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

Journal Article · Sun Jun 01 04:00:00 EDT 1980 · Am. Assoc. Pet. Geol. Bull.; (United States)

OSTI ID:7090162

Shurr, G W

The Greenhorn Formation and Carlile Shale (Cenomanian and Turonian) crop out in western Minnesota near the town of Browns Valley. The locality (NE 1/4, NE 1/4, 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/sup 0/. The units are potential shallow, low-permeability gas reservoirs. 2 figures.

• Research Organization: Geological Survey, Denver, CO
• OSTI ID: 7090162
• Journal Information: Am. Assoc. Pet. Geol. Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol. Bull.; (United States) Vol. 64:6; ISSN AAPGB
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
030200* -- Natural Gas-- Reserves
Geology
& Exploration
CARBONATE ROCKS
CRETACEOUS PERIOD
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
GREAT LAKES REGION
LIMESTONE
LITHOLOGY
MESOZOIC ERA
MINERAL RESOURCES
MINNESOTA
NATURAL GAS DEPOSITS
NORTH AMERICA
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SHALES
STRATIGRAPHY
TECTONICS
USA