Carl H. Beal, 1948. "RECONNAISSANCE OF THE GEOLOGY AND OIL POSSIBILITIES OF BAJA CALIFORNIA, MEXICO", Reconnaissance of the Geology and Oil Possibilities of Baja California, Mexico, Carl H. Beal
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Baja California is about the same length (1300 km.) as California and has a little more than a third its area. Essentially it is a westward-tilted fault block, with its mountainous northern half consisting mainly of crystalline rocks, which rise to elevations of more than 10,000 feet. Most of its southern half is a great area of volcanic flows and detrital rocks, overlying crystalline rocks and unaltered Tertiary marine sediments of pre-Upper Miocene age.
The formations exposed are the partly metamorphosed Lower and early (?) Upper Cretaceous San Fernando formation, unconformably overlain by the unaltered Upper Cretaceous Rosario formation; the...