| Tanner Graben | |
|---|---|
 View north, upriver, Temple and Chuar Buttes, on west bank of Colorado River, East Rim to photo right, and extending to center, top. Black Cardenas Basalt of Tanner Graben, at photo bottom-left, with layered Nankoweap Formation at Tanner Graben prominence. (Mile 68.5, Colorado River) | |
| Highest point | |
| Elevation | 4,200 ft (1,300 m)– Lava Butte (Grand Canyon), 4,242 feet (1,293 m) |
| Coordinates | 36°06′14″N 111°50′02″W / 36.10389°N 111.83389°W |
| Geography | |
  Tanner_Graben Location in Arizona (confluence of the Colorado and Little Colorado rivers) | |
| Location | Grand Canyon, Colorado River, Mile 68.5, Desert View, (East Rim) |
| Settlement | Desert View, Arizona |
| Geology | |
| Mountain type | Nankoweap Formation-(prominence), Cardenas Basalt & Dox Formation |
Located directly downstream of the Little Colorado River confluence with the Colorado River, the Tanner Graben, in the Grand Canyon, Arizona, US is a prominence and cliffside rock formation below the East Rim. Tanner Graben is located riverside, on the Colorado River, on a north-northwest bank at Mile 68.5, and lies opposite Tanner Canyon. The Tanner Rapid, created by Tanner Creek lies at the riverside foot of the graben. The graben is a pronounced feature because of the black Cardenas Basalt that forms the middle section of the graben, presumably free of debris accumulation by its cliff face steepness, and winds, and airflow drainage that course through the Colorado River's canyons; unprotected side canyons of Cardenas Basalt show accumulations as a slope-forming geologic unit, with little showing of black basalt.
The Tanner Graben sits on the Butte Fault which trends north-south up the Colorado River, and the west side of Temple Butte; it forms the east flank of Tanner Graben.[1]
Note the steepness of the graben, and lack of accumulated debris.
The Butte Fault is connected to the East Kaibab Monocline which trends north-south up the Colorado River, and turns north-northwest forming the east perimeter of the Kaibab Plateau, which lies due-north of the Tanner Graben region.[2]
- ^ Lucchitta, 2001. Hiking Arizona's Geology, Hike 3, Tanner Trail, pp. 76–82 [80–81], Photo and graphic of photo, Butte Fault, and Tanner Graben.
- ^ Chronic, Halka. Roadside Geology of Arizona, from Section: "Grand Canyon National Park", pp. 279–287. Graphic, Faults of eastern Grand Canyon show a NW-SE trend superimposed on a NE-SW trend inherited from Precambrian time. In Grand Canyon these faults can be studied in three-dimensional detail. (about 35 faults shown), p. 286.