Summary: Geological Society of America
Special Paper 361
2002
191
Mammals from the end of the age of dinosaurs in North Dakota
and southeastern Montana, with a reappraisal of geographic
differentiation among Lancian mammals
John P. Hunter*
Department of Anatomy, New York College of Osteopathic Medicine of New York Institute of Technology,
Old Westbury, New York 11568, USA
J. David Archibald*
Department of Biology, San Diego State University, San Diego, California 92182, USA
ABSTRACT
An end-Cretaceous nonavian dinosaur extinction and an early Paleocene mam-
malian radiation is documented primarily in stratigraphic sequences in eastern Mon-
tana. To determine how representative these sequences are, we extended investigation
of this Cretaceous-Tertiary (K-T) transition to new areas. Studies in southwestern
North Dakota and southeastern Montana provide new records of mammals through
the last 1.32­1.68 million years of the Cretaceous and extending into the Paleocene,
allowing us to evaluate mammalian faunal differentiation across the geographic land-

Source: Archibald, J. David - Department of Biology, San Diego State University

Collections: Biology and Medicine; Geosciences