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The Cretaceous ammonite Eopachydiscus and the origin of the Pachydiscidae.

Abstract:

Eopachydiscus Wright, 1955 is confirmed as the earliest, Upper Albian representative of the Pachydiscidae, derived in all probability from a bullate member of the Beaudanticeratinae and giving rise to the Cenomanian-Coniacian Lewesiceras Spath, 1939. Nuclei of Eopachydiscus are ribbed, tuberculate, and constricted, showing even at this stage and date typical pachydiscid ornament; the evolution of Lewesiceras simply involved retention of these features into middle growth. The suggestion that t...

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Institution:
University of Oxford
Department:
Oxford, MPLS, Earth Sciences
Role:
Author
Journal:
Palaeontology
Volume:
26
Issue:
3
Pages:
655-662
Publication date:
1983-01-01
ISSN:
0031-0239
URN:
uuid:eacc1de3-4175-4cb4-98d6-a070a693b4ff
Source identifiers:
81923
Local pid:
pubs:81923
Language:
English

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