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The stone tools of these industries, along with preforms, lithic core, technical flakes, and pieces of angular debitage, mainly of chalcedony, are found on and in late middle Pleistocene-age fanglomerates and younger inset alluvial terraces in the Calico Hills (also known as the Yermo Hills) east of the Calico Peaks and the Calico Mountains.
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 ...
Coffey, Kevin Thomas (2019), Tectonic Reconstruction of the Southern San Andreas Fault System Using Segments of the Chocolate Mountains Anticlinorium in the San Gabriel Mountains, Southern California, U.S.A., UCLA, pp. 1–262
Fossil footprints show humans in North America more than 21,000 years ago, the earliest firm evidence for humans in the Americas and show people must have arrived here before the last Ice Age.
The Chico Formation is exposed in the Southern California Coast Ranges, western San Joaquin Valley, north of Mount Diablo, and in the Chico area of the northeastern Sacramento Valley. [1] It is also found in the eastern Simi Hills in Bell Canyon and Dayton Canyon, located in Los Angeles and Ventura Counties, near the community of West Hills. [1]
Researchers found that the dinosaur footprints were discovered over 3,700 miles ... This showed proof that “these river valleys could provide specific avenues for life to travel across the ...
The fossilized footprints were made public in 2021 and date back between 21,000 and 23,000 years, according to new research that builds upon past evidence. - National Park Service
In 2003, the California Department of Parks and Recreation purchased 1,784.5 acres (7.222 km 2) in Peace Valley, on the north side of the Sutter Buttes, for $3 million with the intent to develop it as a state park. In 2005 the Parks Commission determined that the property would be a state park, but it was not officially named.