The Coastal Range Batholith is a large geological formation located along the western coast of North America, primarily in the state of California. It consists mainly of granitic rock and was formed during the late Mesozoic era, around 100 to 200 million years ago, through the cooling and solidification of magma beneath the Earth's surface. This batholith is part of the larger Coastal Ranges mountain system and extends from San Francisco to Los Angeles. It plays a significant role in the region's geology and ecology, influencing local landscapes, soil types, and water drainage patterns. The Coastal Range Batholith is also important for understanding the tectonic history of the area.