Abstract

Ranger submarine slide sheet on the upper continental slope of the Pacific margin of the Baja California, Mexico, peninsula covers more than 300 km2. The slide involved nearly 2 × 1010 m3 of partially indurated, late Pliocene and younger (?) hemipelagic muds which moved down a low, 3° slope in late Pleistocene time. A detailed bathymetric survey of the surface of sliding and slide sheet shows that the sediments, which were as much as 125 m thick, moved down a gently folded, disconformable surface on probable Miocene sedimentary rock. The slide was probably initiated by earthquakes occurring within the Sebastian Vizcaino Bay region.

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