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Geologist Glenn White traces Calaveras County’s deep-time geology and gold history
Summary
At an Angels Camp Museum Foundation event, Glenn White, a geologist affiliated with Columbia College, led an illustrated talk describing Calaveras County’s geology from ancient seafloor rocks to Pleistocene glaciation and the region’s gold-mining history.
Glenn White, a geologist who teaches at Columbia College, gave an illustrated talk at an Angels Camp Museum Foundation event describing the deep-time geology of Calaveras County and how those processes concentrated gold in the region.
White told attendees that “this rock story goes back about 400,000,000 years” and used rock specimens and maps to explain how plate tectonics, subduction of the Farallon plate, and subsequent volcanism and uplift produced the mix of phyllite, greenstone, marble and granitic rocks found in the foothills.
White said California’s geologic history is driven by plate tectonics and accretion: seafloor sediments and volcanic material were scraped off and plastered onto the continent’s edge, then metamorphosed. He described how seafloor mud…
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