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Orphan Mine (Orphan lode; Orphan N.P. 2004; Golden Crown Mining Co. property; Western Gold and Uranium property), Grand Canyon Village, Orphan District, South Rim, Coconino Co., Arizona, USAi
Regional Level Types
Orphan Mine (Orphan lode; Orphan N.P. 2004; Golden Crown Mining Co. property; Western Gold and Uranium property)Mine
Grand Canyon VillageVillage
Orphan DistrictMining District
South Rim- not defined -
Coconino Co.County
ArizonaState
USACountry

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Key
Lock Map
Latitude & Longitude (WGS84): 36° 4' North , 112° 9' West
Latitude & Longitude (decimal): 36.06667,-112.15000
GeoHash:G#: 9w2jpvwze
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate
Nearest Settlements:
PlacePopulationDistance
Grand Canyon1,460 (2018)1.7km
Grand Canyon Village1,550 (2006)2.3km
Tusayan567 (2017)10.6km
Valle832 (2011)45.9km


‡Ref.: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 127, 162, 285, 298, 340, 351, 371, 407, 408, 409; Isachsen, Y.T., et al (1955), Age and sedimentary environments of uranium host rocks, Colorado Plateau, Econ.Geol.: 50: 127-134; Gornitz, V. (1986), Uranium mineralization at the Orphan mine breccia pipe, Grand Canyon, AZ (abs.), Geol. Soc. Amer. Abs. with Progs.: 18: 357; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 1 & 3-5; Gornitz, V. & P.F. Kerr (1970), Uranium mineralization and alteration, Orphan Mine, Grand Canyon, AZ, Econ.Geol.: 65: 751-768; Gornitz, V., et al (1988), Origin of the Orphan Mine breccia pipe uranium deposit, Grand Canyon, AZ, Process Mineralogy VII: Applications to Mineral Benficiation Technology and Mineral Exploration, A.H. Vassiliou, Hausen, D.M., and Carson, D.J.T., editors, The Metallurgical Society, Warrendale, PA: 281-301; Wenrich, K.J., et al (1989), Uranium in AZ, in: Geologic evolution of Arizona, J.P. Penney and S.J. Reynolds, editors, AZ Geol. Soc. Digest 17, Tucson: 759-794; Wenrich, K.J., et al (1992), USGS Bull. 1683-D: D2; Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in AZ, USGS Bull. 1147-A, A7-A12; Chenoweth, W.L. (1986), The Orphan Lode mine, Grand Canyon, AZ, a case history of a mineralized collapse-breccia pipe, USGS Open File Rept 86-510; Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, AZ Dept. Mines & Min. Resources Open File Rept. 92-10: 6 (Table 1); Keith (1970) AZ Bur. Mines Bull. 182: 103-159, 202-289; Kofford (1969), Four Corners Geol. Soc. Guidebook: 190-194; Bowles (1977), USGS Circ. 753: 25-27; US Bur. Land Management Mining District sheet 62; US Atomic Energy Comm. Prelim. Rpt. 172-479: 2, 8, 9; AZ Dept. Min. Resources Orphan Mine file; Adler, H., EconGeol.: 58(6): 849-850.

A former underground U-Cu mine with minor & trace commodities of Sb-Pb-Co-Au-Mn-Zn-Ag-Mo & baryte, located in the N½ sec. 14, T.31N., R.2E. (Bright Angel 15 minute topo map), 2 miles west of Grand Canyon Village on the South Rim of the canyon itself, immediately West of Maricopa Point. Discovered by Daniel L. Hogan in 1893 as a copper claim and dubbed the 'Orphan lode' by him. Converted to an uranium mine in 1956 and closed in 1969. Owned by Western Gold & Uranium, Inc.

Local rocks are Pennsylvanian and Permian. Mineralization involves an ellipsoidal, pipelike body of collapse breccia developed primarily in the Permian Coconino Sandstone (and Mescal limestone) associated with pyrite and other sulfides and sulfosalts of Cu-Pb-Zn-Co-Ni & Mo, and includes secondary copper minerals. Ore is disseminations and stringers on the pipe's periphery. Bleaching, argillization and carbonization extend into sediments as a function of permeablity. Concentration process was bacteriological mobilization and enrichment of deposits from hydrothermal fluids.Strongest mineralization in most permeable areas around the periphery of the pipe.

