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Hole-in-the-Wall Professional Review and Guide
"A volcanic eruption 18 million years ago in the Mojave Desert emitted dense blasts of super-heated ash. The ash, dust, and volcanic gas from the eruption compacted and cemented together as it cooled, forming what is known as volcanic tuff. This popular loop hike explores the narrow Banshee Canyon that snakes through the fascinating and colorful rock formation. Gas trapped in the ash created pockets in the tuff resembling eternally moaning mouths, and the wind howls as it blows through the canyon. The hike descends a short vertical section in the narrow slot canyon; metal rings have been set in the rock to provide holds."
--David & Jennifer Money Harris, Afoot and Afield: Inland Empire (Wilderness Press).
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