Cokedale area (Cretaceous of the United States)

Where: Park County, Montana (45.6° N, 110.7° W: paleocoordinates 53.0° N, 77.4° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Cokedale Formation (Livingston Group), Campanian (83.6 - 72.1 Ma)

• "? Monoclonius sp." from a sandstone 710 above base of formation

• formation-level stratigraphic resolution

Environment/lithology: terrestrial; mudstone and argillaceous sandstone

• "The strata are characterized by poor sorting; angularity of grains; crossbedding; thick sequences in which mudstone and sandstone alternate; mudstone-pebble conglomerates; oxidized zones" "The sandstones are cemented mainly by silica, but the cement includes lesser amounts of calcite, zeolite minerals, and montmorillonite clay."

Size classes: macrofossils, mesofossils

Collected by G. E. Lewis in 1963

Primary reference: A. E. Roberts. 1972. Cretaceous and early Tertiary depositional and tectonic history of the Livingston area, southwestern Montana. United States Geological Survey Professional Paper 526-C:1-120 [J. Alroy/J. Alroy/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 167423: authorized by Matthew Carrano, entered by Matthew Carrano on 16.03.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
Plantae indet.
Plantae indet. Haeckel 1866
"wood and leaf debris"
Reptilia
 Dinosauria -
Dinosauria indet.
Dinosauria indet. dinosaur
"fragments of dinosaur bone"
 Ornithischia - Ceratopsidae
? Monoclonius sp.
? Monoclonius sp. Cope 1876 ceratopsid
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
Bivalvia
  -
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam