Affordable Access

Publisher Website

Upper cenomanian ammonites from the environs of Saumur, and the provenance of the types ofAmmonites vibrayeanusandAmmonites geslinianus

Authors
Journal
Cretaceous Research
0195-6671
Publisher
Elsevier
Publication Date
Volume
2
Issue
1
Identifiers
DOI: 10.1016/s0195-6671(81)80003-1
Keywords
  • Neolobites
  • Calycoceras
  • Lotzeites
  • Pseudocalycoceras
  • Metoicoceras
  • Euomphaloceras
  • Ammonoidea
  • Species
  • Taxonomy
  • Biostratigraphy
  • Upper Cenomanian
  • Middle Cretaceous
  • Upper Cretaceous
  • Saumur
  • Touraine
  • Anjou
  • Western France

Abstract

Abstract Ammonite faunas consisting of Neolobites vibrayeanus (d'Orbigny), Calycoceras ( Calycoceras) naviculare (Mantell), C. ( Lotzeites(?)) sp., Pseudocalycoceras lattense Thomel, Metoicoceras geslinianum (d'Orbigny) and Euomphaloceras septemseriatum (Cragin) from Saumur, within the type area of the Turonian stage, are described from the collections of the Château de Saumur. They allow the recognition of two Upper Cenomanian horizons at Saumur, the one equivalent to the Sciponoceras gracile/Metoicoceras geslinianum Zone as developed in the Sables à Catopygus obtusus/Sables de Bousse of the Cenomanian stratotype; the other, older assemblage equates with the Calycoceras naviculare/Eucalycoceras pentagonum Zone fauna known from the Marnes à Ostracées of the type Cenomanian. From lithological comparisons it is suggested that this area is the source of the types of both Metoicoceras geslinianum and Neolobites vibrayeanus, which are redescribed.

There are no comments yet on this publication. Be the first to share your thoughts.