- Usage in publication:
-
- Palmer Mountain Greenstone*
- Modifications:
-
- Named
- Dominant lithology:
-
- Greenstone
- Diabase
- AAPG geologic province:
-
- Okanogan province
Summary:
Named for Palmer Mountain. Type locality designated as bluffs at northeast margin at common corner of secs. 16,17,20,21 T39N R26E, central Loomis 15' quad, Okanogan Co, WA. Consists of metamorphosed assemblage of basaltic extrusive and shallow intrusive rocks that commonly vary from greenstone to diabase. Approximate minimum thickness is 7,000 ft. Basal pyroclastic rocks of unit depositionally overlie Bullfrog Mountain Formation (new). Appears to be locally overlain by Kobau Formation (new), but also locally appears in part intrusive into Kobau. Assigned Permian or Triassic age based on lithologic and stratigraphic similarity to Old Tom Formation (Bostock, 1940) in southern British Columbia.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
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 ([ ]).