Usage:
Chainman Shale (CA*,NV*,UT*)
Chainman Formation (NV*)
Subunits:
(descending): Delle Phosphatic Member (NV*,UT*), Jensen Member (UT), Needle Siltstone Member (UT*), Scotty Wash Member (NV), Skunk Spring Limestone Bed (UT*), Willow Gap Member (UT).
Geologic age:
Mississippian, Early*
Osagean*
Mississippian, Late*
Meramecian*
Chesterian*
Type section, locality, area and/or origin of name:
Named from the Chainman Mine, near Lane, Ely quadrangle, White Pine Co., eastern NV (Spencer, 1917).
Type section: Robinson Canyon, 2 mi west of Ely, Egan Range, [Ely quadrangle, White Pine Co., eastern NV] (GNC index card files).
AAPG geologic province:
Great Basin 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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).