USGS Mesozoic 22899, Model Dome (Cretaceous of the United States)

Where: Las Animas County, Colorado (37.5° N, 104.1° W: paleocoordinates 37.2° N, 67.0° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Sciponoceras gracile ammonoid zone, Bridge Creek Limestone Member (Greenhorn Formation), Late/Upper Cenomanian (99.6 - 93.5 Ma)

• Basal bed of the Bridge Creek Limestone Member of the Greenhorn Limestone. A very late Cenomanian age is indicated by the presence of the species Calycoceras naviculare and by the genus Pseudocalycoceras.

• bed-level stratigraphic resolution

Environment/lithology: lithified limestone

Size class: macrofossils

Collected by J.B. Reeside, H.R. Christner, W.A. Cobban; G.R. Scott, W.A. Cobban in 1950; 1966; reposited in the USNM

Primary reference: C. W. Cooke. 1953. American Upper Cretaceous Echinoidea. United States Geological Survey Professional Paper 254-A:1-44 [W. Kiessling/U. Merkel/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 78164: authorized by Wolfgang Kiessling, entered by Uta Merkel on 30.01.2008, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Echinoidea
 Holasteroida - Holasteridae
Holaster feralis Cooke 1953 sea urchin
Cephalopoda
 Ammonitida - Anisoceratidae
"Anisoceras plicatile" = Anisoceras plicatilis1
"Anisoceras plicatile" = Anisoceras plicatilis1 Sowerby 1819 ammonite
 Ammonitida - Baculitidae
Sciponoceras gracile1 Shumard 1860 ammonite
 Ammonitida - Acanthoceratidae
"Metoicoceras whitei" = Metoicoceras geslinianum1, "Kanabiceras septemseriatum" = Euomphaloceras septemseriatum1, Sumitomoceras conlini2, "Calycoceras naviculare" = Calycoceras (Calycoceras) naviculare1, "Pseudocalycoceras dentonense" = Pseudocalycoceras angolaense1, Eucalycoceras pentagonum2
"Metoicoceras whitei" = Metoicoceras geslinianum1 d'Orbigny 1841 ammonite
"Kanabiceras septemseriatum" = Euomphaloceras septemseriatum1 Cragin 1893 ammonite
Sumitomoceras conlini2 Wright and Kennedy 1981 ammonite
"Calycoceras naviculare" = Calycoceras (Calycoceras) naviculare1 Mantell 1822 ammonite
"Pseudocalycoceras dentonense" = Pseudocalycoceras angolaense1 Spath 1931 ammonite
Eucalycoceras pentagonum2 Jukes-Browne 1896 ammonite
 Ammonitida - Desmoceratidae
"Desmoceras (Moremanoceras) scotti" = Moremanoceras scotti1
"Desmoceras (Moremanoceras) scotti" = Moremanoceras scotti1 Moreman 1942 ammonite
Bivalvia
 Myalinida - Inoceramidae
"Inoceramus pictus" = Inoceramus (Inoceramus) pictus1
"Inoceramus pictus" = Inoceramus (Inoceramus) pictus1 Sowerby 1829 clam