Workings include 3 small, original workings, including a main adit. The middle working has a main adit about 25 feet long and about 15 feet of workings branching off. The lower working adit is about 45 feet long, turns and goes an additional 25 feet. There is a 1,600 foot deep shaft and crosscut more than 800 feet long.

Production for the period 1956-1969 was 4,260,000 pounds of U3O8, plus 6,680,000 pounds of Cu, 107,000 oz. Ag and 3,400 pounds of V2O5.

Regions containing this locality

North America PlateTectonic Plate
Grand Canyon National Park, Arizona, USANational Park

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


65 valid minerals.

Detailed Mineral List:

'Albite-Anorthite Series'
Reference: MRDS database file No. 10027053.
Alum-(K)
Formula: KAl(SO4)2 · 12H2O
Reference: Anatoly Kasatkin analyses
Anglesite
Formula: PbSO4
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Anhydrite
Formula: CaSO4
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Aragonite
Formula: CaCO3
Reference: MRDS database file No. 10027053.
Arsenopyrite
Formula: FeAsS
Description: Occurs as impregnations in sandstone - lower adit.
Reference: Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in AZ, USGS Bull. 1147-A, A7-A12; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Azurite
Formula: Cu3(CO3)2(OH)2
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 285; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7..
Baryte
Formula: BaSO4
Habit: Coarse crystals
Colour: Yellow
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 127, 298; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7..
Bieberite
Formula: CoSO4 · 7H2O
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Bornite
Formula: Cu5FeS4
Description: Rimmed by chalcopyrite or with chalcopyrite grains oriented bladed along (100) bornite cleavages.
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 1 & 3-5, 7.
'Bravoite'
Formula: (Fe,Ni)S2
Description: As cores of cubic pyrite crystals with siegenite.
Reference: Gornitz, V., et al (1988), Origin of the Orphan Mine breccia pipe uranium deposit, Grand Canyon, AZ, Process Mineralogy VII: Applications to Mineral Benficiation Technology and Mineral Exploration, A.H. Vassiliou, Hausen, D.M., and Carson, D.J.T., editors, The Metallurgical Society, Warrendale, PA: 281-301; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 1 & 3-5, 7
Brochantite
Formula: Cu4(SO4)(OH)6
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Calcite
Formula: CaCO3
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Carnotite
Formula: K2(UO2)2(VO4)2 · 3H2O
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Cerussite
Formula: PbCO3
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Chalcanthite
Formula: CuSO4 · 5H2O
Description: Occurs as efflorescences - lower adit.
Reference: Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in AZ, USGS Bull. 1147-A, A7-A12.
Chalcocite
Formula: Cu2S
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 162; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 1 & 3-5, 7..
Chalcopyrite
Formula: CuFeS2
Description: Occurs as impregnations in sandstone - lower adit; also disseminated grains, oriented bladed along (100) bornite cleavages, and as rims around bornite.
Reference: Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in AZ, USGS Bull. 1147-A, A7-A12; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 1 & 3-5, 7..
Chrysocolla
Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Reference: Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in AZ, USGS Bull. 1147-A, A7-A12.
Copper
Formula: Cu
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Covellite
Formula: CuS
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 5, 7.
Digenite
Formula: Cu9S5
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 1 & 3-5, 7.
Dolomite
Formula: CaMg(CO3)2
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Enargite
Formula: Cu3AsS4
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Erythrite
Formula: Co3(AsO4)2 · 8H2O
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Galena
Formula: PbS
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Gersdorffite
Formula: NiAsS
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Goethite
Formula: α-Fe3+O(OH)
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Gypsum
Formula: CaSO4 · 2H2O
Description: On adit walls with efflorescent Fe & Cu minerals.
