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Geologic stratigraphic column of strata exposed in and near the Grand Canyon. Of the many unconformities (gaps) observed in geological strata, the term Great Unconformity is frequently applied to either the unconformity observed by James Hutton in 1787 at Siccar Point in Scotland, [1] [failed verification] or that observed by John Wesley Powell in the Grand Canyon in 1869. [2]
An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous. In general, the older layer was exposed to erosion for an interval of time before deposition of the younger layer, but the term is used to describe any break in the ...
James Hutton FRSE ( / ˈhʌtən /; 3 June O.S. [1] 1726 – 26 March 1797) was a Scottish geologist, agriculturalist, chemical manufacturer, naturalist and physician. [2] Often referred to as the "Father of Modern Geology," [3][4] he played a key role in establishing geology as a modern science. Hutton advanced the idea that the physical world ...
Los Angeles Basin. The Los Angeles Basin is a sedimentary basin located in Southern California, in a region known as the Peninsular Ranges. The basin is also connected to an anomalous group of east-west trending chains of mountains collectively known as the Transverse Ranges. The present basin is a coastal lowland area, whose floor is marked by ...
Hutton's Unconformity is a name given to various notable geological sites in Scotland identified by the 18th-century Scottish geologist James Hutton as places where the junction between two types of rock formations can be seen. This geological phenomenon marks the location where rock formations created at different times and by different ...
In the Grand Canyon, the Bright Angel Shale is typically a heterogenous, sometimes fossiliferous, mixture of interbedded shale, mudstone, siltstone, fine-grained sandstone, and isolated beds of limestone. The dominant lithology within the Bright Angel Shale is greenish shale that is composed largely of illite and varying amounts of chlorite and ...
The geology of the Grand Canyon area includes one of the most complete and studied sequences of rock on Earth. The nearly 40 major sedimentary rock layers exposed in the Grand Canyon and in the Grand Canyon National Park area range in age from about 200 million to nearly 2 billion years old. Most were deposited in warm, shallow seas and near ...
Sep. 5—A new study led by University of Colorado Boulder researchers sheds light on one of the world's great geological mysteries: a missing chapter of the earth's rock record known as the Great ...