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Explosive deposits from a massive eruption over 1 million years ago in Costa Rica. These ash and pumice deposits have been redeposited here by water. Look for cross bedding, ripples, and other structures associated with moving water. Some layers are conglomerates with rounded pumices.
- The Mount St. Helens National Volcanic Monument from the Johnston Ridge Observatory, Oct 21, 2010 by Gavin Farrell
The Johnston Ridge Observatory sits on a bluff just 5-1/2 miles from the crater at an elevation of 4,314'/1,327m and offers grand views of Mount St. Helens and much of the 1980 blast zone. Here you can enjoy spectacular views of the lava dome, crater, pumice plain and the landslide deposit.
Windy Ridge is one of the best places to get an overview of the area devastated by the 1980 eruption of Mount St. Helens. The landscape is littered with sand and gray rocks from that event. Deposits of the debris avalanche are visible to the west. These include the lower parts of The Spillover, where the debris avalanc...