Reference: Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in AZ, USGS Bull. 1147-A, A7-A12; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7..
Halotrichite
Formula: FeAl2(SO4)4 · 22H2O
Reference: Anatoly Kasatkin analyses
Hematite
Formula: Fe2O3
Description: As impregnations in sandstone - lower adit.
Reference: Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in AZ, USGS Bull. 1147-A, A7-A12; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7..
Hexahydrite
Formula: MgSO4 · 6H2O
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Ilsemannite
Formula: Mo3O8 · nH2O
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Jarosite
Formula: KFe3+ 3(SO4)2(OH)6
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Kaolinite
Formula: Al2(Si2O5)(OH)4
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Laumontite
Formula: CaAl2Si4O12 · 4H2O
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 285; Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in AZ, USGS Bull. 1147-A, A7-A12; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7..
Marcasite
Formula: FeS2
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Metatorbernite
Formula: Cu(UO2)2(PO4)2 · 8H2O
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Metazeunerite
Formula: Cu(UO2)2(AsO4)2 · 8H2O
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Millerite
Formula: NiS
Description: Occurs in cavities in barite.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 298; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7..
Molybdenite
Formula: MoS2
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Muscovite var: Illite
Formula: K0.65Al2.0[Al0.65Si3.35O10](OH)2
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Nickeline
Formula: NiAs
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Pararammelsbergite
Formula: NiAs2
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Pyrite
Formula: FeS2
Description: Associated with Cu-U-Pb ores in Coconino Sandstone. Most abundant sulfide mineral. Early stage = finely-disseminated, strongly-zoned cubes, with cores of bravoite and siegenite. Later stage of massive, often highly-fractured material.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 340; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 1 & 3-5, 7; Isachsen, Y.T., et al (1955), Age and sedimentary environments of uranium host rocks, Colorado Plateau, Econ.Geol.: 50: 127-134; Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in AZ, USGS Bull. 1147-A, A7-A12; Gornitz, V., et al (1988), Origin of the Orphan Mine breccia pipe uranium deposit, Grand Canyon, AZ, Process Mineralogy VII: Applications to Mineral Benficiation Technology and Mineral Exploration, A.H. Vassiliou, Hausen, D.M., and Carson, D.J.T., editors, The Metallurgical Society, Warrendale, PA: 281-301.
Pyrolusite
Formula: Mn4+O2
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Quartz
Formula: SiO2
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Quartz var: Chalcedony
Formula: SiO2
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Rameauite
Formula: K2Ca(H[3]2O)(H[5]2O)4[(UO2)6O6(OH)4](H[4]2O)
Description: Occurs among ores.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 351; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7..
Rammelsbergite
Formula: NiAs2
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 351; Gornitz, V. (1986), Uranium mineralization at the Orphan mine breccia pipe, Grand Canyon, AZ (abs.), Geol. Soc. Amer. Abs. with Progs.: 18: 357; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7..
Rhodochrosite
Formula: MnCO3
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Siderite
Formula: FeCO3
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Siegenite
Formula: CoNi2S4
Description: As cores of cubic pyrite crystals with bravoite.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 371; Gornitz, V., et al (1988), Origin of the Orphan Mine breccia pipe uranium deposit, Grand Canyon, AZ, Process Mineralogy VII: Applications to Mineral Benficiation Technology and Mineral Exploration, A.H. Vassiliou, Hausen, D.M., and Carson, D.J.T., editors, The Metallurgical Society, Warrendale, PA: 281-301; .
Skutterudite
Formula: CoAs3
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Smithsonite
Formula: ZnCO3
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Sphalerite
Formula: ZnS
