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GEOREF RECORD

Evolution of the northern Cordilleran foreland basin during the Middle Cretaceous

Yongtai Yang and Andrew D. Miall
Evolution of the northern Cordilleran foreland basin during the Middle Cretaceous
Geological Society of America Bulletin (March 2009) 121 (3-4): 483-501

Abstract

A detailed study of the middle-late Cenomanian Belle Fourche Formation in southern Alberta helps to elucidate the evolution of the Cordilleran foreland basin during the middle Cretaceous. By combining isopach data from the study area with previously published research on middle Cretaceous stratigraphy in adjacent areas of northern Alberta and Montana, it is possible to define the position of the proximal foredeep, fore-bulge, and backbulge depozones from late Albian to Cenomanian time. The foredeep probably lay to the west of the present fold-thrust belt in western Montana from the late Albian to middle Cenomanian, with the forebulge extending northwestward through the northwest corner of Wyoming and curving northeastward through the present-day location of Calgary. Thick Dunvegan deposits (middle Cenomanian) of northwestern Alberta are interpreted as foredeep deposits. Palinspastic reconstruction of the southern Rocky Mountains of Alberta is consistent with a location of the foredeep within the area of the present fold-thrust belt. At the end of the middle Cenomanian the forebulge retreated westward within Alberta, defining a nearly straight northwest-southeast trend through the present position of the Foothills and Front Ranges of Alberta and northwestern Montana. The change in trend of the foreland basin at the end of the middle Cenomanian may reflect the change of convergence vectors along the western margin of North America during the middle Cretaceous.


ISSN: 0016-7606
EISSN: 1943-2674
Coden: BUGMAF
Serial Title: Geological Society of America Bulletin
Serial Volume: 121
Serial Issue: 3-4
Title: Evolution of the northern Cordilleran foreland basin during the Middle Cretaceous
Affiliation: University of Toronto, Department of Geology, Toronto, ON, Canada
Pages: 483-501
Published: 200903
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 68
Accession Number: 2009-028238
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., sketch maps
N49°00'00" - N51°00'00", W114°00'00" - W110°00'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200916
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