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GEOREF RECORD

Exposures of Greenhorn Formation and Carlile Shale (Upper Cretaceous) at Lake Traverse, western Minnesota

George W. Shurr
Exposures of Greenhorn Formation and Carlile Shale (Upper Cretaceous) at Lake Traverse, western Minnesota
AAPG Bulletin (June 1980) 64 (6): 942-945

Abstract

The Greenhorn Formation and Carlile Shale (Cenomanian and Turonian) crop out in western Minnesota near the town of Browns Valley. The locality (NE1/4, NE1/4, Sec. 2, T125N, R49W) provides important lithologic and biostratigraphic data because it is situated in an area of sparse outcrop. About 3 m of chalk and limestone are assigned to the Greenhorn; Mytiloides labiatus (Schlotheim) and Watinoceras coloradoense (Henderson) are present in the unit. The Carlile Shale is approximately 35 m thick and includes the Fairport, Blue Hill, Codell Sandstone, and upper unnamed members. Collignoniceras woollgari (Mantel) is present in the Blue Hill Member. The Greenhorn Formation and Carlile Shale were deposited in shallow marine environments on the eastern margin of the Late Cretaceous seaway. Postdepositional tectonism is suggested by an observed dip of 27 degrees . The units are potential shallow, low-permeability gas reservoirs.


ISSN: 0149-1423
EISSN: 1558-9153
Coden: AABUD2
Serial Title: AAPG Bulletin
Serial Volume: 64
Serial Issue: 6
Title: Exposures of Greenhorn Formation and Carlile Shale (Upper Cretaceous) at Lake Traverse, western Minnesota
Author(s): Shurr, George W.
Affiliation: U. S. Geol. Surv., Denver, Colo., United States
Pages: 942-945
Published: 198006
Text Language: English
Publisher: American Association of Petroleum Geologists, Tulsa, OK, United States
References: 17
Accession Number: 1981-010571
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N45°34'60" - N46°00'00", W96°49'60" - W96°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute.
Update Code: 1981
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