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The outcrops are located on the Pacific coast of Baja California, Mexico. They comprise a 1-km (3300-ft)-thick portion of the Upper Rosario Formation, an Upper Cretaceous slope succession that consists of hemipelagites and gravity-current deposits. In the Canyon San Fernando area, the Upper Rosario consists of the fill of a midslope submarine canyon overlain by a genetically related, unconfined channel-levee complex. Deposition occurred over approximately 1.6 million years, a time-scale consistent with a third- order sea-level cycle. Paleocurrent directions and paleogeographic reconstructions demonstrate that these channel systems flowed to the south-southwest on a west-southwest facing continental margin, indicating that...

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