Full Title: Cenozoic Stratigraphy of the Transverse Ranges and Adjacent Areas, Southern California
Author: Michael O. Woodburne
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Part I attempts to relate the largely Neogene nonmarine strata of the Transverse Ranges and adjacent areas of Southern California to the tectonic history of the region, with particular emphasis on the slip history of various branches of the San Andreas fault system. Because most of the nonmarine strata of this area are of Neogene age, the work is slanted toward that part of the Cenozoic Era. The data appear to support the thesis that for much of Neogene time, and especially during Hemphillian time, or from about 5 to 10 m.y. ago, nonmarine deposits of the Transverse Ranges accumulated in basins that were within less than 30 km of their present positions. Inasmuch as many of these basins are now truncated by various branches of the San Andreas fault system, it appears that none of these faults underwent large-scale right-lateral slip since emphillian time. Data on the magnitude of pre-Hemphillian slip are more ambiguous and, in some cases, directly conflicting. These situations are discussed as well.
Part II is designed to summarize the stratigraphic and temporal attributes of several Tertiary marine and nonmarine rock units that occur in certain districts of the Transverse Ranges and adjacent areas of Southern California. Each district contains sedimentary successions that yield information on the local geologic history, the shape and extent of the depositional basin, the paleoslope that prevailed during deposition, the kinds and distribution of locally derived as well as exotic clastic components, the timing of episodes of sedimentation, and the duration of hiatuses in the record. Because these districts are variously located with reference to several branches of the San Andreas fault system, the sedimentary record of one district can be compared with that of another to evaluate, for example, the possibility of their former alignment or the alignment of a given basin with a particular source area. Part I offers one of several possible interpretations of this sedimentary record in terms of the above kinds of considerations and concludes that, at least for Hemphillian and later parts of Neogene time, there has been considerable depositional continuity between basins associated with the Transverse Ranges. It thus appears unlikely that any of the faults that cross these areas have experienced more than 30 km of slip during the past 10 m.y. or so. The present paper sets out the data from which that interpretation was derived.
Published: 8/20/1975
ISBN Number: 0813721628
Pages: 101
Product Category: Special Papers
