Peridotite clasts in fanglomerate on the west margin of the Chiwaukum graben have rims of serpentine (lizardite) that formed after deposition. Interbedded sedimentary rocks are incompletely altered to laumontite and other low P-T phases. Serpentinization must have occurred under P-T conditions no higher than zeolite facies, probably less than 100°C.

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