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The sandstones are the Tonganoxie Sandstone Member of the Stranger Formation and the Ireland Sandstone Member of the Lawrence Formation. The hills occur in the western portions of Montgomery, Wilson and Woodson counties and the eastern edges of Chautauqua, Elk and Greenwood counties. The sandstones continue into northern Oklahoma. Flint Hills
Oldest dated rocks. A sample of gneiss from the site of the Earth's oldest dated rocks (the Acasta River area of Canada). This sample has been dated at 4.03 billion years old. The Moon rock "Big Bertha", collected on the 1971 Apollo 14 mission, contains an Earth meteorite that is 4 billion years old. The oldest dated rocks formed on Earth, as ...
The geology of South Dakota began to form more than 2.5 billion years ago in the Archean eon of the Precambrian. Igneous crystalline basement rock continued to emplace through the Proterozoic, interspersed with sediments and volcanic materials. Large limestone and shale deposits formed during the Paleozoic, during prevalent shallow marine ...
Dakota Sandstone (Lower Cretaceous) Dakota Sandstone. Mountains continued to rise in the Sevier orogenic belt to the west during the Cretaceous while the roughly north-south trending Western Interior Basin expanded. Rifting in the Gulf of Mexico helped the southern end of the basin to subside, which allowed marine water to advance northward. At ...
Photographs of the American West, Boston Public Library. The Book Cliffs are a series of desert mountains and cliffs in western Colorado and eastern Utah in the Western United States. [1] They are so named because the cliffs of Cretaceous sandstone capping many of the south-facing buttes appear similar to a shelf of books.
San Juan Basin Upper Cretaceous stratigraphy. The Lewis Shale is an olive-gray marine shale with some thin beds of claystone, siltstone, sandstone, and limestone. It was deposited in the Western Interior Seaway in the late Cretaceous. [1] The formation crops out in the Bighorn Basin, Green River Basin, Powder River Basin, San Juan Basin, and ...
The Wave is a sandstone rock formation located in Arizona, US, near its northern border with Utah. The formation is situated on the slopes of the Coyote Buttes in the Paria Canyon-Vermilion Cliffs Wilderness of the Colorado Plateau. The area is administered by the Bureau of Land Management (BLM) at the Grand Staircase–Escalante National ...
The Morrison Formation is a distinctive sequence of Upper Jurassic sedimentary rock found in the western United States which has been the most fertile source of dinosaur fossils in North America. It is composed of mudstone, sandstone, siltstone, and limestone and is light gray, greenish gray, or red. Most of the fossils occur in the green ...