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National Geologic Map Database

Geologic Unit: Delle

Usage:

Delle Phosphatic Member of Woodman Formation (NV*,UT*-notably in Deep Creek and South Lakeside Mountains)
Delle Phosphatic Member of Chainman Shale (NV*,UT*-notably in Needle Range)
Delle Phosphatic Member of Deseret Limestone (NV*,UT*-notably in Oquirrh Mountains)
Delle Phosphatic Member of Deep Creek Formation (ID*-notably in Deep Creek Mountains)
Delle Phosphatic Member of Little Flat Formation (UT*,ID*-notably in Chesterfield Range)
Delle Phosphatic Member of Aspen Range Formation (ID*-notably in Aspen Range)
Delle Phosphatic Member of Brazer Dolomite (WY*,UT*-notably in Crawford Mountains)


Geologic age:

Mississippian, Early*
Osagean*
Mississippian, Late*
Meramecian*


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

Type section: exposures along low ridge, south side Lakeside Mountains, in SE/4 SE/4 SW/4 sec. 6, T. 1 N., R. 8 W., Delle 7.5-min quadrangle, Tooele Co., UT. Named from town of Delle, UT (Sandberg and Gutschick, 1984).
Reference sections: (1) Ophir Canyon; (2) Dog Valley Peak, Pavant Range; and (3) Emma Canyon, Crawford Mountains (Sandberg and Gutschick, 1984).


AAPG geologic province:

Great Basin province*
Wasatch uplift*
Snake 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 ([ ]).