Fort Rock-Christmas Lake Valley Basin

The Fort Rock-Christmas Lake Valley Basin is the basin of a former inland sea that existed in that region from Pliocene through late Pleistocene time.The Fort Rock basin maar field includes over 30 hydrovolcanic landforms spread over an area of 1,500 square miles (4,000 km2). During the Pleistocene and early Holocene, Paleolake Fort Rock encompassed the entire basin.

Fort Rock-Christmas Lake Valley Basin

The Fort Rock-Christmas Lake Valley Basin is the basin of a former inland sea that existed in that region from Pliocene through late Pleistocene time.The Fort Rock basin maar field includes over 30 hydrovolcanic landforms spread over an area of 1,500 square miles (4,000 km2). During the Pleistocene and early Holocene, Paleolake Fort Rock encompassed the entire basin.