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National Geologic Map Database

Geologic Unit: Yogo

Usage:

Yogo Limestone (MT*)


Geologic age:

early Late Devonian (Frasnian; Senecan Provincial Epoch)


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

Origin of name not stated, but Barker formation is mapped at and around village of Yogo, also along Yogo Creek (both in north part of Little Belt Mountains quadrangle, MT), at both of which places it is overlain by Jefferson limestone (Weed, 1899b).
Type locality: in northeast corner of Three Forks quadrangle, MT (Weed, 1900).


AAPG geologic province:

Central Montana uplift
Montana folded belt*
Sweetgrass arch*
Williston basin


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 ([ ]).