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Tennantite
Formula: Cu6[Cu4(Fe,Zn)2]As4S13
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Torbernite
Formula: Cu(UO2)2(PO4)2 · 12H2O
Description: Occurs in a vertical shear zone at portal of lower adit.
Reference: Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in AZ, USGS Bull. 1147-A, A7-A12; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7..
Tyuyamunite
Formula: Ca(UO2)2(VO4)2 · 5-8H2O
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Uraninite
Formula: UO2
Description: Occurs fairly pure as disseminations and as veins & lenses up to several inches thick; as thin coatings around quartz grains; botryoidal clusters in massive ore.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 407; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 1 & 3-5; Granger, H.C. & R.B. Raup (1962), Reconnaissance study of uranium deposits in AZ, USGS Bull. 1147-A, A7-A12.
Uranophane
Formula: Ca(UO2)2(SiO3OH)2 · 5H2O
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Uranospinite
Formula: Ca(UO2)(AsO4)2 · 10H2O
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 408; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7..
Vaesite
Formula: NiS2
Habit: Brilliant, tiny (to 2 mm diameter)
Colour: White
Description: Tiny crystals perched on coarse, yellow barite crystals.
Reference: Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 409; Anthony, Bideaux, Bladh, Nichols: "Handbook of Mineralogy", Vol. 1, 1990; Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7..
Wulfenite
Formula: Pb(MoO4)
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.
Wupatkiite ?
Formula: (Co,Mg,Ni)Al2(SO4)4·22H2O
Description: Unconfirmed - analyses by Anatoly Kasatkin showed no trace of Co; the material was a mixture of halotrichite and potassium alum (http://www.mindat.org/mesg-7-155381.html).
Reference: Richard Dale Collection
Zeunerite
Formula: Cu(UO2)2(AsO4)2 · 12H2O
Reference: Gornitz, V. (2004), Grand Canyon Uranium: The Orphan Mine, Mineral News: 20(6): 7.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Copper1.AA.05Cu
Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Bornite2.BA.15Cu5FeS4
Chalcocite2.BA.05Cu2S
Chalcopyrite2.CB.10aCuFeS2
Covellite2.CA.05aCuS
Digenite2.BA.10Cu9S5
Enargite2.KA.05Cu3AsS4
Galena2.CD.10PbS
Gersdorffite2.EB.25NiAsS
Marcasite2.EB.10aFeS2
Millerite2.CC.20NiS
Molybdenite2.EA.30MoS2
Nickeline2.CC.05NiAs
Pararammelsbergite2.EB.10eNiAs2
Pyrite2.EB.05aFeS2
Rammelsbergite2.EB.15aNiAs2
Siegenite2.DA.05CoNi2S4
Skutterudite2.EC.05CoAs3
Sphalerite2.CB.05aZnS
Tennantite2.GB.05Cu6[Cu4(Fe,Zn)2]As4S13
Vaesite2.EB.05aNiS2
Group 4 - Oxides and Hydroxides
Carnotite4.HB.05K2(UO2)2(VO4)2 · 3H2O
Goethite4.00.α-Fe3+O(OH)
Hematite4.CB.05Fe2O3
Ilsemannite4.FJ.15Mo3O8 · nH2O
Pyrolusite4.DB.05Mn4+O2
Quartz4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Rameauite4.GB.05K2Ca(H[3]2O)(H[5]2O)4[(UO2)6O6(OH)4](H[4]2O)
Tyuyamunite4.HB.25Ca(UO2)2(VO4)2 · 5-8H2O
Uraninite4.DL.05UO2
Group 5 - Nitrates and Carbonates
Ankerite5.AB.10Ca(Fe2+,Mg)(CO3)2
Aragonite5.AB.15CaCO3
Azurite5.BA.05Cu3(CO3)2(OH)2
Calcite5.AB.05CaCO3
Cerussite5.AB.15PbCO3
Dolomite5.AB.10CaMg(CO3)2
Malachite5.BA.10Cu2(CO3)(OH)2
Rhodochrosite5.AB.05MnCO3
Siderite5.AB.05FeCO3
Smithsonite5.AB.05ZnCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Alum-(K)7.CC.20KAl(SO4)2 · 12H2O
Anglesite7.AD.35PbSO4
Anhydrite7.AD.30CaSO4
Baryte7.AD.35BaSO4
Bieberite7.CB.35CoSO4 · 7H2O
Brochantite7.BB.25Cu4(SO4)(OH)6
Chalcanthite7.CB.20CuSO4 · 5H2O
Gypsum7.CD.40CaSO4 · 2H2O
Halotrichite7.CB.85FeAl2(SO4)4 · 22H2O
Hexahydrite7.CB.25MgSO4 · 6H2O
Jarosite7.BC.10KFe3+ 3(SO4)2(OH)6
Wulfenite7.GA.05Pb(MoO4)
Wupatkiite ?7.CB.85(Co,Mg,Ni)Al2(SO4)4·22H2O
Group 8 - Phosphates, Arsenates and Vanadates
Erythrite8.CE.40Co3(AsO4)2 · 8H2O
Metatorbernite8.EB.10Cu(UO2)2(PO4)2 · 8H2O
Metazeunerite8.EB.10Cu(UO2)2(AsO4)2 · 8H2O
Torbernite8.EB.05Cu(UO2)2(PO4)2 · 12H2O
Uranospinite8.EB.05Ca(UO2)(AsO4)2 · 10H2O
Zeunerite8.EB.05Cu(UO2)2(AsO4)2 · 12H2O
Group 9 - Silicates
Chrysocolla9.ED.20Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Kaolinite9.ED.05Al2(Si2O5)(OH)4
Laumontite9.GB.10CaAl2Si4O12 · 4H2O
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Illite9.EC.15K0.65Al2.0[Al0.65Si3.35O10](OH)2
Uranophane9.AK.15Ca(UO2)2(SiO3OH)2 · 5H2O
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Bravoite'-(Fe,Ni)S2
'Limonite'-(Fe,O,OH,H2O)

