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Obsidian talus at Obsidian Dome, California Polished snowflake obsidian, formed through the inclusion of cristobalite crystals. The Natural History by the Roman writer Pliny the Elder includes a few sentences about a volcanic glass called obsidian (lapis obsidianus), discovered in Ethiopia by Obsidius, a Roman explorer. [9] [10] [11] [12]
Geologic map of the Sonoma Volcanics. The Sonoma Volcanics are a geologic formation of volcanic origin that is widespread in Napa and Sonoma counties, California.Most of the formation is Pliocene in age and includes obsidian, perlitic glass, diatomaceous mud, pyroclastic tuff, pumice, rhyolite tuffs, andesite breccias and interbedded volcanic lava flows.
In 1906 the state mineralogist of California reported on 52 ... discovered in 1873, source of ... An archaeological site which is the only known obsidian flow in Utah ...
The stratigraphy of the site suggests repeated occupation of the area across a long time period, from about 12,000 to present day. Important finds include Clovis-style projectile points fashioned out of obsidian, which was probably obtained from Borax Lake. The site was discovered in the 1930s by Chester Post, an amateur collector.
Millions of ancient fossils were discovered underneath a California high school and it's rewriting the state's history. Take a look. Jenny McGrath. September 20, 2024 at 12:19 PM.
The flows occurred between 400,000 years ago and 10,000 years ago. During this period, the glacial flows would run through Fossil Falls and smooth the vesicular basalt. The erosion found at Fossil Falls was formed by the youngest glacial runoff, called the Tioga, from the Sierra Nevada Mountain Range about 20,000 to 10,000 years ago. [3] [5]
The octopus garden is believed to be home to some 20,000 female octopuses
A rarely seen deep sea fish is found in California, and scientists want to know why. August 15, 2024 at 1:20 PM.