Mount Saint Helens. Daniel and I went there to shoot star trails in early August. You are looking at the north face in warm late afternoon light. This is the side of the mountain that collapsed on May 18, 1980. Besides the column of ash that rose to 80,00 feet (24,384 meters) and was carried for hundreds of miles on the wind, six square miles (15.5 square kilometers) of pumice up to 120 feet (36.6 meters) deep, was deposited north of the mountain by pyroclastic flows. You can see how water has cut channels through the deposits of the Pumice Plain.
Johnston Ridge Observatory
Mount Saint Helens National Volcanic Monument