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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Fluctuations of sea level as much as 700 ft during the late Pleistocene have modified the continental margin of southern California and exercised a dominant control on the offshore sediment-distribution patterns. Narrow terraces and low sea cliffs were cut into bedrock during lowered sea stands. They are associated with anomalous occurrences of sand-algal nodules, concentrates of shallow-water shells, phosphorite, and rounded cobbles of mixed rock type. The rock outcrops exposed in the low sea cliffs provide a window that permits sampling and the mapping of bedrock
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structures from submersibles in an area normally covered with prograding slope deposits. The concentration of relict shallow-water fossils in deep terrace zones and the rough topography can be confused with nonexistent structural features if not recognized during sampling programs.
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