Upper Cretaceous–Paleocene biostratigraphy and magnetostratigraphy, Hell Creek and Tullock Formations, northeastern Montana

Research Article| March 01, 1982 Upper Cretaceous–Paleocene biostratigraphy and magnetostratigraphy, Hell Creek and Tullock Formations, northeastern Montana J. David Archibald; J. David Archibald 1Department of Biology and Peabody Museum of Natural History, Yale University, New Haven, Connecticut 06520 Search for other works by this author on: GSW Google Scholar Robert F. Butler; Robert F. Butler 2Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Scholar Everett H. Lindsay; Everett H. Lindsay 2Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Scholar William A. Clemens; William A. Clemens 3Museum of Paleontology, University of California, Berkeley, California 94720 Search for other works by this author on: GSW Google Scholar Lowell Dingus Lowell Dingus 3Museum of Paleontology, University of California, Berkeley, California 94720 Search for other works by this author on: GSW Google Scholar Geology (1982) 10 (3): 153–159. https://doi.org/10.1130/0091-7613(1982)10<153:UCBAMH>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation J. David Archibald, Robert F. Butler, Everett H. Lindsay, William A. Clemens, Lowell Dingus; Upper Cretaceous–Paleocene biostratigraphy and magnetostratigraphy, Hell Creek and Tullock Formations, northeastern Montana. Geology 1982;; 10 (3): 153–159. doi: https://doi.org/10.1130/0091-7613(1982)10<153:UCBAMH>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Fossils from the Hell Creek and Tullock Formations in northeastern Montana provide detailed documentation of terrestrial faunal and floral evolution during latest Cretaceous (Lancian) and early Paleocene (Puercan) time. Here the replacement of Lancian faunas by those of Puercan age, most obviously signaled by the extinction of dinosaurs, and the changes in pollen floras sometimes used to mark the Cretaceous-Tertiary boundary occurred during a period of reversed magnetic polarity. Paleontological correlations suggest that dinosaur extinction and the change in pollen floras took place in the Red Deer Valley area, Alberta, during the same period of reversed polarity. Furthermore, also on the basis of paleontological correlations, the extinction of dinosaurs in the San Juan Basin, New Mexico, appears to have occurred either during the same period of reversed polarity or, possibly, during the preceding period of normal polarity. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.