paragraph_text: The Grand Canyon is a river valley in the Colorado Plateau that exposes uplifted Proterozoic and Paleozoic strata, and is also one of the six distinct physiographic sections of the Colorado Plateau province. It is not the deepest canyon in the world (Kali Gandaki Gorge in Nepal is much deeper). However, the Grand Canyon is known for its visually overwhelming size and its intricate and colorful landscape. Geologically, it is significant because of the thick sequence of ancient rocks that are well preserved and exposed in the walls of the canyon. These rock layers record much of the early geologic history of the North American continent.

paragraph_text: This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Grand Canyon National Park, Arizona, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a Google map.

paragraph_text: SS "Grand Canyon State" (T-ACS-3) is a crane ship in ready reserve for the United States Navy. The ship was named for the state of Arizona, which is also known as the "Grand Canyon State".

paragraph_text: The Silver Line is a bus rapid transit line run by the Interurban Transit Partnership in Grand Rapids, Michigan, United States. The line runs along Division Avenue on the Wyoming-Kentwood border into downtown Grand Rapids, where it loops around before terminating at Rapid Central Station. It began operation on August 25, 2014.

paragraph_text: The Grand Canyon North Rim Headquarters is a historic district on the North Rim of the Grand Canyon in Grand Canyon National Park, Arizona. Established from 1926 through the 1930s, the district includes examples of National Park Service Rustic architecture as applied to employee residences, administrative facilities and service structures.

paragraph_text: Byers Canyon is a short gorge on the upper Colorado River in Grand County, Colorado in the United States. The canyon is approximately 8 miles (13 km) long and is located in the headwaters region of the Colorado between Hot Sulphur Springs and Kremmling. U.S. Highway 40 passes through the canyon between Hot Sulphur Springs and Kremmling. The Union Pacific Railroad's Moffat Route also travels through the short canyon.

paragraph_text: Nearly two billion years of Earth's geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. While some aspects about the history of incision of the canyon are debated by geologists, several recent studies support the hypothesis that the Colorado River established its course through the area about 5 to 6 million years ago. Since that time, the Colorado River has driven the down - cutting of the tributaries and retreat of the cliffs, simultaneously deepening and widening the canyon.

paragraph_text: Thistle is a ghost town in Spanish Fork Canyon in southeastern Utah County, Utah, United States. During the era of steam locomotives, the town's primary industry was servicing trains for the Denver and Rio Grande Western Railroad (often shortened to D&RG, D&RGW, or Rio Grande). The fortunes of the town were closely linked with those of the railroad until the changeover to diesel locomotives, when the town started to decline.

paragraph_text: Grand Canyon National Park, located in northwestern Arizona, is the 15th site in the United States to have been named a national park. The park's central feature is the Grand Canyon, a gorge of the Colorado River, which is often considered one of the Wonders of the World. The park, which covers 1,217,262 acres (1,901.972 sq mi; 4,926.08 km) of unincorporated area in Coconino and Mohave counties, received more than six million recreational visitors in 2017, which is the second highest count of all American national parks after Great Smoky Mountains National Park. The Grand Canyon was designated a World Heritage Site by UNESCO in 1979.

paragraph_text: La Grande Vitesse, a public sculpture by American artist Alexander Calder, is located on the large concrete plaza surrounding City Hall and the Kent County Building in Grand Rapids, Michigan, United States. Popularly referred to as simply "the Calder", since its installation in 1969 it has come to be a symbol of Grand Rapids, and an abstraction of it is included in the city's official logo.

paragraph_text: Candor Chasma is one of the largest canyons in the Valles Marineris canyon system on Mars. The feature is geographically divided into two halves: East and West Candor Chasmas, respectively. It is unclear how the canyon originally formed; one theory is that it was expanded and deepened by tectonic processes similar to a graben, while another suggests that it was formed by subsurface water erosion similar to a karst. MRO discovered sulfates, hydrated sulfates, and iron oxides in Candor Chasma.

paragraph_text: Canyon Creek is a hamlet in northern Alberta, Canada within the Municipal District of Lesser Slave River No. 124. It is located on Highway 2, approximately east of Grande Prairie.

