Pseudoperna congesta (Conrad, 1843)

Remarks

• Collector:    Prof. Norm King, University of Southern Indiana

• Formation:  Niobrara Group, Smoky Hill Chalk

• Location:     western Kansas (various localities)

General Info

Synonyms (older names and misidentifications in the literature)

• 1843 Ostrea congesta Conrad

• 1856 Ostrea congesta Conrad

• 1876 Ostrea congesta Conrad; Meek

• 1884 Ostrea congesta Conrad; White

• 1893 Ostrea congesta Conrad; Stanton

• 1907 Ostrea congesta Conrad; Weller

• 1928 Ostrea congesta Conrad; Adkins

• 1941 Ostrea congesta Conrad; Stephenson

• 1942 Ostrea congesta Conrad; Moreman

• 1958 Ostrea congesta Conrad; Richards

• 1967 Ostrea congesta Conrad; Maxwell et al.

• 1971 Pseudoperna congesta (Conrad); Stenzel

• 1975 Pseudoperna congesta (Conrad); Hattin & Cobban

• 1982 Pseudoperna congesta (Conrad); Hattin

• 2002 Pseudoperna congesta (Conrad); Akers & Akers

Stratigraphic Occurrence

• Niobrara Group, Smoky Hill Chalk of western Kansas

• Niobrara Group, upper Fort Hays Limestone of western Kansas

• Austin Group, Hutchins Chalk of north Texas

• Austin Group, Atco Limestone of north and central Texas

Age

• We believe the report from the Eagle Ford Group, Britton Fm to be in error, based on our knowledge of the literature and extensive collecting over the years in the Eagle Ford Group.  This is rather bad, since it appears that this is the reported horizon for the holotype of Conrad.

• The range is certainly from the late Early Coniacian Stage to the Latest Santonian Stage (~87–84 mya).

Geographic Occurrence

• Anderson County, TX

• Collin County, TX

• Dallas County, TX

• Delta County, TX

• Ellis County, TX

• Fannin County, TX

• Gove County, KS

• Grayson County, TX

• Lamar County, TX

• Logan County, KS

• Medina County, TX

• Red River County, TX

• Trego County, KS

Remarks

         For identification, see:

• Hattin, D. E.  1982.  Stratigraphy and Depositional Environment of Smoky Hill Chalk Member, Niobrara Chalk (Upper Cretaceous) of the Type Area, Western Kansas.  Kansas University Geological Survey Bulletin 225.1–108 (great images!).