USGS · 70073920
Pachydiscus (Pachydiscus) hornbyense Jones, 1963, and P. (P.) catarinae (Anderson & Hanna, 1935) (Cretaceous, Campanian; Ammonoidea), Pacific Realm marker fossils in the Western Interior Seaway of North America
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W. J. Kennedy, W. A. Cobban. 1999. Pachydiscus (Pachydiscus) hornbyense Jones, 1963, and P. (P.) catarinae (Anderson & Hanna, 1935) (Cretaceous, Campanian; Ammonoidea), Pacific Realm marker fossils in the Western Interior Seaway of North America. https://pubs.usgs.gov/publication/70073920
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