Abstract
Upper Cretaceous rocks of the Warthan Canyon area, near Coalinga, California, are a marine sequence of shale, sandstone, and conglomerate. The shale has numerous thin beds of sandstone that show several varieties of sedimentary structures including sole markings, convolute laminations, ripple marks, and cross-laminations. Paleocurrent analysis indicates that two types of currents influenced distribution of sediments during the deposition of the Panoche Group--episodal and contour currents. Episodal currents traveled down the subaqueous slope and transported land-derived sediments; contour currents traveled parallel with the isobaths of the subaqueous slope and redistributed and reworked part of the sediments. Episodal westward-moving currents were dominant during Cenomanian deposition. During Turonian-Coniacian deposition episodal currents were directed toward the southeast, presumably because of a shift in the subaqueous slope caused by tectonic activity, whereas contour currents traveled toward the southwest.
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