Tephra layer that is 0.5-2 cm thick and 106 cm from the base of the 1912 Novarupta fallout layer. Pl>opx>cpx; opx:cpx = 3:1.
Explosive eruptive record in the Katmai region, Alaska Peninsula: an overview
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.