P3858 (Cretaceous of the United States)

Also known as Lance Formation, Wyoming

Where: Niobrara County, Wyoming (43.2° N, 104.6° W: paleocoordinates 47.9° N, 69.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

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

• member-level stratigraphic resolution

Environment/lithology: terrestrial; lithified, concretionary, gray siltstone and lithified, gray, sandy shale

• "large dull-gray siltstone concretions embedded in beds of lighter-gray, sandy shales"

Size class: mesofossils

Preservation: mold/impression, original carbon

Collection methods: bulk,

Primary reference: E. Dorf. 1942. Upper Cretaceous floras of the Rocky Mountain region; Flora of the Lance Formation at its type locality, Niobrara County, Wyoming. Contributions to Palaeontology [B. Tiffney/J. Fosdick/J. Fosdick]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 34970: authorized by Bruce Tiffney, entered by Julia Fosdick on 21.10.2003

Creative Commons license: CC BY (attribution)

Taxonomic list

 Equisetales - Equisetaceae
Equisetum sp. Linnaeus
 Typhales - Commelinidae
Typha sp. Linnaeus
 Polypodiales - Blechnaceae
 Rhamnales - Rosidae
Vitis stantoni grapevine
 Scrophulariales - Asteridae
 Magnoliales - Lauraceae
 Saxifragales - Cercidiphyllaceae
 Fagales - Fagaceae
 Ranunculales - Menispermaceae