Search the DatabaseUse this page to search our collection of
educationally-useful geologic field guides and road logs in
Montana and Yellowstone. You may search the database by entering
a keyword to search or choosing one of the listed terms for
geologic topic, geographic location, or geologic province. Upper
Cretaceous-Paleocene Sequence, Bug Creek Area, Northeastern
Montana part of MT Field Guides Study of the Late Cretaceous-
Paleocene sequence in the Bug Creek Area and the rest of the
Fort Peck Fossil Field has contributed greatly to our
understanding of the paleoecology and stratigraphy of dinosaur
extinction and the primary radiation of Tertiary placental
mammals. The area features at least 133 species of spores and
pollen, 93 species of Cretaceous vertebrates (including 30
species of mammals and 19 species of dinosaurs), 24 species of
Paleocene mammals, as well as the oldest ungulate and primate
specimens ever found. Fossil leaves and wood have also been
described. The area also includes well-studied lo