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Copper1.1.1.3Cu
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Chalcocite2.4.7.1Cu2S
Digenite2.4.7.3Cu9S5
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmXp, with m:p = 1:1
Covellite2.8.12.1CuS
Galena2.8.1.1PbS
Millerite2.8.16.1NiS
Nickeline2.8.11.1NiAs
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 3:4
Siegenite2.10.1.6CoNi2S4
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Gersdorffite2.12.3.2NiAsS
Marcasite2.12.2.1FeS2
Molybdenite2.12.10.1MoS2
Pararammelsbergite2.12.5.1NiAs2
Pyrite2.12.1.1FeS2
Rammelsbergite2.12.2.12NiAs2
Skutterudite2.12.17.1CoAs3
Vaesite2.12.1.2NiS2
Group 3 - SULFOSALTS
ø = 4
Enargite3.2.1.1Cu3AsS4
3 <ø < 4
Tennantite3.3.6.2Cu6[Cu4(Fe,Zn)2]As4S13
Group 4 - SIMPLE OXIDES
A2X3
Hematite4.3.1.2Fe2O3
AX2
Pyrolusite4.4.1.4Mn4+O2
Miscellaneous
Ilsemannite4.6.3.1Mo3O8 · nH2O
Group 5 - OXIDES CONTAINING URANIUM OR THORIUM
AXO2·xH2O
Uraninite5.1.1.1UO2
AX3O10·xH2O
Rameauite5.5.2.1K2Ca(H[3]2O)(H[5]2O)4[(UO2)6O6(OH)4](H[4]2O)
Group 6 - HYDROXIDES AND OXIDES CONTAINING HYDROXYL
XO(OH)
Goethite6.1.1.2α-Fe3+O(OH)
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Cerussite14.1.3.4PbCO3
Rhodochrosite14.1.1.4MnCO3
Siderite14.1.1.3FeCO3
Smithsonite14.1.1.6ZnCO3
AB(XO3)2
Ankerite14.2.1.2Ca(Fe2+,Mg)(CO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Azurite16a.2.1.1Cu3(CO3)2(OH)2
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Anglesite28.3.1.3PbSO4
Anhydrite28.3.2.1CaSO4
Baryte28.3.1.1BaSO4
Group 29 - HYDRATED ACID AND NORMAL SULFATES
AB(XO4)2·xH2O
Alum-(K)29.5.5.1KAl(SO4)2 · 12H2O
AXO4·xH2O
Bieberite29.6.10.4CoSO4 · 7H2O
Chalcanthite29.6.7.1CuSO4 · 5H2O
Gypsum29.6.3.1CaSO4 · 2H2O
Hexahydrite29.6.8.1MgSO4 · 6H2O
AB2(XO4)4·H2O
Halotrichite29.7.3.2FeAl2(SO4)4 · 22H2O
Wupatkiite ?29.7.3.7(Co,Mg,Ni)Al2(SO4)4·22H2O
Group 30 - ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
(AB)m(XO4)pZq, where m:p>2:1
Brochantite30.1.3.1Cu4(SO4)(OH)6
(AB)2(XO4)Zq
Jarosite30.2.5.1KFe3+ 3(SO4)2(OH)6
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
AB2(XO4)2·xH2O, containing (UO2)2+
Carnotite40.2a.28.1K2(UO2)2(VO4)2 · 3H2O
Metatorbernite40.2a.13.2Cu(UO2)2(PO4)2 · 8H2O
Metazeunerite40.2a.14.2Cu(UO2)2(AsO4)2 · 8H2O
Torbernite40.2a.13.1Cu(UO2)2(PO4)2 · 12H2O
Tyuyamunite40.2a.26.1Ca(UO2)2(VO4)2 · 5-8H2O
Uranospinite40.2a.2.1Ca(UO2)(AsO4)2 · 10H2O
Zeunerite40.2a.14.1Cu(UO2)2(AsO4)2 · 12H2O
A3(XO4)2·xH2O
Erythrite40.3.6.3Co3(AsO4)2 · 8H2O
Group 48 - ANHYDROUS MOLYBDATES AND TUNGSTATES
AXO4
Wulfenite48.1.3.1Pb(MoO4)
Group 53 - NESOSILICATES Insular SiO4 Groups and Other Anions or Complex Cations
Insular SiO4 Groups and Other Anions of Complex Cations with (UO2)
Uranophane53.3.1.2Ca(UO2)2(SiO3OH)2 · 5H2O
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
var: Illite71.2.2d.2K0.65Al2.0[Al0.65Si3.35O10](OH)2
Group 74 - PHYLLOSILICATES Modulated Layers
Modulated Layers with joined strips
Chrysocolla74.3.2.1Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 77 - TECTOSILICATES Zeolites
Zeolite group - True zeolites
Laumontite77.1.1.4CaAl2Si4O12 · 4H2O
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
Aragonite-CaCO3
'Bravoite'-(Fe,Ni)S2
Kaolinite-Al2(Si2O5)(OH)4
'Limonite'-(Fe,O,OH,H2O)
Quartz
var: Chalcedony
-SiO2

