- Usage in publication:
-
- Alpine quartz diorite
- Modifications:
-
- Original reference
- AAPG geologic province:
-
- Capistrano basin
- Salton basin
Summary:
Pg. 115-141, map. Alpine quartz diorite. Usually of more uniform composition, color, texture, and structure than Viejas gabbro diorite, although of about same age. Cuts Black Mountain volcanics. Age is Late Jurassic or Early Cretaceous.
Typical occurrence in general vicinity of Alpine, southern Peninsular Range, San Diego and Imperial Cos., southern CA.
Source: US geologic names lexicon (USGS Bull. 896, p. 37).
- Usage in publication:
-
- Alpine quartz diorite
- Modifications:
-
- Areal extent
- AAPG geologic province:
-
- Capistrano basin
Summary:
Pg. 486, Table 4. Alpine quartz diorite. Plutonic sequence in southern San Diego County, southern California, comprises (ascending) Viejas gabbro-diorite, Alpine quartz diorite, Harbison quartz diorite, Descanso granodiorite, and La Posta quartz diorite. Age is late Mesozoic [Late Jurassic or Early Cretaceous].
Source: US geologic names lexicon (USGS Bull. 1200, p. 63).
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 ([ ]).