Alta Lakes is a pristine and secluded wilderness setting situated 30 minutes outside the charming mountain town of Telluride, Colorado.  The Observatory is nestled underneath the 13,000-foot peaks of the San Juan Mountains – it is one of only a few homes in the United States at 11,000+ feet! The backcountry cabin with charming rugged details serves as the perfect romantic mountain getaway for couples.
“The law is clear: if the federal government is shut down, our National Parks must also be closed to protect public safety and pristine spaces. It is not acceptable to use FLREA (Federal Lands Recreation Enhancement Act) funds to keep the parks open, and the Department of the Interior’s actions likely violate appropriations law,” McCollum said in a statement.
Marriott Courtyard Colorado Springs - we were very impressed with this Marriott, which we highly recommend for romantic & inexpensive accommodation in Central Colorado. The King Rooms with JACUZZI® tub are ideal for honeymoons, and the pool and on-site Bistro & Cocktail Bar are great. 2017 ERV Rating* for Couples - Colorado Springs Romantic Hotels: 77% - Good. (2570 Tenderfoot Hill St, Colorado Springs, CO  719-226-5006). See More of This Romantic Colorado Springs Jetted Tub Suite Here
The Snow Queen Lodge is a Victorian jewel built during Aspen's Wild West Silver Boom that was later converted to a family-run cozy bed and breakfast. It has nine charming rooms with private baths and tasteful Victorian details and a spacious loft at a different location. The lodge is located in downtown Aspen at the base of Aspen Mountain, walking distance from the gondola, world class skiing, and the free shuttles that will take you to other mountains such as Snowmass, Highlands, or Buttermilk.
^  This article incorporates public domain material from the Library of Congress document: "Majestic view from the old, one-way, dirt Fall River Road in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado". Library of Congress - Prints & Photographs Online Catalog. Retrieved October 28, 2016.

Ouray is one of the many historic Colorado mining towns that have re-invented themselves as outdoor playgrounds for adventure sport fanatics. The town is steeped in history, which you can explore at the Ouray County Historical Museum, the Ouray Alchemist Pharmaceutical Museum or on a tour of the Old Hundred Mine, before visiting one of the natural thermal pools that have been attracting visitors for over 100 years.
You can explore eight other designated Historic Neighborhoods before swapping history for nature as you hike or cycle the numerous scenic trails. Families can have fun at the Splash Water Park while adults can taste their way around small craft breweries and visit the largest American brewery on the Coors Tour. Keep reading for more Colorado points of interest. Things to Do in Golden
Soak in the hotel’s hot tubs after a day of skiing or warm up in front of the crackling fire in the lounge before heading out to enjoy one of the many activities the area has to offer. Enjoy hiking, fishing, mountain biking, skiing, or snowboarding. Wildlife lovers will delight in all the birds and wildlife to be found in the region, and romantics can stargaze on clear nights.

The Grand Junction Symphony Orchestra, the High Desert Opera, the Mesa State College Theatre and the Avalon Theatre provide a great selection of entertainment. Nature lovers can explore the diverse landscape along many miles of hiking and biking trails, try an off-road adventure, climb the marvelous red rock formations, or take to the rivers for some rafting, kayaking and paddling. Leave plenty of time to taste your way around the 22 wineries and tasting rooms. Things to Do in Grand Junction


It’s always “do not disturb” mode at this quaint adults-only hideaway in Crested Butte that’s strictly 16-plus. Just a few blocks from historic Elk Avenue, Purple Mountain Bed & Breakfast has six plush rooms, an onsite day spa and an outdoor hot tub. In the winter, a free shuttle whisks you to Mt. Crested Butte for some of Colorado’s best skiing; when you’re ready for après, retire back to the house for complimentary craft beer on tap and a Ghirardelli hot chocolate bar you won’t have to share with the kids. Happy hour, indeed. Find more B&Bs in Colorado >> 

Nature lovers can go hiking, white water rafting, horseback riding or climbing in one of the surrounding national parks, or you could choose to explore historic archaeological sites such as Hovenweep, Chaco Canyon and Mesa Verde. The Durango & Silverton Narrow Gauge Railroad is a highlight of any visit and you can combine various adventure sports packages with your scenic train ride. Keep reading for more Colorado points of interest. Things to Do in Durango
The A.R. Mitchell Museum of Western Art and the many galleries in the creative district are bound to thrill art lovers, while the Southern Colorado Repertory Theater provides live entertainment. Outdoor enthusiasts can go camping, fishing, hiking and boating in the Trinidad Lake State Park, seek dinosaur tracks in the Comanche National Grassland, or go trout fishing on the Purgatoire River.

