Looking north along the eastern caldera rim on top of the caldera wall.  Horizontal deposits exposed in the cliff wall are remnants of a pre-caldera stratocone.  The undulating unit capping the wall is the welded pyroclastic flow deposit from the caldera-forming eruption, locally as thick as 5 meters, with pumice fall deposits from the same eruption directly beneath the welded unit.   Highly tilted rocks in the left foreground are phreatomagmatic surge deposits from post-caldera eruptions beneath the eastern caldera lake.

Looking north along the eastern caldera rim on top of the caldera wall. Horizontal deposits exposed in the cliff wall are remnants of a pre-caldera stratocone. The undulating unit capping the wall is the welded pyroclastic flow deposit from the caldera-forming eruption, locally as thick as 5 meters, with pumice fall deposits from the same eruption directly beneath the welded unit. Highly tilted rocks in the left foreground are phreatomagmatic surge deposits from post-caldera eruptions beneath the eastern caldera lake.

Date: Nov 30th, 1999
Volcano(es): Fisher
Photographer: Stelling, P. L.
URL: avo.alaska.edu/image/view/24623
Image courtesy of the photographer.
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