- Usage in publication:
-
- Lakeview quartz-hornblende diorite
- Modifications:
-
- Named
- Dominant lithology:
-
- Quartz diorite
- AAPG geologic province:
-
- Peninsular Ranges province
Summary:
Occurs throughout greater portion of Lakeview Mountain, Riverside Co, CA. Recognized by its very coarse crystalline structure, white feldspar, abundant large quartz and large hornblende crystals. Intrudes Perris quartz diorite (new). Is younger than Estelle quartz diorite (new) and older than Steele Valley granodiorite (new). Map legend shows age as Late Jurassic(?).
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Lakeview tonalite
- Modifications:
-
- Redescribed
- Dominant lithology:
-
- Tonalite
- AAPG geologic province:
-
- Peninsular Ranges province
Summary:
Lakeview quartz-hornblende diorite of Dudley (1935) is redescribed as Lakeview tonalite. Distinguished by very white feldspar and abundant, generally euhedral, hornblende which exceeds biotite. Has prominent flow lines produced by parallel orientation of feldspar and hornblende crystals and streaked dark inclusions. Geologic sketch map shows unit surrounds Green Valley tonalite in ring having average width of one mi. Along west edge are small gabbro bodies and Bonsall tonalite. To the east and north are Julian schist and Stonewall tonalite of Triassic(?) age. Age of Lakeview tonalite given as Jurassic(?).
Source: GNU records (USGS DDS-6; Menlo GNULEX).
- Usage in publication:
-
- Lakeview tonalite
- Modifications:
-
- Not used
- AAPG geologic province:
-
- Peninsular Ranges province
Summary:
Names Lakeview quartz-hornblende diorite of Dudley (1935) and Lakeview tonalite of Merriam (1941) are replaced by name Lakeview Mountain tonalite because of prior use of name Lakeview. Age of Lakeview Mountain tonalite 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 ([ ]).