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National Geologic Map Database

Geologic Unit: Telegraph Creek

Usage:

Telegraph Creek Beds of Gammon Member of Cody Shale (northwestern Powder River basin of MT*,WY*)
Telegraph Creek Member of Cody Shale (MT*,WY)
Telegraph Creek Member of Colorado Shale (MT)
Telegraph Creek Formation (MT*)
Telegraph Creek Formation of Montana Group (MT*)


Subunits:

(alphabetical): Elk Basin Sandstone Member (MT*,WY*).


Geologic age:

Late Cretaceous (Santonian to Campanian)*


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

Typically developed at head of Telegraph Creek, in T. 2 S., R. 28 and 29 E., Crow Indian Reservation, Yellowstone Co., central southern MT (Thom, 1923).


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 ([ ]).