U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS

National Geologic Map Database

NGMDB

Geologic Unit: Morrison

Usage:

Morrison Formation (AZ*,CO*,KS,MT*,NE,NM*,ND*,OK*,SD*,TX,UT*,WY*)


Subunits:

(alphabetical): Casamero Member (NM), Bluff Sandstone Member (AZ*,CO,NM*,UT*), Brushy Basin Member (AZ*,CO*,NM*,UT*), Bullington Member (NM), Chavez Member (UT*), Fiftymile Member (UT*), Jackpile Sandstone Member (NM*), Prewitt Sandstone Member (NM), Recapture Member (AZ*,CO*,NM*,UT*), Salt Wash Member (AZ*,CO*,NM*,UT*), Stockett Bed (MT), Tidwell Member (AZ*,CO*,NM*,UT*), Unkpapa Sandstone Member (SD*), Westwater Canyon Member (AZ*,CO*,NM*,UT*).


Geologic age:

Late Jurassic*; locally Early Cretaceous*


Type section, locality, area and/or origin of name:

Named from exposures near town of Morrison, Jefferson Co., CO (Eldridge, 1896).
Type locality: Morrison, Jefferson Co., CO.
Type section: along north side of West Alameda Parkway roadcut, 2 mi north of town of Morrison, in SE/4 sec. 23, T. 4 S., R. 70 W., [approx. Lat. 39 deg. 41 min. 08 sec. N., Long. 105 deg. 11 min. 06 sec. W., Morrison 7.5-min quadrangle], Jefferson Co., CO (Waldschmidt and LeRoy, 1944).


AAPG geologic province:

Anadarko basin*
Bighorn basin*
Black Mesa basin*
Central Montana uplift*
Chadron arch*
Denver basin*
Green River basin*
Las Vegas-Raton basin*
Montana folded belt*
North Park basin*
Orogrande basin*
Palo Duro basin*
Paradox basin*
Piceance basin*
Plateau sedimentary province*
Powder River basin*
San Juan basin*
San Luis basin*
Sierra Grande uplift*
Sweetgrass arch*
Uinta basin*
Wasatch uplift*
Williston basin*


NGMDB

For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).

Find Us:

twitter

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
URL: http://ngmdb.usgs.gov
Page Contact Information: Personnel
Page Last Modified: Tue Jun 3 17:20:15 2014