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Subsurface exploration of two landslides in southern California yielded carbonized wood fragments below the slide masses. One slide, just east of the active Portuguese Bend slide in Palos Verdes Hills, Los Angeles County, in rocks of the Altamira Member of the Miocene Monterey Formation, overran alluvium containing wood fragments; the radiocarbon age of the wood is 2915 ± 205 years B.P. The slide mass and scarp show minor erosion with rills and channels about 3 feet deep, and at least 25 feet of clay and silt have been deposited in the tension cracks at the head of the slide. The...

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