They are the surface expression of an anticlinal structure which continues to the south as the Kettleman Hills, and to the north as Anticline Ridge, a portion of the huge Coalinga Oil Field.
12.
The Baldwin Hills area had tempted drillers for years, but all early attempts to find oil were unsuccessful, probably because erosion and faulting made the anticlinal structure appear farther east than it really was.
13.
Anticline Ridge is the surface expression of an anticlinal structure which continues to the south as the Guijarral Hills and Kettleman Hills, and is the location of a major part of the huge Coalinga Oil Field.
14.
The Lesser Himalaya thrust over the Siwaliks along the MBT to the south, and is overlained by the allochthonous thrust sheets of Kathmandu and HHC along the MCT . The Lesser Himalaya is folded into a vast post-metamorphic anticlinal structure known as the Kunchha-Gorkha anticlinorium.
15.
On top are the Pleistocene San Pedro and Pleistocene-upper Pliocene Santa Barbara formations; under that the Pico Sands, of Pliocene age, which contain areas of tar sands; under that, separated by an unconformity, the Monterey Formation, of Miocene age, which also contains tar sands ( the Vaca Tar Sand ); under that, again separated by an unconformity, the relatively impermeable Conejo-Topanga Formation, which caps the faulted anticlinal structure containing medium-grade oil about below ground surface.