The Experience: If Aspen isn't quite your mountain town scene, head to Vail instead. It's equally as idyllic (it was modeled after European mountain resorts), pedestrian-friendly, and lovely, but the town itself is more of a square in a village with a small collection of boutiques and restaurants for visitors. Ride up and down the gondolas for mountain views in every direction and ski the unique back bowls. It's also closer to Denver, making it easier to get to and, therefore, a little more crowded during peak seasons.
Take the world’s largest outdoor mineral hot springs pool (Glenwood Hot Springs), add an adventure park built on top of a mountain (Glenwood Caverns Adventure Park), sprinkle in the Roaring Fork Valley’s crimson rocks and emerald forests and you have a memorable family vacation just a few hours from Denver. The new Historic Fairy Caves Tour at Glenwood Caverns Adventure Park has sections never opened to the public before, takes 50 minutes and has only 12 stairs (perfect for families with small children than the tour of King’s Row, which has 127 steps each way). Also, don’t miss the adventure park’s thrill rides including the Cliff Hanger Roller Coaster, bungee jumping station, zipling, giant canyon swing, alpine coaster, laser tag and much more. Glenwood Hot Springs is celebrating its 125th birthday this year, so guests get in free on their birthdays. Glenwood Canyon Resort has white water rafting on the Colorado River and for an extra thrill, soar on the zipline across the river or test your mettle on a ropes course. Grab your bikes and take the paved Rio Grande Trail, which winds along the Roaring Fork River from Glenwood to Aspen. If you visit mid-week, pack a picnic and enjoy free concerts at Two Rivers Park on Wednesday. For a night out on the town, your family will love the Glenwood Vaudeville Revue dinner variety show.

Fishing was a popular pastime for early visitors to the park, and it remains so today, with anglers catching several types of trout, including brown, brook, rainbow and cutthroat. Note: A valid Colorado fishing license is required for all persons 16 years of age or older to fish in Rocky Mountain National Park. For current Colorado fishing license fees visit the Colorado Division of Wildlife website.
If you love the great outdoors but also want luxurious comfort on your vacation, let the Cabins at Rams Horn Village Resort be basecamp for your Rocky Mountain Getaway. Our western-styled Cabins are the definition of Rocky Mountain comfort w/ all the modern conveniences.  Each cabin is its own private retreat from everyday cares, allowing families & friends to come & play together, & build lifelong memories.  Rams Horn Village Resort Details
This three-story, immaculately furnished lodge can sleep up to 30 people and is located mere minutes from the entrance of Rocky Mountain National Park. It can be divided into two different suites for smaller groups. Overlooking the tranquil Trout Pond, the lodge has everything you need for a perfect family reunion, wedding, retreat or any large gathering.
Escape from the city with a romantic getaway just 30 minutes west of Denver to the Highland Haven Creekside Inn in Evergreen. This family-owned and operated Colorado Mountain B&B will charm you upon the moment of entering the wooded grounds. Their website describes it as an opportunity to create your own “Colorado Woodland Fairytale.” And it is that adorable.  Rustic. Quiet. Charming. And far enough away from it all to feel like a romantic getaway.
Would you like to stay in a historic red barn, a former milk room, or an original historic log cabin and get an idea of how the original Colorado settlers lived? Converted to the luxury Four Mile Creek Bed and Breakfast, this former 1885 homestead is a quaint reminder of the area’s adventurous past. With its main lodge building, old converted barn, and two log cabins, the Bed and Breakfast today offers rustic luxury and unparalleled comfort. The rooms are furnished with antique pieces and fireplaces, with luxurious bathrooms featuring claw foot tubs, conveying a sense of times gone by while providing entirely modern comfort and amenities.
One of the most historic hotels in Denver, the Oxford Hotel, is cozy and sultry, perfect for a time-traveling escape within the bustling city. The lush lobby sets the scene for the guest rooms, which seamlessly bring antique charm into comfort. Grab a cocktail in the red-illuminated Cruise Room on the main floor, and book a couple's massage in the on-site spa. Another especially lovely treatment is a milk bath in a clawfoot tub.
If you wish to have a romantic dinner outside of the hotel or resort you are staying at in Colorado Springs, you have to go to the Pepper Tree Restaurant. Its stylish architecture makes the restaurant one of the most beautiful in Colorado. You can enjoy spectacular views of the city skyline from the restaurant while feasting on a romantic dinner with your love. The restaurant serves high quality seafood, steak,s and legendary wines. Dining at the Pepper Tree Restaurant is a romantic and memorable culinary experience.
Owners Wendye Sykes and Shelley Powers came to Estes Park from San Francisco looking for an escape from the grind of everyday city life — and that’s exactly what they’ve created at River Spruce. Offering nine different cabins, you’ll find lodgings suitable for couples and families all nestled amidst the scenic Rocky Mountain wilderness and along the Big Thompson River.
Nature lovers can go hiking, white water rafting, horseback riding or climbing in one of the surrounding national parks, or you could choose to explore historic archaeological sites such as Hovenweep, Chaco Canyon and Mesa Verde. The Durango & Silverton Narrow Gauge Railroad is a highlight of any visit and you can combine various adventure sports packages with your scenic train ride. Keep reading for more Colorado points of interest. Things to Do in Durango 

