ammonites
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Gateway to the Paleobiology Database
Cedaredge (Cretaceous of the United States)

Where: Delta County, Colorado (38.9° N, 107.9° W: paleocoordinates 46.0° N, 78.2° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Scaphites hippocrepis zone, Prairie Canyon Member (Mancos Shale Formation), Early/Lower Campanian (84.9 - 70.6 Ma)

• bed-level stratigraphic resolution

Environment/lithology: offshore; gray, argillaceous, calcareous siltstone

• "off-shore deposit in relatively deep, quiet water... open marine shelf"

"Numerous casts and internal molds of bivalves... calcareous concretions containing [ammonites]" plus shark teeth and mosasaur skeleton

• thinly laminated, dark gray siltstone

Size class: macrofossils

Preservation: cast, concretion

Collected by J. A. Jensen in 1979

• all material was found in association with a mosasaur skeleton

Primary reference: J. A. Jensen. 1987. New brachiosaur material from the Late Jurassic of Utah and Colorado. Great Britain Naturalist 47(4):592-608 [M. Carrano/M. Oreska] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 5607: authorized by John Alroy, entered by John Alroy on 31.10.1999

Creative Commons license: CC BY (attribution)