This annotated UAV (drone) image illustrates the principal features of the Black Canyon City landslide. • Perimeter: 1.30 miles (2.1 km)| Area: 0.09 square miles (0.23 km) • Headscarp: ~1,320 feet (400 m) long on the E-W along long axis • Landslide width: maximum ~1,650 feet (500 m); typically ~ 1,310 feet (400 m) • Maximum length: ~ 2,000 feet (610 m) N-S direction; maximum relief ~ 480 feet (146 m) Prominent tension cracks appear 300 feet (91 m) downslope of the head scarp. These open fractures indicate recent movement within the slide mass body. As with other landslides in the Black Canyon area, mass wasting is rooted in the less competent Chalk Canyon Formation capped by competent Tertiary Hickey Formation basalt lava flows. Image by B. Gootee, annotation by J. Cook.