Stratigraphic sections of the Phosphoria formation in Idaho

McKelvey, V.E.; Davidson, D. F.; O'Malley, Frank W.; Smith, L.E.; Armstrong, Frank C.; Sheldon, R. P.

doi:10.3133/ofr5118a

Cited by 21 publications

(5 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is tempting to consider that the Bruneau area may have received phosphorus from regionally extensive bedrock source, the Phosphoria Formation, which contains abundant Ca and P. These Permian marine rocks are part of a regional stratigraphic sequence known as the Western Phosphate Field. The Phosphoria Formation, which represents shallow subtidal to intertidal deposition, originating at least in part from intertidal oolitic shoals, has been studied in detail [48][49][50][51]. Because present-day surface outcrops of the Phosphoria Formation in Idaho are restricted to the eastern part of the state, it is doubtful this could be the source of phosphorus in the deposits at Bruneau Woodpile.…”

Section: Source Of Phosphorusmentioning

confidence: 99%

The Bruneau Woodpile: A Miocene Phosphatized Fossil Wood Locality in Southwestern Idaho, USA

et al. 2017

View full text Add to dashboard Cite

Abstract:The Bruneau Woodpile site has long been popular among fossil collectors; however, the deposit has received scant attention from scientists. Our research reveals that the fossilized wood was deposited ca. 6.85 Ma, within the Chalk Hills Formation, and was mineralized with carbonate-fluorapatite. The diverse assemblage of conifers and hardwoods is representative of the warm temperate forests that flourished in southwest Idaho, USA during the late Miocene. Limb and trunk fragments preserved in a single thin sandstone bed appear to represent woody debris that was transported by streams. One possible explanation is that wood, pumice, and sandy volcaniclastic sediment arrived separately as a result of ordinary stream action, and later were combined into a single assemblage during a subsequent high-energy sedimentation event. We favor an alternate hypothesis: a catastrophic event (e.g., a windstorm) damaged trees on slopes bordering the ancient lake. Branches and small trunk fragments were carried by wind and rain into local streams and ponds where they became waterlogged. After a delay that allowed pumice and wood to become saturated, storm water transported these materials, along with finer volcaniclastic sediment, into a lake. The resulting density current produced a fining-upward sedimentary cycle where wood was preserved in the lowest, coarsest stratum.

show abstract

Section: Source Of Phosphorusmentioning

confidence: 99%

The Bruneau Woodpile: A Miocene Phosphatized Fossil Wood Locality in Southwestern Idaho, USA

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Mansfield's 1912 trenches were reopened and resampled (trench #1232) as a part of the overall study of the Western Phosphate Field in 1948 (McKelvey, Armstrong, Gulbrandsen, and Campbell, 1953). In 1975, Rioux and others mapped several additional trenches in the vicinity of the future Lanes Creek Mine including 3 sites within the boundaries of the future mine.…”

Section: Lanes Creek Minementioning

confidence: 99%

A history of phosphate mining in southeastern Idaho

Lee¹

2000

Open-File Report

View full text Add to dashboard Cite

“…The interpretation of the chemical data has been given by McKelvey, Davidson, O'Malley, and Smith (1953) and is summarized here. Nearly all the phosphate is in carbonate-fluorapatite, which has a composition of about 9CaO-3P2O5 , CaF2.CO2 -H2O.…”

Section: Interpretation Of Chemical Datamentioning

confidence: 99%

Physical stratigraphy and mineral resources of Permian rocks in western Wyoming

Sheldon¹

1963

Professional Paper

Self Cite

View full text Add to dashboard Cite

Areal variation of lithic character._-___-__-___ 64 Phosphoria formation.__________________________ 74 Lower chert member. _______________________ 74 Meade Peak phosphatic shale member.________ 74 Petrography-__________________________ 75 Areal variation of thickness-_____________ 82 Areal variation of lithic types-___________ 82 Vertical variation of lithic types-_________ 83 Correlation of beds within the Meade Peak phosphatic shale member-____-____-_-. 83 Stratigraphic relations__________________ 84 Rex chert member._________________________ 84 Lithic character._______________________ 84 Areal variation of thickness-__-_-_____--. 86 Areal and vertical variation of lithic character. _________________________________ 86 Stratigraphic relations.__.-__-____-_____-86 Retort phosphatic shale member.__-_____-_.__ 86 Lithic character._______________________ 87 Areal variation of thickness-_____________ Page TABLE 1. Location, name, lot number, and source of stratigraphic sections used in this report_______________________ 2. Lithologic constitution in percent and total thickness of rocks of the geosyncline and craton in western Wyoming and adjacent areas-__ _ _ _ _ _ _.________________ _ _ ________________________________________________ 3. Optical properties of several apatites from the Permian rooks of western Wyoming._____._________________ 4. Size parameters of phosphorites ____________________________________________________________________ ,",. Analysis of variance of Po()5 values of four sets of spheroidal phosphorites subdivided by maximum spheroid size__________ ________________________________________________________________________________ 6. Distribution of minor minerals in rock cycle. ____________________________________________________ 7-11. Thickness and grade of phosphatic and uraniferous beds: 7. Used in calculations of phosphate reserves and uranium resources in the Gros Ventre Range, Wyo_____ 8. Of the Retort phosphatic shale tongue used in calculations of phosphate reserves and uranium resources in the Wind River Range, Wyo__-________--_________-__----_-__---_-___----______-___________ 9. Of the Meade Peak phosphatic shale tongue used in calculations of phosphate reserves and uranium resources in the Wind River Range, Wyo._____________________________________________________ 10. Used in calculations of phosphate reserves and uranium resources in the Big Hole, Teton, Snake River, and Caribou Ranges, Wyoming and Idaho___________________________________________________ 11. Used in calculations of phosphate reserves and uranium resources in the Hoback and Wyoming Ranges, Wyo________________ ______________________________________________________________ 12-19. Phosphate reserves:

show abstract

Stratigraphic sections of the Phosphoria formation in Idaho

Cited by 21 publications

References 2 publications

The Bruneau Woodpile: A Miocene Phosphatized Fossil Wood Locality in Southwestern Idaho, USA

The Bruneau Woodpile: A Miocene Phosphatized Fossil Wood Locality in Southwestern Idaho, USA

A history of phosphate mining in southeastern Idaho

Physical stratigraphy and mineral resources of Permian rocks in western Wyoming

Contact Info

Product

Resources

About