Three hundred ninety-six m depth. Bed is nineteen cm thick. 20% light ash (graded; crystals present). Refractive index: 1.510.
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.