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Morton gneiss, also known as rainbow gneiss, is an Archean-age gneiss found in the Minnesota River Valley of southwestern Minnesota, United States. It is one of the oldest stones on Earth, at about 3.5 billion years old. Along with the nearby Montevideo Gneiss, it is the oldest intact continental crust rock in the United States. [1]
River gravel is a name given to gravel composed of small pieces of rounded stone of various colors, usually no larger than a large coin. [1] It is named for the effect of many years of rounding of the edges of the stones due to a flow of water over it, as often takes place in a river . [ 2 ]
The following is a list of rock types recognized by geologists.There is no agreed number of specific types of rock. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type.
Seneca Rocks is a prominent and visually striking formation rising nearly 900 feet above the confluence of Seneca Creek with the North Fork of the South Branch of the Potomac River. It overlooks the community of Seneca Rocks, formerly known as "Mouth of Seneca". The Rocks consist of a North and a South Peak, with a central notch between.
Beacon Rock State Park is a geologic preserve and public recreation area on Route 14 in the Columbia River Gorge National Scenic Area in Skamania County, Washington, United States. The park takes its name from Beacon Rock , an 848-foot (258 m) basalt volcanic plug on the north shore of the Columbia River 32 miles (51 km) east of Vancouver .
Rocks that characterize this region include: limestone, dolomite, slate, shale, sandstone, siltstone, and some scattered basalt. Almost all of the rocks in the Great Valley in Pennsylvania are Ordovician in age and were deposited during a quiet period before the Taconic orogeny. The limestones and dolomites of this area are extensively quarried ...