The following descriptions apply to the map by Conrad and Ehlig (1987).
Mab basalt - submarine flows, pillowed flows, and breccias in the tuffaceous lithofacies of the Altamira Shale (Conrad and Ehlig, 1987).
Mac cherty lithofacies of the Altamira Shale - laminated porcelanite and chert plus minor dolostone and siliceous shale (Conrad and Ehlig, 1987).
Maph phosphatic lithofacies of the Altamira Shale - phosphatic diatomaceous shale and phosphatic mudstone with some layers of dolostone and thin layers of sandstone (Conrad and Ehlig, 1987).
Mat tuffaceous lithofacies of the Altamira Shale - porcelanite, silty and sandy shale, basalt and tuff (Conrad and Ehlig, 1987).
Mv Valmonte Diatomite - diatomite and phosphatic diatomaceous shale with minor porcelanite, chert, and dolostone (Conrad and Ehlig, 1987).
Mzcs Catalina Schist - derived from graywacke, chert, basaltic volcanics, and gabbro similar to the Franciscan assemblage of the California Coast Ranges but is more extensively metamorphosed than the Franciscan (Conrad and Ehlig, 1987).
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