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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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From northern San Diego County, California, to
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the Viscaino Desert of Baja California, a distance of 400 miles, the eastern extent of the Upper Cretaceous Rosario Formation can be plotted with the edge of a ruler. At several points the exhumed coast line is well exposed. In some places marine strata buttress directly against precipitous bedrock slopes. In other localities they interfinger with deltas of conglomerate which built from narrow gorges incised in the bedrock coast.
Westward from this paleocoast the Rosario thickens considerably in a short distance. At times, relatively deep water must have extended almost to the shore. The steep and straight paleocoast appears to have coincided with a hinge line, suggesting fault control. This tectonic line has continued to be active throughout the Cenozoic. Faults of Pleistocene age parallel the modern coast in several places.
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