List of minerals for each chemical element

HHydrogen
H MalachiteCu2(CO3)(OH)2
H AzuriteCu3(CO3)2(OH)2
H RameauiteK2Ca(H2[3]O)(H2[5]O)4[(UO2)6O6(OH)4](H2[4]O)
H TorberniteCu(UO2)2(PO4)2 · 12H2O
H UranospiniteCa(UO2)(AsO4)2 · 10H2O
H ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
H GypsumCaSO4 · 2H2O
H ChalcanthiteCuSO4 · 5H2O
H CarnotiteK2(UO2)2(VO4)2 · 3H2O
H MetatorberniteCu(UO2)2(PO4)2 · 8H2O
H ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
H MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
H UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
H TyuyamuniteCa(UO2)2(VO4)2 · 5-8H2O
H BrochantiteCu4(SO4)(OH)6
H IlsemanniteMo3O8 · nH2O
H ErythriteCo3(AsO4)2 · 8H2O
H BieberiteCoSO4 · 7H2O
H Goethiteα-Fe3+O(OH)
H Limonite(Fe,O,OH,H2O)
H JarositeKFe3+ 3(SO4)2(OH)6
H KaoliniteAl2(Si2O5)(OH)4
H Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
H HexahydriteMgSO4 · 6H2O
H LaumontiteCaAl2Si4O12 · 4H2O
H HalotrichiteFeAl2(SO4)4 · 22H2O
H Alum-(K)KAl(SO4)2 · 12H2O
H MuscoviteKAl2(AlSi3O10)(OH)2
H Wupatkiite(Co,Mg,Ni)Al2(SO4)4·22H2O
CCarbon
C MalachiteCu2(CO3)(OH)2
C AzuriteCu3(CO3)2(OH)2
C SmithsoniteZnCO3
C CerussitePbCO3
C RhodochrositeMnCO3
C SideriteFeCO3
C AnkeriteCa(Fe2+,Mg)(CO3)2
C CalciteCaCO3
C DolomiteCaMg(CO3)2
C AragoniteCaCO3
OOxygen
O BaryteBaSO4
O MalachiteCu2(CO3)(OH)2
O AzuriteCu3(CO3)2(OH)2
O RameauiteK2Ca(H2[3]O)(H2[5]O)4[(UO2)6O6(OH)4](H2[4]O)
O UraniniteUO2
O TorberniteCu(UO2)2(PO4)2 · 12H2O
O UranospiniteCa(UO2)(AsO4)2 · 10H2O
O ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
O HematiteFe2O3
O GypsumCaSO4 · 2H2O
O ChalcanthiteCuSO4 · 5H2O
O CarnotiteK2(UO2)2(VO4)2 · 3H2O
O MetatorberniteCu(UO2)2(PO4)2 · 8H2O
O ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
O MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
O UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
O TyuyamuniteCa(UO2)2(VO4)2 · 5-8H2O
O BrochantiteCu4(SO4)(OH)6
O SmithsoniteZnCO3
O AnglesitePbSO4
O CerussitePbCO3
O WulfenitePb(MoO4)
O IlsemanniteMo3O8 · nH2O
O ErythriteCo3(AsO4)2 · 8H2O
O BieberiteCoSO4 · 7H2O
O PyrolusiteMn4+O2
O RhodochrositeMnCO3
O SideriteFeCO3
O Goethiteα-Fe3+O(OH)
O Limonite(Fe,O,OH,H2O)
O JarositeKFe3+ 3(SO4)2(OH)6
