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TaxNo: 4825Genus Pachylyroceras
Suborder: Goniatitina
Superfamily: Neoglyphioceratoidea
Family: Cravenoceratidae
Subfamily: Cravenoceratinae
Genus: Pachylyroceras
Qualifier: ge
Author: Ruzhentsev & Bog. 1971,p.243
Lower Boundary: DER Go beta--gamma, granos.base [P1--P2], 328.2 million years
Upper Boundary: UTX Barnett Fm. top, 323 million years