Devil’s Postpile National Monument in Central California. The formation known as columnar basalt, was formed by a lava flow more than 100,000 years ago. It is one of the National Park Service’s least visited parks in the 48 contiguous states.
Devil’s Postpile National Monument in Central California. The formation known as columnar basalt, was formed by a lava flow more than 100,000 years ago. It is one of the National Park Service’s least visited parks in the 48 contiguous states.