The Proterozoic is the latest eon of the Precambrian supereon. In the early Proterozoic, the continental crust of Colorado was assembled from several older island arcs along the coast of the Archean Wyoming Craton. Early Proterozoic Vishnu Schist with pegmatite dikes can be seen in Black Canyon of the Gunnison.

Showing 1–16 of 40 results