Geology of the Los Angeles Basin

See these USGS publications:

McCulloh, T.H., Beyer, L.A. and Morin, R.W., 2002, Mountain Meadows Dacite: Oligocene Intrusive Complex That Welds Together the Los Angeles Basin, Northwestern Peninsular Ranges, and Central Transverse Ranges, California: U.S. Geological Survey Professional Paper 1649 < http://geopubs.wr.usgs.gov/prof-paper/pp1649/>.

McCulloh, T.H., Fleck, R.J., Denison, R.E., Beyer, L.A., and Stanley, R.G., 2003, Age and Tectonic Significance of Volcanic Rocks in the Northern Los Angeles Basin, California: U.S. Geological Survey Professional Paper 1669 <http://geopubs.wr.usgs.gov/prof-paper/pp1669/>.

McCulloh, T.H. and Beyer, L.A., 2004, Mid-Tertiary Isopach and Lithofacies Maps for the Los Angeles Region, California: Templates for Palinspastic Reconstruction to 17.4 Ma Geological Survey Professional Paper 1690 <http://pubs.usgs.gov/pp/pp1690/> .