, south Granite Gorge.Right of Isis peak is the southwest cliff of the ridgeline: The Colonnade, at Tiyo Point; behind Isis peak is Tiyo Point, North Rim, and the Kaibab-Toroweap-Coconino Sandstone cliff sequence-(white-dark-white), and
forested top, about 5.5-mi from Dana Butte, Tonto Trail. The prominence of Isis Temple is composed of the
Coconino Sandstone, at , (a similar elevation to the North Rim, Grand Canyon,
Kaibab Plateau, and the Coconino is geologic member no. 2 of the 4 units of
Permian age; unit 4,
Kaibab Limestone makes up the Kaibab Plateau). Below the cliff-former Coconino Sandstone is eroded,
slope-forming Hermit Shale, upon the uppermost
Supai Group 'redbeds' member the cliff-forming,
Esplanade Sandstone-(see
Tuckup Trail). After the thick sequence of 'redbeds', the cliff-forming
Redwall Limestone sits above highly eroded slopes of
Muav Limestone and
Bright Angel Shale. These slopes are deposited upon the cliff-forming unit of
Shinumo Quartzite. The Shinumo Quartzite forms the cliff-base of Isis Temple, with highly erodable units forming the slopes below, the colorful, yellows, reds, and purplish colors from the
Hakatai Shale, above the bottom
Unkar Group member,
Bass Formation-(in other photos shown as a well-bedded, grayish, multi-layered member, sitting on
Vishnu Basement Rocks, at the top of Middle Granite Gorge). The Shinumo Quartzite lies above the
slope-forming unit of the Hakatai Shale, above Bass Formation. The two slope formers can be seen as reddish, yellowish, and purplish in photographs. From the south, three colorful slope-forming sections below the Shinumo Quartzite cliffs can be observed from a distance, one each below Isis Temple and Cheops Pyramid; a lower prominence has the third slope directly upon Granite Gorge, with the intersection of Bright Angel Creek/Canyon, located at the southeast section of the uplifted fault-block, that Isis Temple and Cheops Pyramid are part of.
Tapeats Sea, Shinumo Quartzite, and Unkar Group Horst No
Tapeats Sandstone was deposited upon the Shinumo Quartzite. In the
Tapeats Sea, the
marine transgression sequence of
sandstone-(conglomerates)-shale-limestone found two 'mountain island' members, the
Cardenas Basalt (sections), and the Shinumo Quartzite, as erosion resistant 'prominences'. Only the Bright Angel Shale and Muav Limestone were deposited above the 'mountain island' prominences; Tapeats Sandstone was deposited around the 'Shinumo Quartzite island' perimeter, and can be seen in Bright Angel Canyon, west and northwest, the Phantom Creek drainage, north, and in the Trinity Creek drainage down the west perimeter, and upstream. The Isis Temple-Cheops Pyramid is part of a localized
fault-block, uplifted; (it also contains 3 sub-faults within it, parallel to the fault at its north border, Phantom Creek); the fault bordering the fault-block west, is down Trinity Creek; the fault east is the
Bright Angel Fault, down Bright Angel Canyon, and on the south (South Rim side, 'south' of Middle Granite Gorge), through Garden Creek (canyon), of the
Bright Angel Trail. The
Unkar Group, which forms the base of Isis Temple, consists of the Shinumo Quartzite, Hakatai Shale, and Bass Formation in descending order. The Unkar Group lies upon the
Vishnu Basement Rocks, which are exposed in Lower, Middle, and Upper
Granite Gorge. The Unkar Group, and other subdivisions of the (
Grand Canyon Supergroup), are tilted, about 15 degrees, as seen in photographs, or while viewing in Grand Canyon. ==List of geologic units of Isis Temple==