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National Geologic Map Database

Geologic Unit: Great Blue

Usage:

Great Blue Limestone (ID*,UT*)
Great Blue Formation (UT*)


Subunits:

(alphabetical): Chiulos Shale Member (UT*), Long Trail Shale Member (UT*), Paymaster Member (UT*), Poker Knoll Limestone Member (UT*), Topliff Limestone Member (UT*).


Geologic age:

Mississippian, Late*


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

Named by miners; name retained because of its widespread use, even though no type locality designated and name Great Blue has no geographic significance (Gilluly, 1932).


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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).