There are about 40 cones in the Cima volcanic field. The cones are as much as wide and high, and are concentrated between elevations of on a south-southwest tilting slope. Some cones are well preserved with intact craters, while others have been reduced to hills by erosion. Some cones have more than one crater. North of the main field lie two outcrops of older volcanic rocks (Miocene to Pliocene); other than this separate older outcrop volcanic activity appears to have occurred without any preferential alignment. Several washes such as Willow Wash, Black Tank Wash and Indian Creek cross through the field and have eroded lava flows.