O AnkeriteCa(Fe2+,Mg)(CO3)2
O QuartzSiO2
O Quartz (var: Chalcedony)SiO2
O KaoliniteAl2(Si2O5)(OH)4
O Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
O CalciteCaCO3
O DolomiteCaMg(CO3)2
O AnhydriteCaSO4
O HexahydriteMgSO4 · 6H2O
O LaumontiteCaAl2Si4O12 · 4H2O
O AragoniteCaCO3
O HalotrichiteFeAl2(SO4)4 · 22H2O
O Alum-(K)KAl(SO4)2 · 12H2O
O MuscoviteKAl2(AlSi3O10)(OH)2
O Wupatkiite(Co,Mg,Ni)Al2(SO4)4·22H2O
MgMagnesium
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
Mg DolomiteCaMg(CO3)2
Mg HexahydriteMgSO4 · 6H2O
AlAluminium
Al ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Al KaoliniteAl2(Si2O5)(OH)4
Al Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Al LaumontiteCaAl2Si4O12 · 4H2O
Al HalotrichiteFeAl2(SO4)4 · 22H2O
Al Alum-(K)KAl(SO4)2 · 12H2O
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Wupatkiite(Co,Mg,Ni)Al2(SO4)4·22H2O
SiSilicon
Si ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Si UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Si QuartzSiO2
Si Quartz (var: Chalcedony)SiO2
Si KaoliniteAl2(Si2O5)(OH)4
Si Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
Si LaumontiteCaAl2Si4O12 · 4H2O
Si MuscoviteKAl2(AlSi3O10)(OH)2
PPhosphorus
P TorberniteCu(UO2)2(PO4)2 · 12H2O
P MetatorberniteCu(UO2)2(PO4)2 · 8H2O
SSulfur
S VaesiteNiS2
S BaryteBaSO4
S ChalcociteCu2S
S MilleriteNiS
S PyriteFeS2
S SiegeniteCoNi2S4
S GypsumCaSO4 · 2H2O
S ArsenopyriteFeAsS
S ChalcopyriteCuFeS2
S ChalcanthiteCuSO4 · 5H2O
S Bravoite(Fe,Ni)S2
S BorniteCu5FeS4
S DigeniteCu9S5
S CovelliteCuS
S EnargiteCu3AsS4
S TennantiteCu6[Cu4(Fe,Zn)2]As4S13
S BrochantiteCu4(SO4)(OH)6
S SphaleriteZnS
S GalenaPbS
S AnglesitePbSO4
S MolybdeniteMoS2
S GersdorffiteNiAsS
S BieberiteCoSO4 · 7H2O
S MarcasiteFeS2
S JarositeKFe3+ 3(SO4)2(OH)6
S AnhydriteCaSO4
S HexahydriteMgSO4 · 6H2O
S HalotrichiteFeAl2(SO4)4 · 22H2O
S Alum-(K)KAl(SO4)2 · 12H2O
S Wupatkiite(Co,Mg,Ni)Al2(SO4)4·22H2O
KPotassium
K RameauiteK2Ca(H2[3]O)(H2[5]O)4[(UO2)6O6(OH)4](H2[4]O)
K CarnotiteK2(UO2)2(VO4)2 · 3H2O
K JarositeKFe3+ 3(SO4)2(OH)6
K Muscovite (var: Illite)K0.65Al2.0[Al0.65Si3.35O10](OH)2
K Alum-(K)KAl(SO4)2 · 12H2O
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca RameauiteK2Ca(H2[3]O)(H2[5]O)4[(UO2)6O6(OH)4](H2[4]O)
