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Loss of life from alluvial fan floods continued into the 19th century, and the hazard of alluvial fan flooding remains a concern in Italy. [61] On January 1, 1934, record rainfall in a recently burned area of the San Gabriel Mountains, California, caused severe flooding of the alluvial fan on which the towns of Montrose and Glendale were built ...
The oldest rocks in California date back 1.8 billion years to the Proterozoic and are found in the San Gabriel Mountains, San Bernardino Mountains, and Mojave Desert.The rocks of eastern California formed a shallow continental shelf, with massive deposition of limestone during the Paleozoic, and sediments from this time are common in the Sierra Nevada, Klamath Mountains and eastern Transverse ...
Lytle Creek flows through the eastern San Gabriel Mountains and has three forks, the North, Middle and South forks. The source of the creek is at the confluence of the North Fork and Middle Fork Lytle Creek , just west of the town of Lytle Creek, California 34°14′24″N 117°29′55″W / 34.24000°N 117.49861°W / 34.24000; -117.
The Calico Early Man Site is an archaeological site in an ancient Pleistocene lake located near Barstow in San Bernardino County in the central Mojave Desert of Southern California. This site is on and in late middle- Pleistocene fanglomerates (now-cemented alluvial debris flow deposits) known variously as the Calico Hills, the Yermo Hills, or ...
In 1841, Cadwalader Ringgold, an officer in the United States Navy, spent twenty days surveying the San Francisco Bay watershed as a member of the United States Exploring Expedition In 1849, Cadwalader Ringgold began a more comprehensive survey the San Francisco Bay region, [11] the Sacramento River, and parts of the American and created several maps which included depth sounding information ...
The Vasquez Formation has been interpreted to represent primarily proximal alluvial-fan deposits. The lenses of granitoid crackle and jigsaw breccia in the Vasquez Formation north of Blue Ridge were concluded to be rock-avalanche deposits.
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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.