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Acanthoceras granerosense

Geological Range

AWAITING DETERMINATION.

Acanthoceras granerosense Zone: Middle Cenomanian 95.73 ± 0.61 to 94.96 ± 0.50

Paleogeographic Distribution

Southeastern Colorado (Cobban and Scott, 1973).

Remarks

Original presentation: Acanthoceras granerosense

Original publication: Cobban and Scott. 1973. Stratigraphy and ammonite fauna of the Graneros Shale and Greenhorn Limestone near Pueblo, Colorado. USGS Professional Paper 645. [p. 68-70, pl. 2, figs 1-4, pl. 4, fig. 2, pl. 5, fig. 3, pl. 6, figs. 1-3, text figs 29, 30].

Holotype: USNM 163953. Access Smithsonian NMNH specimen record here.

Type locality: USGS locality D5291, Pueblo County, Colorado.

Type horizon: Graneros Shale, “9 feet above the Thatcher Limestone Member” (Cobban and Scott, 1973, pl. 6, figs 1, 2 caption).

Zonation: Acanthoceras granerosense zone = Middle Cenomanian (94.96 +/- 0.50 Ma) (Cobban et al., 2006).

Synonyms: none known.

References: Cobban and Scott (1973).

Stratigraphic Occurrences

Cenomanian
Graneros Shale (CO)
Holotype of <i>Acanthoceras granerosense</i> (USNM 163953) from the Middle Cenomanian Graneros Shale of Pueblo County, Colorado. Original unmodified image provided by courtesy of the Smithsonian NMNH and adapted and presented here under a Creative Commons BY-NC 4.0 license (NMNH GUID ark:/65665/3236890b5-76f5-4069-999c-379e65e7219e).
Holotype of Acanthoceras granerosense (USNM 163953) from the Middle Cenomanian Graneros Shale of Pueblo County, Colorado. Original unmodified image provided by courtesy of the Smithsonian NMNH and adapted and presented here under a Creative Commons BY-NC 4.0 license (NMNH GUID ark:/65665/3236890b5-76f5-4069-999c-379e65e7219e).
Specimens of <i>Acanthoceras granerosense</i>. Images modified from Cobban and Scott (1973 in USGS PP 645; plates 4 and 6); attained from BHL under a CC BY-NC-SA 4.0 license.
Specimens of Acanthoceras granerosense. Images modified from Cobban and Scott (1973 in USGS PP 645; plates 4 and 6); attained from BHL under a CC BY-NC-SA 4.0 license.
Whorl section of <i>Acanthoceras granerosense</i>. Images modified from Cobban and Scott (1973 in USGS PP 645; text-figs 29 and 30); attained from BHL under a CC BY-NC-SA 4.0 license.
Whorl section of Acanthoceras granerosense. Images modified from Cobban and Scott (1973 in USGS PP 645; text-figs 29 and 30); attained from BHL under a CC BY-NC-SA 4.0 license.

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