Usage:
Aldrich Mountains Group (OR*)
Subunits:
(alphabetical) --all in OR*: Fields Creek Formation, Keller Creek Shale, Laycock Graywacke, Murderers Creek Graywacke.
Geologic age:
Triassic, Late*
Jurassic, Early*
Type section, locality, area and/or origin of name:
Named from Aldrich Mountains, northeast OR. Because of lenticular nature of deposits no type section designated for group. Exposed on the south limb of Aldrlch Mountain anticline (Brown and Thayer, 1966a, USGS I-447). [See also individual formations of group.]
AAPG geologic province:
Blue Mountains 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 ([ ]).