The Silk Pincushion is a lovely Victorian bed and breakfast in the heart of Golden that promises an unforgettable stay. Three beautifully decorated Victorian-style guest rooms exude luxury and charm with large beds dressed in homemade quilts, private bathrooms with showers, deluxe toiletries and soaps, and other modern amenities such as free wireless Internet throughout the house. Homemade breakfast is served each morning in the bright and sunny dining room, where you can relax over freshly brewed coffee and chat with the owners.

Adventure Ridge is the big news at Vail and mid-summer, the resort will implement several new activities, including a four-line 1,200-foot long zip line, two aerial ropes courses, and a kids zip line as well as a kids ropes course, climbing wall, rebound trampoline. Gore Creek Mini Golf offers family-friendly putting atop the Lionshead base area for the second summer season. Grab your family and try the  FREE bean bag toss, horseshoes or the new slackline park where kids of all ages can test their balance at a variety of levels. If your kids are age four and older, they can use digging tools and a map to uncover dinosaur bones and learn about prehistoric creatures. The FREE Bud Light Hot Summer Nights Concert Series on Tuesdays June 12-August 21 has become the social event of the season. If you have aspiring adventurers, the 4th annual KEEN Vail Kids Adventure Race on August 10 and 11 lets kids ages 6 through 14 experience the thrill of adventure racing with mountain biking, hiking, tubing, archery, a low ropes course, a zip line, a climbing wall, a Tarzan swing, a giant slip-n-slide and more.
The Silk Pincushion is a lovely Victorian bed and breakfast in the heart of Golden that promises an unforgettable stay. Three beautifully decorated Victorian-style guest rooms exude luxury and charm with large beds dressed in homemade quilts, private bathrooms with showers, deluxe toiletries and soaps, and other modern amenities such as free wireless Internet throughout the house. Homemade breakfast is served each morning in the bright and sunny dining room, where you can relax over freshly brewed coffee and chat with the owners.
Only a few miles from downtown Denver, Littleton is a historic suburb of Denver with its own charm and history. Its turn-of-the-century houses are witnesses of the rich history while cozy restaurants and bars are inviting and popular. The Main Street has a lineup of independently owned galleries and shops. The Littleton Museum tells the story of the town’s past with its 19th century farm. Town Hall Arts Center presents community-run theater and music events. Littleton has more than 59 parks and two light rail stations with access to Downtown Denver. For outdoor enthusiasts, the Rockies are only half hour away. South Platte Park and Carson Nature Center offer hiking trails and fishing lakes. Pirates Cove Water Park has lap pools, a 35-foot slide, and a tubing river.
Only a short drive from lively Steamboat Springs, the Aspen View Lodge is tucked away on the edge of the Rabbit Ears Pass recreational area and Routt National Forest. Surrounded by mature aspens, the lodge fits in perfectly with its huge rough-hewn timbers and a wall of glass. The lodge can accommodate 35 guests in 12 contemporary, comfortable bedrooms with all the necessary amenities.
