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National Geologic Map Database

Geologic Unit: Spence

Usage:

Spence Tongue of Lead Bell Shale (ID*,UT*)
Spence Shale Member of Langston Dolomite (ID,UT)
Spence Shale Member of Langston Formation (UT)


Geologic age:

Middle Cambrian*


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

Type locality: Spence Gulch, a ravine running up into Danish Flat from Mill Canyon, about 5 mi west-southwest of Liberty, Bear Lake Co., southeastern ID (Walcott, 1908).


AAPG geologic province:

Wasatch uplift*


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

Asterisk (*) indicates published by U.S. Geological Survey authors.

"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 ([ ]).