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Parachute, Colorado

The Eocene Green River Formation, forming the slope in the background, contains most oil shale reserves in the state, near Parachute, Colorado, September ©2019 hopkins/neoscenes.
The Eocene Green River Formation, forming the slope in the background, contains most oil shale reserves in the state, near Parachute, Colorado, August ©2019 hopkins/neoscenes.

Trinidad Lake State Park, Colorado

The K–Pg (Cretaceous-Paleogene) boundary exposure at Longs Canyon in Trinidad Lake State Park, Colorado, shows an abrupt change from dark- to light-colored rock, October ©2019 hopkins/neoscenes.
The K–Pg (Cretaceous-Paleogene) boundary exposure at Longs Canyon in Trinidad Lake State Park, Colorado, shows an abrupt change from dark- to light-colored rock, October ©2019 hopkins/neoscenes.