- Usage in publication:
-
- Elephant Hill breccia
- Modifications:
-
- Named
- Dominant lithology:
-
- Breccia
- AAPG geologic province:
-
- Los Angeles basin
- Transverse Ranges province
Summary:
Named as member of Glendora volcanics. Occurs in steep-walled semicircular valley head 500 ft in diameter that penetrates east flank of Elephant Hill, in Spadra area near Pomona, Los Angeles Co, CA. Breccia is composed of angular fragments of laminated gray spherulitic glass in tuffaceous matrix. Blocks range mostly from 1 inch or less across with largest 2 ft long. Underlies Puente formation. Age on map legend given as middle Miocene or older for Glendora volcanics.
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 ([ ]).