Take Two

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Ancient tectonic plate discovered under California and Baja Mexico

by Take Two

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An ancient, "lost" tectonic plate that disappeared under North America millions of years ago may have been found again. The Isabella anomaly (IA, above), is at the same depth (ca. 100 km) as other fragments of the Farallon plate under Oregon and Washington, is on a line with fragments off the California coast, and has a similar seismic tomography signature. Forsyth lab/Brown University
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