About: Sierran Arc

In early Triassic time, an extensive volcanic arc system called the Sierran Arc began to develop along the western margin of the North American continent. In Southern California, this volcanic arc would develop throughout the Mesozoic Era to become the geologic regions known as the Sierra Nevada Batholith, the , (in the Peninsular Ranges), and other plutonic and volcanic centers throughout the greater Mojave Desert region.