Elephant Hill Breccia [Member] of Glendora Volcanics (CA)
Tertiary
Miocene, middle or older
Not stated. Occurs in steep-walled semicircular valley head, 500 ft in diameter, that penetrates east flank of Elephant Hill near Pomona, Los Angeles Co., CA (Shelton, 1955).
Los Angeles basin
Transverse Ranges province
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