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GEOREF RECORD

Pleistocene niche glaciers and proto-cirques, Cataract Creek valley, Tobacco Root Mountains, Montana

Alan M. Jacobs
Pleistocene niche glaciers and proto-cirques, Cataract Creek valley, Tobacco Root Mountains, Montana (in United States contributions to Quaternary research--Internat. Assoc. Quaternary Research, 8th Cong., Paris, 1969)
Special Paper - Geological Society of America (1969) 123: 103-114

Abstract

Two moraines were deposited by Pleistocene niche or slab glaciers that emanated from poorly developed cirques along the valley sides rather than by valley glaciers that emanated from well-formed cirques at elevations of >9000 feet. Niche or slab glaciers were formed in hollows at elevations of <8000 feet because hollows were hemmed in and orographically influenced by valley glaciers on the south and east and by the main mountain diviide on the north and west. The two valley glaciers generated a locally cold microclimate in the hollows, which were well-situated for accumulation of snow drifting across the nearby divide. The fortuitous position of these hollows during late Pleistocene resulted in incipient glacier formation at elevations lower than would be expected.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 123
Title: Pleistocene niche glaciers and proto-cirques, Cataract Creek valley, Tobacco Root Mountains, Montana
Title: United States contributions to Quaternary research--Internat. Assoc. Quaternary Research, 8th Cong., Paris, 1969
Author(s): Jacobs, Alan M.
Pages: 103-114
Published: 1969
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1969-032659
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus., table
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1969
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