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National Geologic Map Database

Geologic Unit: Chappo

Usage:

Chappo Member of Wasatch Formation (WY*)


Geologic age:

late Paleocene to early Eocene*


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

Type area: near Hogsback Ridge, north of La Barge Creek, extends from Buckman Hollow eastward to exposures in Chappo Gulch, 1 mi southeast of Salli Mine. Named from Chappo Gulch (Oriel, 1962).
Type section (incomplete): Chappo Creek, in NE/4 sec. 17, T. 26 N., R. 113 W., Lincoln Co., southwestern WY (Oriel, 1962).
Reference section [incomplete]: Buckman Hollow, in sec. 12, T. 26 N., R. 114 W., Lincoln Co., southwestern WY (Oriel, 1962).


AAPG geologic province:

Green River 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 ([ ]).