Landslide Photo Collections

Searchable USGS Photo and Multimedia Archive with Ordering Information

The Blackhawk landslide is the largest slide in the Transverse Range province, on the north slope of the San Bernardino Mountains, California.

  • The largest slide in the Transverse Range province is the Blackhawk, on the north slope of the San Bernardino Mountains, California. This prehistoric slide is one of the largest known in North America. It was studied in detail by R. L. Shreve, who showed that the slide moved to its resting place on a cushion of compressed air.  Photo by Kerry Sieh, U.S. Geological Survey.
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  • Aerial veiw of the Blackhawk Landslide, in California.  The Blackhawk slide is 5 miles long, about 2 miles wide, and 30-100 feet thick. It is a tongue like sheet of brecciated Pennsylvanian Furnace Limestone derived from Blackhawk mountain about 4,000 feet above.
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  • Aerial view looking east at the toe of the ancient Blackhawk landslide in the Lucerne Valley, California.
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