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Borissiakoceras orbiculatum

Geological Range

Cenomanian

Paleogeographic Distribution

Texas to Montana

Remarks

Original presentation: Borissiakoceras orbiculatum

Original publication: Stephenson. 1955. [p. 64, pl. 6, figs 1-4].

Holotype: USNM 108832.

Type locality: near Mansfield, Texas (Kennedy and Cobban, 1990a).

Type horizon: “basal Eagle Ford Group” (Kennedy and Cobban, 1990a, p. 85).

Other specimens: USNM 420185-420194.

PaleoDB taxon number: 333410.

References: Kennedy and Cobban (1990a).

Stratigraphic Occurrences

Cenomanian
Acanthoceras amphibolum zone (CO)
Acanthoceras amphibolum zone (KS)
Acanthoceras amphibolum zone (TX)
Acanthoceras amphibolum zone (WY)
Belle Fourche Formation (WY)
Britton Formation (TX)
Eagle Ford Group (basal) (TX)
Frontier Formation (WY)
Graneros Shale (CO)
Greenhorn Limestone (KS)
Greenhorn Limestone (Lincoln Shale Member) (KS)
Greenhorn Limestone (WY)
Lake Waco Formation (TX)
Lake Waco Formation (Bluebonnet Member) (TX)
Sciponoceras gracile zone (TX)
Specimens of <i>Borissiakoceras orbiculatum</i> from the Eagle Ford Group (basal) of Johnson County, Texas. See original caption for additional details. Image modified from pl. 1, figs 1-14 in Kennedy and Cobban (1990a in <i>Palaeontology</i>), made available through Biodiversity Heritage Library via a CC BY-NC-SA 4.0 license.
Specimens of Borissiakoceras orbiculatum from the Eagle Ford Group (basal) of Johnson County, Texas. See original caption for additional details. Image modified from pl. 1, figs 1-14 in Kennedy and Cobban (1990a in Palaeontology), made available through Biodiversity Heritage Library via a CC BY-NC-SA 4.0 license.

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