A Geological Tour of Denver, Golden, and Colorado's Front Range

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A Theory | Seven Nations | Governments and Empires | Geological Past

Geologic Time Period

The Dakota Group...

Concretion in Dakota Sandstone on Dinosaur Ridge

Spherical concretion, an aggregate of mineral matter formed around a nucleus, such as shell, bone or organic matter, in Dakota Sandstone found on the crest of Dinosaur Ridge.

The Cretaceous Sea Coast