north part, Sedan quadrangle (Cretaceous of the United States)

Where: Gallatin County, Montana (46.0° N, 110.9° W: paleocoordinates 53.4° N, 78.2° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Mudstone Member (Sedan Formation), Late/Upper Campanian (83.5 - 70.6 Ma)

• "Mudstone unit" that lies below the Lennep

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; mudstone

Size class: macrofossils

Collected by W. J. McMannis in 1971

Primary reference: B. Skipp and L. W. McGrew. 1972. The Upper Cretaceous Livingston Group of the western Crazy Mountains Basin, Montana. Montana Geological Society, 21st Annual Field Conference 99-106 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 167468: authorized by Matthew Carrano, entered by Matthew Carrano on 18.03.2015

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Fresh-water mollusks, wood, and dinosaur bones were recovered from several localities within this stratigraphic interval."
Show authors, comments, and common names
Reptilia
 Theropoda - Tyrannosauridae
cf. Gorgosaurus sp.
cf. Gorgosaurus sp. Lambe 1914 tyrannosaurid
femur