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National Geologic Map Database

Geologic Unit: Opohonga

Usage:

Opohonga Limestone (UT*)


Geologic age:

Early Ordovician*


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

Not designated. Named from Opohonga Mine, in T. 10 S., R. 2 W., Utah Co., UT. Exposed from northern boundary of Tintic mining district southward to Mammoth [Eureka 7.5-min quadrangle], Juab and Utah Cos., UT (Loughlin, IN Lindgren and Loughlin, 1919).


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 ([ ]).