Phosphoria Formation
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The Phosphoria Formation of the western United States is a geological formation of Early Permian age. It represents some 15 million years of sedimentation, reaches a thickness of 420 metres and covers
An outcrop of the Phosphoria Formation near the Big Hole River in western Montana.
Tooth whorl of Helicoprion from the Phosphoria Formation
A phosphorite mine near Flaming Gorge, Utah, in 2008.
Peloidal phosphorite from the Phosphoria Formation, Simplot Mine, Idaho. 4.6 cm wide.
Phosphorite
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Phosphorite, phosphate rock or rock phosphate is a non-detrital sedimentary rock that contains high amounts of phosphate minerals. The phosphate content of phosphorite varies greatly, from 4% to 20% p
Phosphoria Formation
…sedimentation, reaches a thickness of 420 metres (1,380 ft) and covers an area of 350,000 square kilometres (140,000 sq mi). The Phosphoria includes phosphorite beds that are an important source of phosphorus. Many of its shales are rich in organic matter and are petroleum source rocks, and some of its dolomites…
Fossiliferous peloidal phosphorite, (4.7 cm across), Yunnan, China.
Shelly phosphorite from Estonia
Guano phosphorite mining in the Chincha Islands of Peru, c. 1860