (De Kay, 1827) lineage; Maastrichtian: Pachydiscus neubergicus (Von Hauer, 1858).
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