Quickly find vacation cabin rentals by state for vacations resorts, lake cottages, mountain cabins for rent, ocean homes rentals, lodges, dude ranches, villas, vacation listings and information, for your next family getaway. We have numerous cabins for rent in popular destinations such as Gatlinburg cabins, Pigeon Forge cabins, cabin rentals in the mountains, cabins on the lake, etc. We feature vacation cabins in Virginia, Missouri, Pennsylvania, North Carolina, and more. Find cabins for rent in the Smoky Mountains, Rocky Mountains. Or search for cabins in popular ski destinations such as Park City cabin rentals or cabins in Boone or Banner Elk, NC. Frequently searched rentals:
Another addition to the Denver skyline is the 165-room ART Hotel, which opened early summer of 2015. Located in downtown Denver’s Cultural District, the boutique hotel is simply unique, capturing the contemporary art scene as if the hotel were its sketching pad. When my husband and I stayed there, one of our favorite things to do order a cocktail at the rooftop bar and then step out onto the  FIRE Terrace, a unique Denver rooftop bar and restaurant experience with a fourth-floor patio that overlooks the bustling life of the Broadway Street below.
Tucked deep in the San Juan Mountains in southwestern Colorado, this carefully restored 19th-century ghost town and natural spa is surprisingly well appointed. The rugged, old-timey building exteriors hide high-end features such as cathedral ceilings, air conditioning, and gas fireplaces. Dolores has four parks and a peaceful bike trail that takes peddlers along the tumultuous Dolores River. You can enjoy hands-on exhibits and a nature hike at the Anasazi Heritage Center, or explore an exact replica of the original narrow-gauge rail car, the Galloping Goose. Share a romantic meal with tasty cocktails at Sophia’s Bistro.
The Centennial State is dotted with cool little towns, in the heart of the Rockies, as little as 1 hour and up to 3 hours from Denver. This is where I discovered the historic and romantic Palace Hotel in Salida, a boutique hotel that stole my heart — and it will do the same to you. Located steps from the banks of the Arkansas River, the newly renovated Palace Hotel is in a red-brick building located across from the Riverside Park. Think edgy Victorian and recycled furniture, an eclectic mix of old and new. Photovoltaic panels line the roof of the historic building, providing renewable electricity.

Perched on the western edge of the Rocky Mountain National Park, Grand Lake is the perfect weekend destination for outdoor enthusiasts and families traveling with kids. Providing easy access to hiking, Grand Lake is home to wildlife watching and winter activities such skiing and snowshoeing, where visitors are spoiled for choice in how they spend their days. A picturesque marina offers boat rentals and paddle boards, while there are sandy spots that are perfect for beach-related activities. Those who want to explore the area should drive along the scenic Trail Ridge Road and venture into the park to the nearby town of Estes Park on its other side.
The Cliff House at Pikes Peak is surprisingly affordable, with additional add-ons that can add a lot to your escape without breaking the bank. Add some chocolate-covered strawberries, crème brulee or an artisan cheese plate to your room for just a few dollars more. Or you can spring for a bottle or two of sparkling wine or Vista Point Chardonnay. Once you arrive, however, you’ll be blown away at the beautiful accommodations in this elegant late 1800s-style hotel with amazing mountain views, two-person spa tubs and much more. Stay at the hotel for some fine dining, venture into Manitou Springs to take in the beautiful sights or head to nearby Cripple Creek for some casino gambling.

