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Golden, Colorado

Martin Marietta Aggregates with the famous I-70 roadcut cutting through Dinosaur Ridge in the background in Jefferson County, Colorado, September ©2020 hopkins/neoscenes.
Martin Marietta Aggregates with the famous I-70 roadcut cutting through Dinosaur Ridge in the background in Jefferson County, Colorado, September ©2020 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.