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]
Offering visitors a myriad of outdoor activities to choose from, Steamboat Springs is a fun-filled vacation destination for all types of travelers. While skiing and snowboarding at Mount Werner are the city’s biggest draws, visitors can also explore its vibrant cultural scene at the Steamboat Symphony Orchestra or the Steamboat Art Museum. Take a day to soak in the hot mineral springs at Old Town Hot Springs or Strawberry Park Hot Springs, go for a 360-degree mountain view gondola ride to the top of Mount Werner, or soak in the breathtaking waterfall views at Fish Creek Falls. Summertime is perfect for tubing on the Yampa River, where visitors can hike to iconic landmarks like Rabbits Ears or try their hand at trout fishing along the river.
Estes Park vacation rentals are always worth considering, but be sure to check the calendar before you book and you could enjoy something even more special. Estes Park hosts a variety of events throughout the year, any of which would make a great addition to your vacation itinerary. For example, in early June, the Estes Park Jazz Fest takes place and features jazz musicians from across the country and beyond.
Breckenridge is justifiably famous as one of the best ski resorts in the country, but spending a little time seeking out the off-piste charms of the town can be extremely rewarding. You can explore the thriving arts and culture scene or learn some Breckenridge history on a tour with a local expert – popular choices include the Historic Tour, the Haunted Tour and the Gold Mining Tour. In summer you can go hiking, biking, fishing, paddling and rafting, while in winter everyone heads to the slopes to enjoy world-class winter sport activities and ride the highest ski lift in the country. Things to Do in Breckenridge 
Tucked away in Wondervu in the heart of Golden, Colorado, Eldora Lodge is a lovely mountain ski lodge and retreat that offers comfortable accommodation and a plethora of outdoor activities. Guests can enjoy bed and breakfast lodgings in cozy log cabins, which are fully equipped with en-suite bathrooms and modern amenities, including climate control and flat-screen televisions.

Brian and I descended back to ~7,000 feet for dinner in a small-town Indian restaurant in Nederland, Colorado, west of Boulder. By then, both our heads ached like a bad hangover, and my lungs literally burned when I tried to inhale anything but shallow breaths. Add generalized joint pain, and I had a full-blown case of altitude sickness. Given that I am a noted hypochondriac, I expected the worst.
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