Four m depth. Bed is two cm thick. 99% light ash. Refractive index: 1.508.
Volcanic ash from DSDP Site 178, Gulf of Alaska
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.