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In fact the youngest formation seen in the Zion area is the oldest exposed formation in Bryce Canyon – the Dakota Sandstone. There are, however, shared rock units between all three, creating a super-sequence of formations that geologists call the Grand Staircase. Bryce Canyon's formations are the youngest known units in the Grand Staircase.
The Grand Staircase is an immense sequence of sedimentary rock layers that stretch south from Bryce Canyon National Park through Zion National Park and into the Grand Canyon. Within this sequence, the oldest exposed formation in the Zion and Kolob canyons area is the youngest exposed formation in the Grand Canyon—the Kaibab limestone. [2]
The Grand Staircase is a sequence of sedimentary rock layers, first defined in the 1870s, that stretch south for 100 miles (160 km) from Bryce Canyon National Park through Zion National Park and into the Grand Canyon. [1] Bryce Canyon is located within the Pink Cliffs, the highest and youngest rise within the Grand Staircase. [2] [3]
However, Dakota Sandstone is everywhere a common informal name for the unit, especially for the sandstone beds. [11] The Dakota Group rank is employed along the territory of the Dakota Hogback in Colorado and Wyoming, the Colorado Plateau, [4] the Dry Cimarron River, [4] and the Denver Basin. This group ranking recognizes sequences and members ...
A supersequence of these rocks is exposed in the various cliffs and canyons (including the Grand Canyon) that make up the Grand Staircase. Increasingly younger east–west trending escarpments of the Grand Staircase extend north of the Grand Canyon and are named for their color: Chocolate Cliffs, Vermillion Cliffs, White Cliffs, Gray Cliffs ...
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David Urmann, Trail Guide to Grand Staircase–Escalante (Gibbs Smith, 1999) ISBN 0-87905-885-4; Robert B. Keiter, Sarah B. George and Joro Walker (editors), Visions of the Grand Staircase–Escalante: Examining Utah's Newest National Monument (Utah Museum of Natural History and Wallace Stegner Center, 1998) ISBN 0-940378-12-4
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