Boulder County Open Space, northeast of Lyons, CO
Cretaceous, Dakota Sandstone (Plainview Member) draping over the Rabbit Mt. anticline
View back to the trailhead parking
The group exploring a Dakota Sandstone cliff
Cemex cement plant in the distance
Longs Peak flanked by Mt. Meeker and Mt. Lady Washington
Cemex cement plant quarry in the Dowe Flat syncline.
The Fort Hayes Member of the Niobrara formation is being mine for limestone.
The grey rock is Pierre Shale.
Little Thompson Overlook trail