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What Is the Grand Staircase?

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What Is the Grand Staircase? What is the Grand Staircase? This staircase is like no other. More than six thousand vertical feet of alternating cliffs, slopes, and terraces make up this giant stair- case, which extends horizontally about 150 miles from the north rim of the Grand Canyon in northern Arizona to the top of the Paunsaugunt Plateau in southern Utah. The eastern margin of the Grand Staircase is marked by the East Kaibab monocline, com- monly known as The Cockscomb, and the western margin is generally considered to be the Hurricane Cliffs. Each “riser” is a cliff or slope as much as 2,000 feet high and each “tread” is a plateau, terrace, or flat that is as much as 15 miles wide. The origin of the name “Grand Staircase” is uncertain, although early explorers like Clarence Dutton described this area as being “like a great stairway” in the 1880s. A generalized outline of the Grand Staircase. Capitol ° Waterpocket 38 Reef UTAH A classic portion of the staircase is within the Nat'l. IUS UAR Park western part of the Grand Staircase-Escalante AQ ESCALANTE PLATEAUEscalante National Monument in southern Utah. The Dixie National CANYON Fold Bryce Forest REGION alternating configuration of cliffs, terraces, and PLATEAU Canyon Glen PAUNSAUGUNT Straight Cliffs Nat'l. slopes is due to the varied erosion rates of dif- Garfield Co. Park Canyon ferent rock types. Harder rocks, such as sand- Kane 37°30' Co. Henrieville Fiftymile Bench stone and limestone, erode slowly and make up KAIPAROWITS Nat'l. the cliffs and terraces. Softer rocks, such as REGION shale and siltstone, erode faster and make up GRAND The Cockscomb the slopes. STAIRCASE Recreation REGION Area Good viewing spots of the entire staircase are Lake UTAH Powell hard to come by. One of the best is south of 37° ARIZONA Kanab, Utah along Route 89A in Arizona. 112°30' 112° 111°30' 111° Otherwise, portions of the treads and terraces 10 0 10 20 30 40 mi are visible east and north of Kanab. 10 0 10 2030 40 50 km The northeastern part of the Grand Staircase is one of the three regions within the Grand Staircase- Escalante National Monument in southern Utah. Climbing the Grand Staircase GEOLOGIC Lake environment MILLION TIME FORMATION Beach and ocean environment YEARS AGO PERIOD NAMES Cinder cones PAUNSAUGUNT PLATEAU Lava fields Sinkhole PINK CLIFFS River-lake environment PODUNK TERRACE STRAIGHT CLIFFS Coal beds Coal swamps GRAY CLIFFS SKUTUMPAH TERRACE Desert environment Temple Cup WHITE CLIFFS white pink brown Ocean environment WYGARET TERRACE VERMILION CLIFFS River environment SHINARUMP FLATS petrified forest CHOCOLATE CLIFFS KAIBAB PLATEAU Gypsum A profile of a portion of the Grand Staircase in southern Utah and northern Arizona Kaibab Plateau: the southern and lowermost tread forms the north rim of the Grand Canyon in Arizona and extends northward into Utah. Kaibab Formation limestones. Chocolate Cliffs: the first major riser is made of chocolate brown-colored siltstones and sandstones of the Moenkopi Formation. Forms a slope below the more resistant cap of light gray conglomerates and sandstones of the Shinarump Member of the Chinle Formation. Shinarump Flats: upper portion of the Shinarump Member. Above the flats are slopes of bright red, pink, brown, purple, white, yellow, and gray-green mudstones and sandstones of the Chinle Formation. Vermilion Cliffs: red to reddish-orange sandstones of the Moenave and Kayenta Formations. Wygaret Terrace: a narrow tread dotted with sandstone buttes and monuments. Upper Kayenta Formation. White Cliffs: white, pink, and brown Navajo Sandstone. Cliffs are capped by the Temple Cap Sandstone - a cliff- and terrace- forming unit of white to grayish-pink sandstone. Skutumpah Terrace: Carmel Formation limestones. Slopes above the terrace are red to brown siltstones and sandstones and white gypsum of the Carmel Formation. Gray Cliffs: gray to nearly black mudstone, coal, shale, and sandstone of the Dakota Formation. Podunk Terrace: slopes and cliffs of sandstones, siltstones, and shales of the Tropic Shale and Straight Cliffs, Wahweap, and Kaiparowits Formations. The Straight Cliffs riser is tan to buff sandstone and mudstone. Pink Cliffs: uppermost riser, pink- and red-colored Claron Formation limestones. Classic viewpoint in Bryce Canyon National Park. Paunsaugunt Plateau: uppermost tread of the staircase. Plateau is sporadically covered with basalts and sediments. Public Information Series 64 UTAH GEOLOGICAL SURVEY a division of Utah Department of Natural Resources UTAH GEOLOGICAL SURVEY.
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