USGS Loc. M11694, Vermilion Creek [Mancos Shale] (Cretaceous of the United States)

Where: Moffat County, Wyoming (40.8° N, 108.9° W: paleocoordinates 44.6° N, 73.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Baculites asper ammonoid zone, Mancos Shale Formation, Middle Coniacian (89.3 - 85.8 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 Coniacian on the basis of ammonoid and bivalve biostratigraphy (by enterer). STRATIGRAPHIC POSITION: From top of Vermilion Creek section, at 1645 ft above base of section.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, gray 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 87773: 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.
Lingulata
 Lingulida - Lingulidae
Lingula aff. nitida Meek and Hayden 1861
Bivalvia
 Arcida - Arcidae
"Arca" sp. Linnaeus 1758 ark
 Myalinida - Inoceramidae
"Inoceramus stantoni" = Mytiloides stantoni Sokolow 1914 clam
 Ostreida - Ostreidae
Ostrea congesta Conrad 1843 oyster
 Lucinida - Lucinidae
 Nuculida - Nuculidae
Nucula sp. Lamarck 1799 nut clam
 Protobranchia - Yoldiidae
Gastropoda
 Stromboidea - Strombidae
""Fusus" sp." = Rostellaria (Fusus)
""Fusus" sp." = Rostellaria (Fusus) Bruguière 1789 true conch
 Stromboidea - Aporrhaidae
? Anchura sp. Conrad 1860 snail
 Basommatophora - Siphonariidae
Anisomyon sp. Meek and Hayden 1860 pulmonate
Cephalopoda
 Ammonitida - Baculitidae
Baculites asper Morton 1830 ammonite