|
Text Description: Not a visible tephra layer: cryptotephra. 234–238 cm depth in core. Colourless and vesicular, with a medium grain size of ca. 50 microns. References: ![]() |
This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G22AC00137
Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.