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In the Grand Canyon, the Tapeats Sandstone is a medium- to coarse-grained, thin-bedded, cliff-forming conglomeratic sandstone that weathers to a tan or reddish-brown. Its thickness varies from very thin or absent where deposited over prominent paleotopographic highs, as much as to 90 m (300 ft) high.
Location: Coconino and Mohave counties, Arizona, United States: Nearest city: Fredonia, Arizona (North Rim) Tusayan, Arizona (South Rim): Coordinates: 2]: Area: 1,217,262 acres (4,926.08 km 2) [3]: Established: January 11, 1908 () as a national monument February 26, 1919 () as a national park: Visitors: 4,733,705 (in 2023) [4]: Governing body: National Park Service: Website: nps.gov /grca ...
Rose Eudora Collom (née Wilson, 20 December 1870 – 26 December 1956) was an American botanist and plant collector. She was the first paid botanist of the Grand Canyon National Park.
Within the central Grand Canyon, Unkar strata occur in small, rotated, downfaulted blocks or slivers where they commonly are only partially exposed. Within this center part of the Grand Canyon, the Unkar Group is incomplete because pre-Tonto Group erosion has removed strata above the level of the middle part of the Dox Formation.
The Powell Geographic Expedition of 1869, led by American naturalist John Wesley Powell, was the first thorough cartographic and scientific investigation of long segments of the Green and Colorado rivers in the southwestern United States, including the first recorded passage of white men through the entirety of the Grand Canyon.
The national monument includes three large segments: to the south of Grand Canyon National Park, the 388,376 acres (1,571.70 km 2) entire Tusayan Ranger District of the Kaibab National Forest; to the northeast, 529,242 acres (2,141.77 km 2) of Bureau of Land Management (BLM) lands south of Vermilion Cliffs National Monument and east of the forest's North Kaibab Ranger District, including House ...
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