Station 19AAJRS024. Geologist Michelle Coombs (USGS/AVO) sampling tephra.
This peninsula on the east side of Atka is composed of a base of ~20 meters of glacial diamict with poorly sorted clasts up to 1-meter-sized faceted boulders in a sandy matrix. More than 6 meters of layered tephras and soils cap this diamict. In other places along the shoreline, this diamict is underlain by layered lavas. Coombs and Schaefer have described the tephra section in detail and collected both tephra and soil samples.
Image courtesy of AVO/USGS.
Please cite the photographer and the Alaska Volcano Observatory / U.S. Geological Survey when using this image.
To obtain a high-resolution image, open the full size
page. Then, right click on the image and click
"Save Image As..." or "Save Picture as..."