Coast Range Batholith

The Coast Range Batholith is a large body of igneous rock formed deep beneath the Earth's surface by the intrusion and solidification of magma. It is typically composed of coarse-grained rocks like granite or granodiorite and covers an area of at least 100 square kilometers. This batholith has an irregular shape with steep side walls that cut into the surrounding rock.1

The Coast Range Batholith is found in North America, extending from the Alaskan border through British Columbia and into Washington state. It is part of the larger Pacific mountain system and was formed by intrusions during the late Mesozoic to early Cenozoic eras, approximately 100 to 50 million years ago. The formation of these large bodies is often the result of multiple smaller intrusions coalescing over time.234