Two hundred million years ago, a large mass of igneous rock was created as two land plates overlapped; the rock is visible as granite domes at Sierra Nevada Batholith which are thought to be the roots of subduction zone volcanoes.
Two hundred million years ago, a large mass of igneous rock was created as two land plates overlapped; the rock is visible as granite domes at Sierra Nevada Batholith which are thought to be the roots of subduction zone volcanoes.