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Grand Canyon lies on the southern end of the Intermountain West seismic belt. [84] At least 35 earthquakes larger than 3.0 on the Richter Scale occurred in the Grand Canyon region in the 20th century. [85] Of these, five registered over 5.0 on the Richter Scale and the largest was a 6.2 quake that occurred in January 1906. [85]
Figure 1. A geologic cross section of the Grand Canyon. [5]The Tonto Group is a name for an assemblage of related sedimentary strata, collectively known by geologists as a Group, that comprises the basal sequence Paleozoic strata exposed in the sides of the Grand Canyon.
East of the Grand Wash fault and in the Grand Canyon region, its thickness decreases abruptly to 52 m (171 ft) at Quartermaster Canyon, 106 m (348 ft) at 269-Mile Canyon, and 70 m (230 ft) near Diamond Bar Ranch. Further eastward in the Grand Canyon region, the thickness of the Frenchman Mountain Dolostone gradually decreases to 52 m (171 ft ...
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 ...
Blakey, Ron and Wayne Ranney, Ancient Landscapes of the Colorado Plateau, Grand Canyon Association (publisher), 2008, 176 pages, ISBN 978-1934656037 Chronic, Halka. Roadside Geology of Arizona, Mountain Press Publishing Co., 1983, 23rd printing, pp. 229–232, ISBN 978-0878421473
Geologic stratigraphic column of strata exposed in and near the Grand Canyon. The term Great Unconformity is frequently applied to the unconformity observed by John Wesley Powell in the Grand Canyon in 1869. [1] It is an exceptional example of relatively young sedimentary rock strata overlying much older sedimentary or crystalline strata.
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