April 22, 2005

Transverse Ranges (So. Calif.)

The Transverse Ranges are located in southern California, running across Ventura-Los Angeles-San Bernardino counties, from the Santa Ynez Mountains to the Los Angeles Basin. Nearly all mountain ranges in California are oriented north/south, in contrast to the east-west Transverse Range which has rotated 90 degrees over the last 17 million years. It is the part of the San Andreas fault known as the "Big Bend". See Ch 16, "California Geology", QE 89.H37 2004, for overview.
Articles can be found searching "Transverse Range" (or Ranges).
Many articles were found in the USGS Publications Warehouse:
http://pubs.er.usgs.gov/pubs/index.jsp?view=adv
MAPS are more challenging, because the Transverse Range area is so large that maps will only cover part of it, and therefore be named for the smaller features they show. One good strategy: pull out the map folders for geology of Los Angeles County (G 4363 .L6 C5) and Ventura County (G 4363 .V4 C5).
Also useful were 1:100,000 USGS topo maps, and the 1:250k Los Angeles topo sheet, for overviews.

For a view of the whole state that shows the east-west contrast well,
"Seismic Shaking Hazard Maps of California", G 4361.C5 1999 C3.
Last but not least, the Geologic Atlas of California is useful (on our Atlas Stand).
Included in the Transverse Ranges are the Santa Ynez, San Rafael, Santa Susana, Santa Monica, San Gabriel, San Bernardino, Little San Bernardino, and Orocopia mountain ranges. Also includes the Channel Islands.

Posted by cjahns at April 22, 2005 03:12 PM
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