Geology of Colorado (Boulder Valley) - Field Trip #1, Stop #5: Lykins, Canyon Spring, Morrison, Dakota Formations

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Upper Lykins formation: Alternating deposition of muddy shales (below) and sand (above). Sandstone is much more resistant to erosion than shales. That is why the sandstone ledge sticks out further than the underlying shales.
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Upper Lykins formation: Alternating deposition of muddy shales (below) and sand (above). Sandstone is much more resistant to erosion than shales. That is why the sandstone ledge sticks out further than the underlying shales.