Death Valley is part of the Basin and Range Province, which is characterized by parallel mountain ranges and valleys. Since about 10 million years ago, the region around Death Valley has been subject to volcanic activity that has given rise to Ubehebe Craters, Yucca Mountain and a 400,000 years old cinder cone in southern Death Valley. This volcanic activity is of transitional alkaline character and has decreased in volume over time. Ubehebe Craters is fairly isolated from the other volcanic fields in the region.