The Cretaceous ammonite Eopachydiscus and the origin of the Pachydiscidae.
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,...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
1983
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