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The geology of California is highly complex, with numerous mountain ranges, substantial faulting and tectonic activity, rich natural resources and a history of both ancient and comparatively recent intense geological activity. The area formed as a series of small island arcs, deep-ocean sediments and mafic oceanic crust accreted to the western ...
Turbidites in the Venado Sandstone (Great Valley Sequence) at Lake Berryessa, California. The Great Valley Sequence of California is a 40,000-foot (12 km)-thick group of related geologic formations that are Late Jurassic through Cretaceous in age (150–65 Ma) on the geologic time scale. These sedimentary rocks were deposited during the late ...
Los Angeles Basin. The Los Angeles Basin is a sedimentary basin located in Southern California, in a region known as the Peninsular Ranges. The basin is also connected to an anomalous group of east-west trending chains of mountains collectively known as the Transverse Ranges. The present basin is a coastal lowland area, whose floor is marked by ...
The Vasquez Formation was described as "Vasquez Series" by Sharp in 1935, [1] and further described by Jahns (1939). [2] The formation crops out in the eponymous Vasquez Rocks, part of the Los Angeles Basin. [3] The formation was deposited in a series of minibasins between the San Gabriel and San Andreas Faults. [4]
Long Valley Caldera is a depression in eastern California that is adjacent to Mammoth Mountain. The valley is one of the Earth's largest calderas, measuring about 20 mi (32 km) long (east-west), 11 mi (18 km) wide (north-south), and up to 3,000 ft (910 m) deep. Long Valley was formed 760,000 years ago when a very large eruption released hot ash ...
Marysville Buttes (Sutter Buttes) Gas Field Geologic map Marysville Buttes (Sutter Buttes) Gas Field Geologic Cross Section with 3x vertical exaggeration. The Sutter Buttes (Maidu: Histum Yani or Esto Yamani, Wintun: Olonai-Tol, Nisenan: Estom Yanim) are a small circular complex of eroded volcanic lava domes which rise as buttes above the flat plains of the Sacramento Valley in Sutter County ...
Cross section (geology) A cross section of the Anadarko Basin. The letters A and B at the top correspond to the line labeled A--B on the smaller map. In this example, the vertical scale is exaggerated compared to the horizontal scale. A cross section or cross-section, in geology, is a diagram representing the geologic features intersecting a ...
Transverse Ranges. The Transverse Ranges are a group of mountain ranges of southern California, in the Pacific Coast Ranges physiographic region in North America. The Transverse Ranges begin at the southern end of the California Coast Ranges and lie within Santa Barbara, Ventura, Los Angeles, San Bernardino, Riverside and Kern counties.