- Usage in publication:
-
- Sheep Bay granite*
- Modifications:
-
- Named
- Dominant lithology:
-
- Granite
- AAPG geologic province:
-
- Alaska Southern region
Summary:
Occupies northeast third of point of land separating Port Gravina from Sheep Bay, eastern part of Prince William Sound, southern AK. Is coarsest-grained granite of the sound. Is light gray in color. Intrudes fine-grained baked graywacke of Orca group. [Age is Mesozoic(?)].
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Sheep Bay Granite*
- Modifications:
-
- Age modified
- Geochronologic dating
- AAPG geologic province:
-
- Alaska Southern region
Summary:
K-Ar age on biotite yielded 51.9 Ma and on hornblende, 41.3 Ma (Plafker, George, oral commun., 1977). Age is Eocene(?) [on basis of correlation with Cedar Bay Granite which is chemically similar to Sheep Bay Granite.]
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 ([ ]).