20 cm thick. Scoria, 5 cm at the bottom is primary and the upper 15 cm looks reworked. Sample from the bottom 5 cm, which has clasts up to 2 cm in size.
Alaska Volcano Observatory website
This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G19AC00060 and G19AC00171.
Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.