Lost tectonic plate found

Scientists found a tectonic plate that had diapered under North america millions of years ago still peaks out in places around California and Mexico. The Farallon oceanic plate was once nestled between the Pacific and North American plates, which were converging around 200 million years ago at what would become the San Andreas fault along the Pacific coast. This slow geological movement forced the Farallon plate under North America, a process called subduction. A lot of the Farallon plate got pushed down deep into the mantle below the crust. the plate then fragmented leaving some parts of the plate visible.
In California, these seismic surveys revealed a large mass of cool, dry material 62 miles to 124 miles 100 to 200 kilometers below the surface. This strange spot was dubbed the Isabella anomaly.