Phosphoria Formation

Phosphoria Formation
Phosphoria Formation
; Stratigraphic range:
	An outcrop of the Phosphoria Formation near the Big Hole River in western Montana.
Type	Geological formation
Underlies	Dinwoody Formation
Overlies	Casper Formation, Park City Formation, Tensleep Sandstone
Area	350,000 sq. km (140,000 sq. mi)
Thickness	Up to 420 metres (1,380 ft)
Lithology
Primary	Limestone, dolomite, shale
Other	Chert, phosphorite, sandstone
Location
Region	Idaho, Montana, Utah, Wyoming
Country	USA
Type section
Named for	Phosphoria Gulch, Idaho
Named by	Richards and Mansfield, 1912

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]

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]

^ ^a ^b ^c Blatt, Harvey and Robert J. Tracy, Petrology, Freeman, 1996, 2nd ed. pp. 345-349 ISBN 0-7167-2438-3
^ Cite error: The named reference USGS was invoked but never defined (see the help page).
^ Richards, R.W., and Mansfield, G.R., 1912, The Bannock overthrust; a major fault in southeastern Idaho and northeastern Utah: Journal of Geology, v. 20, no. 8, p. 681-709.
^ Behnken, F.H., Wardlaw, B.R. and Stout, L.N., 1986, Conodont biostratigraphy of the Permian Meade Peak Phosphatic Shale Member, Phosphoria Formation, southeastern Idaho. University of Wyoming Contributions to Geology, v. 24, no. 2, p. 169-190.
^ Cite error: The named reference McKelvey was invoked but never defined (see the help page).
^ Cite error: The named reference Maughan was invoked but never defined (see the help page).
^ Cite error: The named reference Campbell was invoked but never defined (see the help page).

[Blatt-1] Blatt, Harvey and Robert J. Tracy, Petrology, Freeman, 1996, 2nd ed. pp. 345-349 ISBN 0-7167-2438-3

[USGS-2] Cite error: The named reference USGS was invoked but never defined (see the help page).

[Richards-3] Richards, R.W., and Mansfield, G.R., 1912, The Bannock overthrust; a major fault in southeastern Idaho and northeastern Utah: Journal of Geology, v. 20, no. 8, p. 681-709.

[Behnken-4] Behnken, F.H., Wardlaw, B.R. and Stout, L.N., 1986, Conodont biostratigraphy of the Permian Meade Peak Phosphatic Shale Member, Phosphoria Formation, southeastern Idaho. University of Wyoming Contributions to Geology, v. 24, no. 2, p. 169-190.

[McKelvey-5] Cite error: The named reference McKelvey was invoked but never defined (see the help page).

[Maughan-6] Cite error: The named reference Maughan was invoked but never defined (see the help page).

[Campbell-7] Cite error: The named reference Campbell was invoked but never defined (see the help page).

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Phosphoria Formation
Stratigraphic range:
An outcrop of the Phosphoria Formation near the Big Hole River in western Montana.
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]