Rock climbing and mountaineering opportunities include Lumpy Ridge,[85] Hallett Peak, and Longs Peak, the highest peak in the park, with the easiest route being the Keyhole Route. This 8 mi (13 km) one-way climb has an elevation gain of 4,850 ft (1,480 m). The vast east face, including the area known as The Diamond, is home to many classic big wall rock climbing routes. Many of the highest peaks have technical ice and rock routes on them, ranging from short scrambles to long multi-pitch climbs.[86]
Although Aspen is best known as a winter sports destination, this lovely little town in the heart of the White River National Forest is a brilliant year-round destination for active adventurers, festival lovers and arts aficionados. Besides downhill skiing, you can try cross-country skiing, snowshoeing, snowmobiling, ice skating and dog sledding, before rounding off your day with Après-Ski cocktails, local craft beers or a delicious meal.
Rooms are beautifully decorated with plush furnishings and luxurious fabrics and boast private en-suite bathrooms and modern amenities, including air-conditioning, coffeemakers, and free high-speed wireless Internet access. Flat screen televisions and cable TV provides ample entertainment and a delicious home cooked breakfast is served each morning. The inn is within close proximity to several popular Golden attractions, including the world-famous Red Rocks Amphitheatre and Golden Gate State National Park.
The best time to visit Rocky Mountain National Park is from June to September when the snow is (mostly) melted and the hiking trails and attractions are accessible. Still, these four months are also the most popular times to visit, so if you'd rather experience RMNP in relative isolation and while wearing snowshoes or cross-country skis, visit between the months of October and May. Whether snow or sunshine, the park is open to the public 24 hours a day, 365 days a year, though some parts may be inaccessible. 

Become immersed in Rocky’s pristine landscape on some of the park’s 355 miles of hiking trails. Choose from flat lakeside walks to steeper, more challenging mountain climbs. The easy .6-mile Bear Lake trail is a popular hike featuring an interpretive nature trail hugging a subalpine lake at the end of Bear Lake Road. For a stunning waterfall hike, make your way to Alberta Falls or Ouzel Falls.
^  This article incorporates public domain material from the Library of Congress document: "Majestic view from the old, one-way, dirt Fall River Road in Rocky Mountain National Park in the Front Range of the spectacular and high Rockies in north-central Colorado". Library of Congress - Prints & Photographs Online Catalog. Retrieved October 28, 2016.
Estes Park is home to the headquarters of the Rocky Mountain National Park, and for many visitors, it’s the first stop en route to a Rocky Mountain vacation. Find yourself passing through to pick up maps and check trail conditions, or stay for a weekend getaway that offers unbeatable access to the Rockies, meaning you can hike all day and dine and unwind at night. The lively town has plenty of entertainment like the downtown Riverwalk,  Aspen and Evergreen Gallery, and the historic Stanley Hotel.
If you and your valentine enjoy winter adventures, a mountain escape is perfect for a weekend away! Opt for your favorite resort or venture somewhere new to enjoy outdoor winter activities during the day, like snowshoeing, skiing and skating, and relax at night with drinks and hot tubbing. Make the weekend extra special with a horse-drawn carriage ride to dinner. Find a Colorado cabin perfect for any getaway here .
^ Montana State University states in their profile of Rocky Mountain National Park that there has been an increase of 2.5 °F (1.4 °C) in the average park temperature over "the past century" (charts show the period from about 1895-2010).[48] The National Park Service site states that the increase has been 3.4 °F (1.9 °C) over "the last century" (chart shows the period from about 1905-2010).[52]
Visiting several national parks, including Rocky Mountain National Park, is easy or make the most of the abundant outdoor activities, which include hiking, biking, rafting, kayaking, fishing, golf and horseback riding. There are several fascinating museums and over 15 galleries to visit on the First Friday Gallery Walk. Round off the day with a Local Table foodie tour or take in a Canyon Concert Ballet or the Fort Collins Symphony Orchestra. Things to Do in Fort Collins
What could be more romantic than enjoying a candlelit dinner for two as you gaze out over the elegant natural beauty of the Rocky Mountains? In Colorado, this is an occurrence that happens on a regular basis thanks to the close proximity to these majestic peaks. The Antlers at Vail has luxurious condos and vacation homes for a great private retreat. Enjoy your proximity to Vail Mountain and curl up by your gas fireplace. The Osprey at Beaver Creek, A RockResort is your perfect romantic getaway with steam showers and stunning fireplaces in your luxurious accommodations. And for a great experience, Mt. Prince Hot Springs Resort has the elegant Princeton Club and gorgeous hot springs to warm and relax you and your sweetheart in bliss. Start planning your own romantic rendezvous to Colorado today!
Spa facilities are quite unique - hot springs are housed in the teepee and bath house, while the massage and yoga rooms are located in the Pony Express Stop. Direct feeds from geothermal springs in some of the guest cabins are even more surprising and a fun adventure honeymoon idea. Spa treatments offered at the spa include wraps, reflexology, Trager Therapy, hot rocks massage and other holistic and therapeutic healing techniques. The resort is situated near the Four Corners and in the midst of two national forests where you can enjoy hiking, climbing, snow-shoeing, back country skiing, heli-skiing and fly fishing on your adventure honeymoon.
The nearest airport is Denver International Airport[91] and the closest train station is the Denver Union Station. Estes Park may be reached by rental car, shuttle or RTD bus.[91][98] During peak tourist season, there is free shuttle service within the park and the town of Estes Park provides shuttle service to Estes Park Visitor Center, surrounding campgrounds, and the Rocky Mountain National Park's shuttles.[91]
Offering visitors a glimpse into Colorado’s rich history, Georgetown is a charming Victorian mining town nestled just west of Denver. Once the third-largest city in the state, Georgetown was built in 1884 to service the silver mines. Visitors can take a ride on the famous Georgetown Loop Railroad to Silver Plume and back, or visit the well-preserved Hotel de Paris to browse artifacts from the era. Learn how the wealthy locals used to live at the Hamill House Museum or simply browse the charming streets lined with Victorian-era homes and shops. Those who want to explore the area by car should drive along the Guanella Pass, a long stretch of road with picturesque views, before taking rest in one of the area’s many Victorian bed and breakfast inns.

