Volcano List
About Alaska's Volcanoes Hazards from Alaska's Volcanoes
Map & Alphabetical List Interactive Map
Eruption Search Volcano Search
|
Text Description: Not a visible tephra layer: cryptotephra. 26–32 cm depth in the core. Colourless, pumiceous and highly vesicular glass shards, the median diameter of the shards being 30 microns. Even shards <20 microns in diameter are highly vesicular with micrometre-thin bubble walls. References:  Linking the North Atlantic to central Europe: A high-resolution Holocene tephrochronological record from northern Germany |
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.
Operations
Response
Staff
Fields of Study
Geology
Color Code Definitions
Webcams
Webicorders
RSAM
Great Sitkin
Trident
Glossary
Recent Images
Browse Images
