BackgroundAlthough easily accessible by Interstate highway 70 which cuts across a lava flow from Dotsero, this volcanic center is one of the least known in the western United States.
The youngest feature, the Dotsero maar, was erupted along a ridge consisting of evaporites and reddish oxidized sandstones of Pennsylvanian age.
Small scoria cones were constructed along a NNE-SSW line on either side of the maar. Small lahars preceded the eruption of a basaltic lava flow that traveled 3 km down two narrow V-shaped valleys and spread out onto the floodplain of the Eagle River, diverting the river to the south side of the valley.
Older Pleistocene basaltic lava flows occur nearby at Willow Peak, McCoy, and Triangle Peak.
Source: GVP Dotsero volcano information
See also: Sentinel hub | Landsat 8