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Geologists Identify Rock Source of Native American Cogged Stones From Orange County


Study Reveals Stones Unique to Southern California
March 10, 2021
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As an undergraduate, geology alumna Sierra Patterson embarked on a study to help resolve an archaeological problem with geologic tools.
Patterson, alumnus Ryan McKay and their faculty research adviser Valbone “Vali” Memeti focused on learning more about the mystery of cogged stones. These ancient Native American artifacts are found in Southern California, including Orange County. The cogged stones were carved from various rock types into the shape of a hand-sized cogged wheel. 
This basaltic scoria is a commonly used rock to carve cogged stones.
One of the most commonly used rock types to carve the cogged stones is the basaltic scoria, a type of volcanic rock, said Memeti, assistant professor of geological sciences. ....

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Current issue articles for i Geosphere /i posted online in January


Current issue articles for
Geological Society of America
Geosphere, posts articles online regularly. Topics for articles posted for
Geosphere this month include feldspar recycling in Yosemite National Park; the Ragged Mountain Fault, Alaska; the Khao Khwang Fold and Thrust Belt, Thailand; the northern Sierra Nevada; and the Queen Charlotte Fault.
Feldspar recycling across magma mush bodies during the voluminous Half Dome and Cathedral Peak stages of the Tuolumne intrusive complex, Yosemite National Park, California, USA
Louis F. Oppenheim; Valbone Memeti; Calvin G. Barnes; Melissa Chambers; Joachim Krause .
Abstract: Incremental pluton growth can produce sheeted complexes with no magma-magma interaction or large, dynamic magma bodies communicating via crystal and melt exchanges, depending on pulse size and frequency of intrusions. Determining the degree and spatial extent of crystal-melt exchange along and away from plutonic contacts ....

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