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TaxNo: 4336Gastrioceras crassum
Suborder: Goniatitina
Superfamily: Gastrioceratoidea
Family: Gastrioceratidae
Genus: Gastrioceras
Species: crassum
Qualifier: ss
Author: Wedekind 1914,p.17
Lower Boundary: Yeadonian--Langsettian, Westph.A [YEA--, 313 million years
Upper Boundary: Langsettian--Duckmantian, Westphal.A--B, 311.3 million years