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National Geologic Map Database

Geologic Unit: Jack Valley

Usage:

Jack Valley Member of Laketown Dolomite (NV,UT)
Jack Valley Member of Laketown Dolostone (UT)


Geologic age:

late Early Silurian (Wenlock)


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

Notable exposures on west side of Jack Valley, in sec. 25, T. 21 S., R. 15 W., [Pyramid Knoll 7.5-min quadrangle], Confusion Range, Millard Co., western UT (Rush, 1956).


AAPG geologic province:

Wasatch uplift
Great Basin province


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 ([ ]).