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]
Central Colorado - Pikes Peak RegionNestled within majestic Rocky Mountain scenery, Cripple Creek offers fun and adventures for the entire family. Try your luck in one of our exciting casinos, check out our fascinating museums, or explore our many history-rich activities such as a ride on the CC&V Narrow Gauge Railroad or a 1,000 foot descent underground into the Mollie Kathleen Mine.
There’s no need to travel far from Denver unless you really want to. Boulder is less than an hour’s drive away and is home to the luxurious St. Julien Hotel and Spa. One of the state’s most romantic properties, by booking the St. Julien Suite you’ll enjoy an opulent two-room suite with a balcony, deep soaking tub and plenty of room and relax, unwind and enjoy your time together. You can even order up an in-room couples’ massage. When you do want to venture outside of your room, you’ll find lots to do in town and nearby. Hike the scenic trails that skirt its famous Flatirons Mountains, stroll through legendary open-air mall on Pearl Street, and dine at some fabulous restaurants like The Med, with its Greek Island-themed interior, fine wine and sumptuous Mediterranean small plates.

Pagosa Springs is a picturesque, off-the-beaten-path destination surrounded by the San Juan National Forest. It’s an ideal spot for a Colorado weekend trip, with beautiful hiking paths, numerous hot springs, and stunning spots like Chimney Rock National Monument and Treasure Falls. Or going off-roading for another fun way to make the most of this charming town’s personality and views.
Glacial geology in Rocky Mountain National Park can be seen from the mountain peaks to the valley floors. Ice is a powerful sculptor of this natural environment and large masses of moving ice are the most powerful tools. Telltale marks of giant glaciers can be seen all throughout the park. Streams and glaciations during the Quaternary period cut through the older sediment, creating mesa tops and alluvial plains, and revealing the present Rocky Mountains.[61] The glaciation removed as much as 5,000 feet (1,500 m) of sedimentary rocks from earlier inland sea deposits. This erosion exposed the basement rock of the Ancestral Rockies. Evidence of the uplifting and erosion can be found on the way to Rocky Mountain National Park in the hogbacks of the Front Range foothills.[60] Many sedimentary rocks from the Paleozoic and Mesozoic eras exist in the basins surrounding the park.[62]
Located 17 miles from the Winter Park ski resort and 16 miles from Vail, Frisco is the perfect small-town getaway. You can relive life as a miner in the Old West at Frisco’s historic park and museum or take a mountain bike ride that takes you over 55 miles of paved pathways. Strap on snowshoes or cross-country skis for a turn around the Frisco Nordic Center. During the summer, paddle or motor out to the Sentinel Island from the Frisco Bay Marina. Rent a cozy condo at Mountainside, or consider renting a lovely house on the Blue River. Warm up the evening with delicious farm-to-table fusion fare Italian-style at Bagalis Frisco.
Rocky Mountain National Park is home to herds of elk and bighorn sheep, but it also has a population of mountain lions and black bears. Although attacks are very rare, the National Park Service recommends visitors hike in groups since these animals are less likely to grow aggressive when faced with multiple people. Campers should also stow all food in food lockers if available or in airtight, bear-resistant containers. Ticks also pose a risk, and since these can be carriers for disease, it's important to do nightly tick checks after a day on the trails. 
Rocky Mountain National Park is an American national park located approximately 76 mi (122 km) northwest of Denver International Airport[4] in north-central Colorado, within the Front Range of the Rocky Mountains. The park is situated between the towns of Estes Park to the east and Grand Lake to the west. The eastern and westerns slopes of the Continental Divide run directly through the center of the park with the headwaters of the Colorado River located in the park's northwestern region.[5] The main features of the park include mountains, alpine lakes and a wide variety of wildlife within various climates and environments, from wooded forests to mountain tundra.
A famous winter destination for travelers throughout the country, Aspen’s four impressive ski mountains make up its beautiful surroundings. Nestled in the heart of the White River National Forest, this area is a mecca for winter sports, popular for skiing and snowboarding. While hitting the slopes is the area’s most beloved attraction, visitors can also explore the wealth of high-end boutiques, interesting museums and wonderful hiking trails. Those who want to experience a different kind of outdoor adventure can also try cross-country skiing, snowshoeing and fly-fishing. Boasting even more activities in the summertime, visitors can go rafting, horseback riding and soar above the city in a hot-air balloon.
The sun made us lazy, and after following Brian as he made his way upstream I found a wider expanse of sand and gravel, promptly plopping down on a pair of flip flops I had brought in my backpack as a make-shift seat. After identifying the northern harrier hawk over my head, and the savannas sparrows and red-winged blackbirds perched precariously on reeds across the water, I took out my knitting project. I didn’t have to worry about losing Brian; in the valley I could see for miles in both directions.
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