Denudation, weathering and mass wasting - Fundamentals of the Physical Environment - page 306

Plate 13.19 The Blackhawk Slide, fanning out across the Mojave desert from the San Bernadino mountains (to the right),
southern California. Seen here from 30,000 ft, the lobe is 8 km long, 3 km wide, with a front 35 m high, and consists of millions
of tons of disintegrated marble. The slide occurred 17,000 years ago, perhaps triggered by an earthquake in the nearby San
Andreas fault zone.
Photo: Ken Addison
Plate 13.20 Toppling of cohesive, glaciofluvial gravels in a
quarry face, after tension cracking behind the working face
(right). The figure is standing on a toppled block.
Photo: Ken Addison