The truncated cone of Sunset Crater Volcano, a 1,000-foot-high cinder cone, dominates the surrounding fields of cinders, lava flows and spatter cones. The bright-reddish hues of the decomposed, water-stained sulphuric rock at the summit are in stark contrast with black basalt of the adjacent rocks. Sunset Crater Volcano errupted A.D. 1064-65 and was active intermittently for nearly 200 years. A self-guided trail leads over the Bonito lava flow: sturdy walking shoes are recommended. A paved road crosses the lava flow and connects the monument with Wupatki National Monument.