Dike in Sisters Rocks, West Crater Volcanic Field, Washington
By Cascades Volcano Observatory
June 2025 (approx.)
Detailed Description
A basalt of Sister Rocks dike (a subsurface magmatic structure) cutting across a scoria deposit from a previous eruption of Sister Rocks. Being in a scoria deposit can indicate that you are near a volcanic vent, as scoria is not ejected very far from its source. This feature can be accessed just off the trail to the summit of Sister Rocks. USGS photo by Kellie Wall, June 2025.
Sources/Usage
Public Domain.