At about 68 million years ago, the Front Range began to rise again due to the Laramide orogeny in the west.[58][59] During the Cenozoic era, block uplift formed the present Rocky Mountains. The geologic composition of Rocky Mountain National Park was also affected by deformation and erosion during that era. The uplift disrupted the older drainage patterns and created the present drainage patterns.[60]

Maroon Bells-Snowmass Wilderness showcases some of Colorado's most spectacular Rocky Mountain scenery and offers a chance to get out of your car and into nature. This area has six mountains over 14,000 feet, along with forests, alpine lakes, meadows, and 175 miles of trails to help you explore the terrain. Alternatively, you can enjoy the views on some of the scenic drives.
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. 
You can climb and slide on the dunes or test your boarding skills cruising down the sand. On hot days, children and even adults enjoy splashing around in the Medano Creek that runs along the base of the dunes. Hiking trails run through the forest on the edge of the dunes. The four-wheel drive Medano Pass Primitive Road opens up some unique terrain, and car camping sites are located along the roadside. Regular camping is available at the Pinon Flats campground, which offers both tent and RV campsites.
Known for its prominence in the movie ‘The Shining,’ the historic Stanley Hotel is the centerpiece of Estes Park. But for a more secluded, romantic stay, choose an intimate place like the Dunraven Inn, where a friendly and casual ambiance puts a soul at rest. If you’re looking for a place in the woods with fabulous mountain views and a warmly bubbling jetted tub that’s just a short walk to town, choose a Prospect cabin. Just outside the door of your vacation rental and along the scenic drives, you’ll catch wildlife frolicking in the fresh air.

Some of the highlights along the way are the towns of Silverton, Ouray, and Telluride. Set at more than 9,300 feet and surrounded by mountains, Silverton has one main street with a few shops and restaurants. In summer, it can be ridiculously busy, but in winter, most of the establishments are closed, and the place can feel like a ghost town. On the edge of town, Silverton Mountain is an old school ski "resort" with great backcountry downhill skiing for advanced skiiers. Ouray, with a sign at the main lookout calling it the "Switzerland of America," is another mountain town, known for its hot springs. If you choose to do the Skyway, you can stop in at Telluride. Known for the Telluride Ski Resort, this is one of the most beautiful mountain towns in America, with a traditional main street and gorgeous mountain scenery. You can take a free gondola up the mountain for a better look over the area.
At 265,000 acres, Rocky Mountain National Park isn't the country's largest national park, nor is it the most-frequented with about 4 million annual visitors (compared to Great Smoky Mountains National Park's more than 11 million visitors). But there is something definitively magical about RMNP, which rises 12,183 feet into the Colorado sky. The main attraction is hiking its 350-some miles of trails that wind through pine and spruce forests, glittering alpine lakes, swaths of wildflowers and if you're lucky, some elk or bighorn sheep. And maybe it's the thinner atmosphere that goes to visitors' heads, but even the most jaded report feelings of awe and wonder after a day or two of breathing in that refreshing mountain air. 
Other interesting summer activities include guided tours of Chimney Rock National Monument, hot air balloon adventures and paddling, tubing or rafting along the San Juan River. In winter you can go dog-sledding, cross-country skiing, snow tubing and more at the Wolf Creek Ski Area, enjoy some brewery-hopping or simply relax in the natural Pagosa Hot Springs. Things to Do in Pagosa Springs
The riparian ecosystem runs through the montane, subalpine, and alpine tundra zones and creates a foundation for life, especially for species that thrive next to streams, rivers, and lakes.[74] The headwaters of the Colorado River, which provides water to many of the southwestern states, are located on the west side of the park. The Fall River, Cache la Poudre River and Big Thompson Rivers are located on the east side of the park. Just like the other ecosystems in the park, the riparian zone is affected by the climatic variables of temperature, precipitation, and elevation. Generally, riparian zones in valleys will have cooler temperatures than communities located on slopes and ridge tops. Depending on elevation, a riparian zone may have more or less precipitation than other riparian zones in the park, with the difference creating a shift in the types of plants and animals found in a specific zone.[75]

Above tree line, at approximately 11,000 ft (3,400 m), trees disappear and the vast alpine tundra takes over.[69] Over one third of the park resides above the tree line, an area which limits plant growth due to the cold climate and strong winds. The few plants that can survive under such extreme conditions are mostly perennials. Many alpine plants are dwarfed at high elevations, though their occasional blossoms may be full-sized.[73]
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