USGS Loc. M11672, Vermilion Creek [Mancos Shale] (Cretaceous to of the United States)

Where: Moffat County, Wyoming (40.8° N, 108.9° W: paleocoordinates 43.8° N, 73.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Mancos Shale Formation, Turonian to Turonian (93.9 - 86.3 Ma)

• STRATIGRAPHIC RELATIONS: From the Mancos Fm, which overlies the Dakota Sandstone, and is overlain by the Iles Fm of the Mesaverde Group. AGE: Albian-Coniacian for entire formation. Here assigned to Turonian-Coniacian on the basis of ammonoid and bivalve biostratigraphy (by enterer). STRATIGRAPHIC POSITION: From top of Vermilion Creek section, at 875 ft above base of section.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, gray, blue shale

• ENVIRONMENT: Marine siliciclastic.
• SPECIFIC LITHOLOGY: Light bluish-gray shale, laminated, breaking into flat pieces when fresh. LITHIFICATION: Lithified, on the basis of facies description.

Size class: macrofossils

Preservation: cast, mold/impression

Collected by Reeside; reposited in the USNM

Collection methods: surface (in situ),

• COLLECTOR: J. B. Reeside. REPOSITORY: Presumably USNM of USGS.

Primary reference: J. B. Reeside. 1955. Revised interpretation of the Cretaceous section on Vermilion Creek, Moffat County, Colorado. Wyoming Geological Association Guidebook - 1955 85-88 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 87757: authorized by Austin Hendy, entered by Austin Hendy on 24.03.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for marine invertebrate groups. NOMENCLATURE: Not an authoritative publication, with relatively antiquated nomenclature, but species-resolution identifications.
Nodosariata
 Nodosariida - Nodosariidae
Nodosaria sp. Lamarck 1812
Cephalopoda
 Ammonitida - Baculitidae
Baculites mariasensis Cobban 1951 ammonite
 Ammonitida - Anisoceratidae
Anisoceras sp. Pictet 1854 ammonite
 Ammonitida - Placenticeratidae
Gastropoda
 Cerithioidea - Cerithiidae
? Cerithium sp. Bruguière 1789 cerith snail
 Sorbeoconcha - Naticidae
? Lunatia sp. Gray 1847 moon snail
 Sorbeoconcha - Aporrhaidae
? Anchura sp. Conrad 1860 snail
Bivalvia
 Lucinida - Lucinidae
Lucina sp. Bruguière 1797 clam
 Cardiida - Mactridae
Mactra emmonsi Meek 1877 clam
 Myalinida - Inoceramidae
"Inoceramus subquadratus" = Magadiceramus subquadratus Schlüter 1887 clam
 Ostreida - Ostreidae
Ostrea congesta Conrad 1843 oyster