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TaxNo: 5010Pennoceras seamani
Suborder: Goniatitina
Superfamily: Gonioloboceratoidea
Family: Wiedeyoceratidae
Genus: Pennoceras
Species: seamani
Qualifier: ss
Author: Miller & Unklesbay 1942,p.147
Lower Boundary: UPA Brush Creek Lst. base, 305 million years
Upper Boundary: UPA Brush Creek Lst. top, 299 million years