The first phase of regional plutonism started 210 million years ago in the late Triassic and continued throughout the Jurassic to about 150 million years before present (BP), which led to the creation of the Sierra Nevada Batholith. The resulting rocks were mostly granitic in composition and lay about below the surface. Around the same time, the Nevadan orogeny built the Nevadan mountain range (also called the Ancestral Sierra Nevada) to a height of .
The first phase of regional plutonism started 210 million years ago in the late Triassic and continued throughout the Jurassic to about 150 million years before present (BP), which led to the creation of the Sierra Nevada Batholith. The resulting rocks were mostly granitic in composition and lay about below the surface Around the same time, the Nevadan orogeny built the Nevadan mountain range (also called the Ancestral Sierra Nevada) to a height of 