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National Geologic Map Database

Geologic Unit: Maywood

Usage:

Maywood Formation (MT*,WY*)


Geologic age:

late Middle to early Late Devonian (Givetian to Frasnian)*


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

Named from Maywood Ridge, west of Princeton, on whose northeastern face, 2 mi above mouth of South Boulder Creek, the best exposure occurs, [in T. 8 N., R. 13 W., Philipsburg quadrangle, Granite Co.], central western MT (Emmons and Calkins, 1913).


AAPG geologic province:

Montana folded belt*
Sweetgrass arch*
Yellowstone 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 ([ ]).