A Delimitation of the Region

This is indicative of an anomalous quality of the disruption. For, although the province, as a whole, extends diagonally across the San Andreas fault, the fault itself "trends more(prenominal) east to watt within the transversal Ranges than normal" (Sharp 17).

At the junction of the Big Pine and San Andreas faults, Frazier Mountain lies to the south, while, to the north, beyond the atom of the Mojave Desert Province that fronts the mountains, the Sierra Nevada turns southwest and west in the Tehachapi mountains. To the west, the southern edgeal Ranges Province meets the Sierra Nevada Province at the point where the Temblor Range, having turned southeast and east into the San Emigdio Mountains and the Pleito cumulations, meets the Tehachapi Mountains. To the east of the junction of the Big Pine and San Andreas faults, the northern boundary of the Transverse Ranges Province is approximatelywhat less distinct. It is formed primarily by "a series of discontinuous faults of large displacement along the flanks" of the San Bernardino mountains and by the Pinto Mountain fault along the northern flank of the Pinto Mountains (Oakeshott 281).

To the south the Transverse Ranges Province is bounded in the west by the Santa Monica Mountains, which form the northern knell of the Los Angeles Basin. This southern border in addition extends nearly 100 miles across the continental borderland into three of the Channel Islands, Santa Cruz,

Santa genus Rosa and San Miguel. Farther to the east the "Santa Monica-Raymond Hill-Sierra Madre-Cucamonga zone of faults" forms the southern border (Mason Hill 24). To the east of the point where this zone of faults meets the longitudinal San Jacinto fault the San Andreas fault "continues southeastward essentially as the southern boundary of the San Bernardino, critical San Bernardino and Orocopia Mountains" (Oakeshott 281).

Though this uplift of the ranges of south occidental California took place everywhere the last 15 million years, " some evidence indicates that the spate of the uplift of the Transverse and Peninsular Ranges has occurred since the Pliocene," and many experts estimate that most of this movement may have taken place in the Pleistocene (Schoenherr 326).

In the Pliocene there was extensive down payment of the Miocene formations chthonic the Pacific in those areas that now form the southern Coast Ranges and the western Transverse Ranges. There was renewed uplift of the areas northeastward of the San Andreas fault--including the eastern Transverse Ranges. To the southwest of the fault the San Gabriel Mountains were also re-elevated. In this period the majority of the western Transverse ranges were raised from the sea. The deposition of various materials in the Pliocene included the subsidence of the southern power of the San Bernardino Mountains, forming a valley. The Ridge Basin to the northeast of the San Gabriel fault also subsided and received heavy deposits of lacustrine and terrestrial sediments. At this prison term the Santa Barbara channel remained submerged and was narrowed as the long lines of the western Transverse Ranges rose to its north and south. The channel received some deposits from these ranges, but most of its sediments were from "those to the north and east, including the Alamo-Pine Mountain and San Gabriel Mountain uplifts" (Dibblee 22).

As the East Pacific Rise had approached its subduction zone, the shallow trough that was pin down between the
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