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Southern California Geology

Geologic Setting of the San Gabriel Mountains, Transverse Ranges Province

Geologic Structures

Punchbowl Fault

The Punchbowl Fault zone, located just south of the San Andreas Fault in the eastern San Gabriel Mountains, is a deformed early strand of the San Andreas Fault (Barrows, 1975, 1979, 1980, 1987; Barrows and others, 1976, 1985, 1987; Weldon and others, 1993; Matti and others, 1993). It consists of two closely spaced faults separated at most places by a sliver of intensely deformed tonalitic and gneissic rocks (fig. 3 of Matti and others, 1992a). In some places recognizable gneiss and tonalite is missing and the two metamorphic facies of the Pelona Schist are separated by thoroughly sheared basement rock of uncertain parentage. For more detail, see the discussion of the Punchbowl Fault by Matti and others (1992a).


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This site last updated September 3, 2004 (ps)

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