Rock climbing and mountaineering opportunities include Lumpy Ridge,[85] Hallett Peak, and Longs Peak, the highest peak in the park, with the easiest route being the Keyhole Route. This 8 mi (13 km) one-way climb has an elevation gain of 4,850 ft (1,480 m). The vast east face, including the area known as The Diamond, is home to many classic big wall rock climbing routes. Many of the highest peaks have technical ice and rock routes on them, ranging from short scrambles to long multi-pitch climbs.[86]
Designated as an All American Road, Trail Ridge Road crosses from beautiful pine forests to alpine tundra at some of the highest points in Rocky Mountain National Park. The drive is so high, that visitors will climb 4,000 feet in a matter of minutes! Outside of the car, plant and wildlife flourish throughout the drive -- moose, bighorn sheep and around 200 species of alpine plants are a few of the amazing sights that you might see. With a top altitude of over 12,000 feet, slow speeds and deep breaths are recommended. Janine Dawley, www.sharetheexperience.org

The Rockies are unbelievable. We explored the Niwot Ridge tundra plateau, speckled with wildflowers of every shape and color, looked down on the layered blue mountain ranges below, while snow-tipped peaks gazed at us from still-greater heights. I felt the elevation only in the difficulty breathing I experienced when walking from Point A to Point B - but we walked for more than three miles. Otherwise, it was the height itself that pulsed through my veins, truly on top of the world.
With majestic mountains, tundra wildflowers, abundant wildlife, Trail Ridge Road (the highest paved road in the US), and over 350 miles of trails, Rocky Mountain National Park is spectacular!  From flat easy hikes around a mountain lake to challenging multiday backpack trips and climbs, Rocky Mountain National Park offers trails for hikers of every level - let us help you plan your adventure!  Find the best ways to take in the majesty and serenity of the park.  It's YOUR Rocky - explore it!
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.
Whether an avid mountain explorer, nature enthusiast, or distant traveler in search of best days ever, This Mountain Life offers the ideal setup for your next Colorado USA mountain town encounter. Through our elite and uncommon classic guest traveler cabins — Redemption Cabin, Exploration Cabin and Reflection Cabin — you’ll find peace, romance, exciting adventures and exhilarating moments. Amble our riverbanks, ramble our trails and scramble our peaks to discover heavenly context for your next beautiful chapter and amazing rejuvenation. 
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] 
×