The Yaqui Flat landslide is a previously unrecognized Late Pleistocene long run-out (LRO) rock avalanche, or sturzstrom, located in Anza-Borrego Desert State Park, eastern San Diego County, California (Figure 1). The Yaqui Flat LRO rock avalanche (Yaqui Flat Slide) is situated in Grapevine Canyon near the distal edge of a large alluvial fan emanating from the south side of Pinyon Ridge. We surmise that the landslide was previously unrecognized because of its partial burial by active fan deposition and because of its low profile and slight morphologic resemblance to younger fanglomerate deposits in the area.
Figure 1.
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