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National Geologic Map Database

Geologic Unit: Phosphoria

Usage:

Phosphoria Formation (ID*,MT*,NV*,UT*,WY*)


Subunits:

(alphabetical): Ervay Tongue (WY*), Meade Peak Member (ID*,MT*,NV*,UT*,WY*) or Meade Peak Tongue (ID*,NV*,UT*), /Retort Phosphatic Shale Member (ID*,MT*,NV*,UT*,WY*) or Retort Tongue (ID*,MT*,UT*,WY*), Rex Chert Member (ID*,MT*,UT*,WY*) or Rex Tongue (UT*), Tosi Chert Member (ID*,MT*,UT*,WY*) or Tosi Tongue (ID*,MT*,UT*,WY*).


Geologic age:

Permian, Early*
Leonardian*
Roadian*
Guadalupian*
Wordian*


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

Not designated, but section measured in sec. 12, T. 10 S., R. 44 E., and in sec. 7, T. 10 S., R. 45 E, Bear Lake Co., ID. Named from Phosphoria Gulch, Bear Lake Co., UT (Richards and Mansfield, 1912).


AAPG geologic province:

Idaho Mountains province*
Montana folded belt*
Powder River basin
Wasatch uplift*
Snake River basin*
Denver basin
Green River basin*
Wind River basin*
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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).