Phosphoria Formation
Geologic formation in the northwestern United States / From Wikipedia, the free encyclopedia
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The Phosphoria Formation of the western United States is a geological formation of Early Permian age.[4] It represents some 15 million years of sedimentation, reaches a thickness of 420 metres (1,380 ft) and covers an area of 350,000 square kilometres (140,000 sq mi).[1]
Quick Facts Type, Underlies ...
Phosphoria Formation | |
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Stratigraphic range: Early Permian | |
Type | Geological formation |
Underlies | Dinwoody Formation |
Overlies | Casper Formation, Park City Formation, Tensleep Sandstone |
Area | 350,000 sq. km (140,000 sq. mi)[1] |
Thickness | Up to 420 metres (1,380 ft)[1] |
Lithology | |
Primary | Limestone, dolomite, shale |
Other | Chert, phosphorite, sandstone |
Location | |
Region | Idaho, Montana, Utah, Wyoming[2] |
Country | USA |
Type section | |
Named for | Phosphoria Gulch, Idaho |
Named by | Richards and Mansfield, 1912[3] |
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The Phosphoria includes phosphorite beds that are an important source of phosphorus.[5] Many of its shales are rich in organic matter and are petroleum source rocks,[6] and some of its dolomites include petroleum reservoirs.[7]