August 12, 2005
David Gilbert and Wendy Archibald take a close look at pumice fragments in the Bend Pumice.
Dark Columbia Canal tuff filling a channel within the underlying lighter colored Tumalo Tuff. A mapping exercise on an outcrop smaller than a soccer field.
Broken Top. A stratovolcano east of the Three Sisters that has been dissected by glaciers to expose lava flows on its flank.