New records of Diplomoceras (Ammonoidea, Diplomoceratidae) from Koryak Upland, North-West Pacific Province: taxonomic, biostratigraphical and palaeogeographical implications
Elena A. Jagt-Yazykova,
Anastasia A. Zolina,
Lina B. Golovneva
Abstract:The geographical and stratigraphical distribution of the heteromorph ammonite genus Diplomoceras within the North-West Pacific Province is briefly reviewed. Although Diplomoceras ranks amongst the more important, globally distributed taxa during the latest Cretaceous, its precise stratigraphical range still is uncertain. Moreover, the status of the various species assigned to this genus is a matter of debate; for instance, two commonly cited forms, Diplomoceras cylindraceum and D. notabile, are considered to b… Show more
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