. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. nsupposed equivalents of theVaqueros formation near the Torrey Canyojwells. Ventura County. Fig. 3. Pecten (Pseudamusium) peckhami Gabb. 164839. Right and leftvalves in matrix: altitude of Largesl 17 mm. Monterey shale (middleMiocene), southeasl of Pinole, Contra Costa County. The type of thlspecies came from i he ()jai Valley, Ventura (Jounty. It is the commonestform in the shales of the middle Miocene (Monterey, Modelo, and equiva-lent formations) and is also known
. Bulletin of the United States Geological Survey--The Santa Clara Valley, Puente Hills and Los Angeles Oil Districts. nsupposed equivalents of theVaqueros formation near the Torrey Canyojwells. Ventura County. Fig. 3. Pecten (Pseudamusium) peckhami Gabb. 164839. Right and leftvalves in matrix: altitude of Largesl 17 mm. Monterey shale (middleMiocene), southeasl of Pinole, Contra Costa County. The type of thlspecies came from i he ()jai Valley, Ventura (Jounty. It is the commonestform in the shales of the middle Miocene (Monterey, Modelo, and equiva-lent formations) and is also known from the Oligocene in the Santa CruzMountains. l-io. 1. Xarrita callosa Gabb. 161992. View from above, specimenslightly tilted; maximum Latitude 11 mm. Lower Miocene, head ofTopanga Canyon, 3 miles south of Calabasas, Los Angeles CountyRanges through the Miocene. Common in the lower Miocene of southernSan Joaquin Valley and the Santa Monica Mountains. Fig. 4a. Same specimen as fig. 4. View of base and aperture, showing characteristicshape of U. S. GEOLOGICAL SURVEY BULLETIN NO. 309 PL. X) 4C. \:
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