- Usage in publication:
-
- Leidy Adamellite
- Modifications:
-
- Named
- Dominant lithology:
-
- Quartz monzonite
- AAPG geologic province:
-
- Sierra Nevada province
Summary:
[Probably named for Leidy Creek, Mt. Barcroft 15' quad, CA] Underlies approximately 3 sq mi of quad in Inyo batholith. Is fine-grained rock which is most leucocratic pluton of Mt. Barcroft quad. Surrounded by older rocks: on south by Cabin Granodiorite (new), on east and west by sedimentary rocks, and to north by a complex of granitic rocks, contaminated by numerous inclusions. The four adamellites --Leidy, Sage Hen, Cottonwood, and McAfee (all new) --in area correspond to Boundary Peak Granite (Anderson, 1937).
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Leidy Adamellite
- Modifications:
-
- Not used
- Geochronologic dating
- AAPG geologic province:
-
- Sierra Nevada province
Summary:
K-Ar determination on biotite from Leidy pluton yielded age of 73.8 +/-2 Ma. Unit also referred to as "quartz monzonite of Leidy Creek" on geologic sketch map of White Mountains area. Age is shown as Cretaceous.
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 ([ ]).