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National Geologic Map Database

Geologic Unit: Silvertip

Usage:

No current usage.
(Rocks of †Silvertip Conglomerate Member of Madison Limestone (MT-local) reallocated to Three Forks Formation. See Three Forks.)


Geologic age:

Late Devonian (Famennian); possibly Early Mississippian (Tournaisian; Kinderhookian)


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

Named from Silvertip syncline, because it is thickest on Lone Butte, [in T. 23 N., R. 13 W., Amphitheatre Mountain 7.5-min quadrangle, 1994 ed., Flathead Co.], which lies nearly in center of syncline. Is known only to occur in 3 areas --Lone Butte, Spotted Bear Mountain, and Pentagon Mountain, [west of Continental Divide in Flathead Co., northwestern MT] (Deiss, 1933).


AAPG geologic province:

Montana folded belt
North Western Overthrust
Sweetgrass arch


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 ([ ]).