Abstract
Exposures of late Pleistocene sediments near San Felipe, Baja California, Mexico, provide an unusual opportunity to observe shoreline features in ancient sediments. The deposits contain interbedded alluvial gravels, dune sands, beaches, intertidal mud, and evaporites in sequences that reflect repeated transgression and regression of the shoreline. The area contains the most complete record of late Pleistocene events preserved anywhere along the coastal plain of the northwestern Gulf of California. Stratigraphic and geomorphic relationships document the following sequence: (1) alluviation and pedimentation; (2) erosional transgression and arroyo cutting; (3) depositional regression and arroyo filling during continued sea level rise; (4) Recent erosional transgression and arroyo cutting. Present dating techniques do not permit correlation of these events with the subdivisions of the late Quaternary time scale.
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