paragraph_text: U.S. President Theodore Roosevelt visited the Grand Canyon in 1903. An avid outdoorsman and staunch conservationist, Roosevelt established the Grand Canyon Game Preserve on November 28, 1906. Livestock grazing was reduced, but predators such as mountain lions, eagles, and wolves were eradicated. Roosevelt along with other members of his conservation group, the Boone and Crockett Club helped form the National Parks Association, which in turn lobbied for the Antiquities Act of 1906 which gave Roosevelt the power to create national monuments. Once the act was passed, Roosevelt immediately added adjacent national forest lands and redesignated the preserve a U.S. National Monument on January 11, 1908. Opponents such as land and mining claim holders blocked efforts to reclassify the monument as a U.S. National Park for 11 years. Grand Canyon National Park was finally established as the 17th U.S. National Park by an Act of Congress signed into law by President Woodrow Wilson on February 26, 1919.

paragraph_text: The Town of Cedaredge is a Home Rule Municipality in Delta County, Colorado, United States. The town population was 2253 at the 2010 United States Census. Cedaredge sits in the Surface Creek Valley beneath the southern slopes of the Grand Mesa, the largest mesa in the world. Its elevated vantage point affords southern views of the San Juan Mountains, the Black Canyon of the Gunnison National Park, and the communities of Delta, Olathe, and Montrose. Cedaredge is a small, agricultural community which produces beef cattle, apples, peaches, and wine from the region's few basic vineyards. Tourist attractions include Cedaredge Golf Club, Historic Pioneer Town, and an art gallery and craft store housed in a renovated apple packing shed. Regional sporting activities include camping, trophy hunting, hiking and Gold Medal fishing at more than 250 lakes on the Grand Mesa. During the winter locals partake in snowmobiling and Nordic skiing on the Mesa's trails. Powderhorn Resort is located north of Cedaredge and has ski terrain such as groomers, bumps, glades, and boulder fields, as well as two terrain parks.

paragraph_text: The Royal Society Range () is a majestic mountain range in Victoria Land, Antarctica. With its summit at , the massive Mount Lister forms the highest point in this range. Mount Lister is located along the western shore of McMurdo Sound between the Koettlitz, Skelton and Ferrar glaciers. Other notable local terrain features include Allison Glacier, which descends from the west slopes of the Royal Society Range into Skelton Glacier.

paragraph_text: The Grand Canyon (Hopi: Ongtupqa; Yavapai: Wi: kaʼi: la, Navajo: Tsékooh Hatsoh, Spanish: Gran Cañón) is a steep - sided canyon carved by the Colorado River in Arizona, United States. The Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and attains a depth of over a mile (6,093 feet or 1,857 meters).

paragraph_text: Gore Canyon is a short isolated canyon on the upper Colorado River in southwestern Grand County, Colorado in the United States. The steep and rugged canyon, approximately 3 miles (5 km) long, was carved by the river as it passed the northern end of the Gore Range southwest of Kremmling. The Colorado descends from approximately to approximately over the length of the canyon. The steep walls ascend approximately on either side. The canyon effectively marks the southwestern end of the Middle Park basin in north central Colorado.

paragraph_text: GVSU Fieldhouse Arena is a 4,200-seat indoor arena located in Allendale, Michigan, a suburb of Grand Rapids, on the campus of Grand Valley State University. It was built in the early 1980s as the home of the Grand Valley State University Lakers basketball and volleyball teams, as it remains to this day. The current fieldhouse replaced the former one when the roof of the "Dome" over the arena became unstable and was condemned.

paragraph_text: Hopi House is located on the South Rim of the Grand Canyon, within Grand Canyon National Park in the U.S. state of Arizona. Built in 1904 as concessioner facilities at the South Rim were being developed, it is the first of eight projects at the Grand Canyon that were designed by architect Mary Colter, along with Bright Angel Lodge, Hermit's Rest, Lookout Studio, Phantom Ranch, Desert View Watchtower, Colter Hall and Victor Hall, (the latter two being employee dormitories). Hopi House was built by the Fred Harvey Company as a market for Native American crafts, made by artisans on the site. The Hopi, as the historic inhabitants of the area, were chosen as the featured artisans, and the building was designed to closely resemble a traditional Hopi pueblo. Hopi House opened on January 1, 1905, two weeks before the El Tovar Hotel, located just to the west, was opened.

paragraph_text: Roaring Rapids are one of several rapids in the Black Canyon of the Colorado, 10.25 miles above El Dorado Canyon in the Colorado River between Arizona and Nevada.

Question: When did the river that the Roaring Rapids are on, start to form the Grand Canyon?
Answer: about 5 to 6 million years ago