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Figure 1. A geologic cross section of the Grand Canyon.
Figure 1. A geologic cross section of the Grand Canyon.
The Permian through Jurassic strata of the Colorado Plateau area of southeastern Utah demonstrate the principles of stratigraphy. These strata make up
The Permian through Jurassic strata of the Colorado Plateau area of southeastern Utah demonstrate the principles of stratigraphy. These strata make up much of the famous prominent rock formations in widely spaced protected areas such as Capitol Reef National Park and Canyonlands National Park. From top to bottom: Rounded tan domes of the Navajo Sandstone, layered red Kayenta Formation, cliff-forming, vertically jointed, red Wingate Sandstone, slope-forming, purplish
Uluru (Ayers Rock) in Australia is underlain by the Mutitjulu Arkose, a formation composed almost entirely of a single lithology (arkosic sandstone).
Uluru (Ayers Rock) in Australia is underlain by the Mutitjulu Arkose, a formation composed almost entirely of a single lithology (arkosic sandstone).
The Summerville Formation is composed of alternating thin beds of two lithologies, mudstone and sandstone, penetrated by veins of a third lithology, g
The Summerville Formation is composed of alternating thin beds of two lithologies, mudstone and sandstone, penetrated by veins of a third lithology, gypsum.
Summerville Formation at the type locality at Summerville Point, east side of the San Rafael Swell, Emery County, Utah
Summerville Formation at the type locality at Summerville Point, east side of the San Rafael Swell, Emery County, Utah
Evenly bedded Summerville Formation exposed along Utah Highway 24, 2.4 miles west of Hanksville, Utah
Evenly bedded Summerville Formation exposed along Utah Highway 24, 2.4 miles west of Hanksville, Utah
Closeup of the Summerville Formation showing even bedding, 2.4 miles west of Hanksville, Utah.
Closeup of the Summerville Formation showing even bedding, 2.4 miles west of Hanksville, Utah.
Summerville Formation with gypsum-filled cracks. U.S. quarter dollar (24 mm) for scale
Summerville Formation with gypsum-filled cracks. U.S. quarter dollar (24 mm) for scale