Upper Frontier Formation - Fremont County (Cretaceous of the United States)

Where: Fremont County, Wyoming (42.8° N, 108.7° W: paleocoordinates 48.5° N, 74.2° W)

• coordinate based on nearby landmark

When: Frontier Formation, Late/Upper Cretaceous (100.5 - 66.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: deltaic

• "the Frontier Fromation in Fremont county varies in its lithology from a coarse friable massive grayish sandstone to a finer more or less brownish or yellowish sandstone with a considerable intermixture of mudstone."

Size class: macrofossils

Preservation: mold/impression, adpression, original carbon

Collection methods: For further modifications, see Crabtree, D.R. 1987. Angiosperms of the Northern Rocky Mountains: Albian to Campanian (Cretaceous) Megafossil floras. Ann. Missouri Bot. Gard. 74: 707-747.

Primary reference: E.W. Berry. 1929. The flora of the Frontier Formation. United States Geological Survey Professional Paper 158:129-135 [B. Tiffney/J. Fosdick/J. Fosdick]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 31383: authorized by Bruce Tiffney, entered by Julia Fosdick on 11.05.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Phyllites
  -
Phyllites grandifolius-cretaceous, Phyllites cretaceous, Phyllites crassipes
 Coniferales - Cupressaceae
Sequoia reichenbachi
Sequoia reichenbachi Heer 1868 coast redwood
Pinopsida
 Pinales - Taxaceae
Protophyllocladus subintegrifolius
Angiospermae
 Rosids - Moraceae
Ficus inaequalis
Ficus inaequalis Lesquereux 1891 fig
 Fagales - Nothofagaceae
Dryophyllum lanceolatum
 Malvales - Malvaceae
Sterculia towneri
Sterculia towneri tropical chestnut
Cycadopsida
 Cycadales -
Nilsonia mehli