The Pierre Shale formation was deposited during the Paleogene and Cretaceous periods about 70 million years ago. The region was covered by a deep sea—the Cretaceous Western Interior Seaway—which deposited massive amounts of shale on the seabed. Both the thick stratum of shale and embedded marine life fossils—including ammonites and skeletons of fish and such marine reptiles as mosasaurs, plesiosaurs, and extinct species of sea turtles, along with rare dinosaur and bird remains—were created during this time period. The area now known as Colorado was eventually transformed from being at the bottom of an ocean to dry land again, giving yield to another fossiliferous rock layer known as the Denver Formation.[58]
By day, this forested hot spring just north of Steamboat Springs teems with families splashing in the all-natural pools. After dark, it becomes exclusively adults-only — and clothing-optional; don’t be surprised if you spy a cowboy or two taking a dip au naturel. Secluded hillside cabins and train cabooses are within sprinting distance from the pools, for those cooler Colorado nights.

It’s hard to beat the majestic setting at The Peaks Resort & Spa in Telluride. This property is surrounded by the dramatic peaks of the Rockies in the southwestern region of the state, and is particularly renowned for its spa. Here you can indulge in a variety of rejuvenating treatments like hot stone therapy, soak in the eucalyptus-filled Jacuzzis or take advantage of personal training sessions. Enjoy your days taking part in outdoor adventures like mountain biking or hiking the spectacular trails and then come back to enjoy a


Still haven’t packed enough into your Colorado vacation? Make time to see some of the great Colorado mountain attractions — tour a ghost town near Aspen, sail above the mountains in a balloon over Breckenridge, rock out at a music festival in Telluride, check out the nightlife scene in Vail and try your luck at a casino in Black Hawk, Central City or Cripple Creek.
Update on Jan. 14, 2019: A Rocky Mountain National Park spokesman said Monday the park began using recreation fees to temporarily pay about 10 percent of furloughed workers to clean up the park. They’ve been plowing roads, cleaning restrooms and collecting trash since Saturday. Other staff, such as law enforcement rangers, continue to work without pay during the shutdown. The park is expected to reopen to vehicle traffic on Tuesday, said Kyle Patterson, a Park spokesman who is on furlough.
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