14.7: Chapter Summary

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14.1 Physiographic Overview of the Transverse Ranges Province

The Transverse Ranges Province is an east-west oriented region in southern California.
This region consists of east-west trending basins and uplifted ranges.

14.2 Bedrock Geology of the Transverse Ranges Province

Igneous and metamorphic rocks as old as Proterozoic-Late Mesozoic are uplifted in ranges of in this region.
An unusual anorthosite complex is included in the Proterozoic rocks.
Mesozoic meta-sediments preserved in uplifted ranges are similar to the Franciscan Assemblage found along the Coast Ranges.
Mesozoic plutonic rocks are similar to those found elsewhere in California, in regions where the ancient arc magma chamber is preserved.

14.3 Cenozoic Sedimentation and Basin Development

Numerous deep basins throughout the region preserve sediments that date back to Late Cretaceous ages and are deformed by reverse faulting and folding.
Important basins are the Ventura-Soledad Basin in the Western Transverse Ranges and the extensive Los Angeles Basin, which is on the boundary of the Peninsular Ranges Province.
Basin sediments are mostly marine, but include periodic deposits of non-marine units.
The Sespe Fm. (Oligocene) is a collection of non-marine sands and conglomerates which records regional uplift.
The Miocene Monterey Formation (and its equivalents) is found in most basins and is the origin of petroleum deposits in this region.

14.4 Tectonic and Structural Evolution

This portion of California’s plate boundary changed from one of subduction to one of transform activity in the Middle to Late Cenozoic.
Large portions of the Transverse Ranges originated southward and have been carried into their current positions along with significant rotation in the Late Cenozoic.
The development of the Big Bend along the emerging San Andreas Fault system created a restraining bend in this region which produced transpressional deformation that resulted in uplifted ranges, deformed basins and crustal thickening.
The Transverse Ranges continue to be compressed in a north-south sense by reverse faulting and left-lateral shearing.

14.5 Geologic Hazards of the Transverse Ranges Province

This region has significant earthquake hazards from both strike-slip and reverse faults.
Earthquakes in this region prompted new legislation and have prompted the creation of collaborative studies of the seismic risk.
Flooding is a seasonal hazard in this region due to extreme weather events; these events are both natural and man-made.
Past flood events greatly impacted the region and led to measures to control river responses.
Landslides are widespread due to steep terrain and many areas of frictionally weak rock and continue to be a concern for residents.

14.6 Mineral and Petroleum Resources of the Transverse Ranges Province

The basin deposits of this area contain large reserves of oil and gas derived from Miocene sedimentary rocks.
Oil production has been going on for more than 100 years in this region.
Mining activities centered on resources derived from sedimentary rocks occur in this region.

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