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The succession of Paleocene mammals in Western Canada

Richard C. Fox
The succession of Paleocene mammals in Western Canada (in Dawn of the age of mammals in the northern part of the Rocky Mountain interior, North America, Thomas M. Bown (editor) and Kenneth D. Rose (editor))
Special Paper - Geological Society of America (1990) 243: 51-70


Although Paleocene mammals have been known from western Canada for nearly 70 years, only during the last 15 years have concerted efforts been made to discover, develop, and describe collections documenting their evolution. Whereas much remains to be done, a faunal succession has been reconstructed, based on collections from 41 mammalian local faunas in Alberta and Saskatchewan, ranging from early Puercan to late Tiffanian age (the first 8 to 10 m.y. of the Tertiary). Latest Cretaceous mammalian local faunas in Saskatchewan show that evolution of progressive "Paleocene aspect" mammals, including condylarths, had begun during the North American Cretaceous as evidenced by the occurrence of fossils in stratigraphie settings free from the complexities that make uncertain the age of faunally similar assemblages in Montana. The Ravenscrag Formation, southwestern Saskatchewan, yields the oldest (early Puercan) Tertiary mammals known from Canada (Rav W-l: MHBT Quarry, Pine Cree Park and Croc Pot localities), including the first discovery of the ancestral primate Purgatorius outside of eastern Montana, and the oldest unarguable carnivoran. Torrejonian mammals are known from the Coalspur Formation (Rocky Mountain Foothills; Diss locality) south of Edson, Alberta. Cochrane 2 (Porcupine Hills Formation, west of Calgary) has yielded unexpectedly diverse earliest Tiffanian mammals, and early Tiffanian mammals have recently been discovered in the Paskapoo Formation near Drumheller (Hand Hills West, lower level), and east of Innisfail, Alberta (Aaron"s Locality). Middle Tiffanian localities occur in the Paskapoo Formation near Red Deer (DW 1 to 3, Mel"s Place, Joffre Bridge Road Cut, Mammal Site No. 1, Erickson"s Landing), and in the Hand Hills (Hand Hills West, upper level); the Police Point local fauna (Ravenscrag Formation), Alberta, appears to be late middle or early late Tiffanian in age. Late Tiffanian mammals at Roche Percee, Saskatchewan (Ravenscrag Formation), and Canyon Ski Lodge, Crestomere School, and Swan Hills, Alberta (Paskapoo Formation) conclude the Paleocene mammalian record known from Canada. Species lists for each locality are presented. The early and middle Tiffanian mammalian record from Alberta fails to show a decline in species numbers seen at several American localities representing this interval: instead of the global cooling sometimes hypothesized to account for this decline, it now seems to be a result of biological or sedimentological events acting on a local scale, sampling error, or some combination of these factors.

ISSN: 0072-1077
EISSN: 2331-219X
Serial Title: Special Paper - Geological Society of America
Serial Volume: 243
Title: The succession of Paleocene mammals in Western Canada
Title: Dawn of the age of mammals in the northern part of the Rocky Mountain interior, North America
Author(s): Fox, Richard C.
Author(s): Bown, Thomas M.editor
Author(s): Rose, Kenneth D.editor
Affiliation: Univ. Alberta, Dep. Geol., Edmonton, AB, Canada
Affiliation: U. S. Geol. Surv., Denver, CO, United States
Pages: 51-70
Published: 1990
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 68
Accession Number: 1991-001988
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N51°28'00" - N51°28'00", W112°40'00" - W112°40'00"
N49°00'00" - N60°00'00", W110°00'00" - W101°19'60"
Secondary Affiliation: Johns Hopkins Univ., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography of Fossil Vertebrates, Society of Vertebrate Paleontology, Berkeley, CA, United States
Update Code: 1991
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