Ca UranospiniteCa(UO2)(AsO4)2 · 10H2O
Ca GypsumCaSO4 · 2H2O
Ca UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
Ca TyuyamuniteCa(UO2)2(VO4)2 · 5-8H2O
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
Ca AnhydriteCaSO4
Ca LaumontiteCaAl2Si4O12 · 4H2O
Ca AragoniteCaCO3
VVanadium
V CarnotiteK2(UO2)2(VO4)2 · 3H2O
V TyuyamuniteCa(UO2)2(VO4)2 · 5-8H2O
MnManganese
Mn PyrolusiteMn4+O2
Mn RhodochrositeMnCO3
FeIron
Fe PyriteFeS2
Fe HematiteFe2O3
Fe ArsenopyriteFeAsS
Fe ChalcopyriteCuFeS2
Fe Bravoite(Fe,Ni)S2
Fe BorniteCu5FeS4
Fe MarcasiteFeS2
Fe SideriteFeCO3
Fe Goethiteα-Fe3+O(OH)
Fe Limonite(Fe,O,OH,H2O)
Fe JarositeKFe3+ 3(SO4)2(OH)6
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe HalotrichiteFeAl2(SO4)4 · 22H2O
CoCobalt
Co SiegeniteCoNi2S4
Co ErythriteCo3(AsO4)2 · 8H2O
Co BieberiteCoSO4 · 7H2O
Co SkutteruditeCoAs3
Co Wupatkiite(Co,Mg,Ni)Al2(SO4)4·22H2O
NiNickel
Ni VaesiteNiS2
Ni MilleriteNiS
Ni RammelsbergiteNiAs2
Ni SiegeniteCoNi2S4
Ni Bravoite(Fe,Ni)S2
Ni NickelineNiAs
Ni PararammelsbergiteNiAs2
Ni GersdorffiteNiAsS
CuCopper
Cu ChalcociteCu2S
Cu MalachiteCu2(CO3)(OH)2
Cu AzuriteCu3(CO3)2(OH)2
Cu TorberniteCu(UO2)2(PO4)2 · 12H2O
Cu ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
Cu ChalcopyriteCuFeS2
Cu ChalcanthiteCuSO4 · 5H2O
Cu BorniteCu5FeS4
Cu DigeniteCu9S5
Cu CovelliteCuS
Cu MetatorberniteCu(UO2)2(PO4)2 · 8H2O
Cu ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
Cu MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
Cu EnargiteCu3AsS4
Cu TennantiteCu6[Cu4(Fe,Zn)2]As4S13
Cu BrochantiteCu4(SO4)(OH)6
Cu CopperCu
ZnZinc
Zn SphaleriteZnS
Zn SmithsoniteZnCO3
AsArsenic
As RammelsbergiteNiAs2
As UranospiniteCa(UO2)(AsO4)2 · 10H2O
As ArsenopyriteFeAsS
As ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
As MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
As EnargiteCu3AsS4
As TennantiteCu6[Cu4(Fe,Zn)2]As4S13
As NickelineNiAs
As PararammelsbergiteNiAs2
As GersdorffiteNiAsS
As ErythriteCo3(AsO4)2 · 8H2O
As SkutteruditeCoAs3
MoMolybdenum
Mo WulfenitePb(MoO4)
Mo MolybdeniteMoS2
Mo IlsemanniteMo3O8 · nH2O
BaBarium
Ba BaryteBaSO4
PbLead
Pb GalenaPbS
Pb AnglesitePbSO4
Pb CerussitePbCO3
Pb WulfenitePb(MoO4)
UUranium
U RameauiteK2Ca(H2[3]O)(H2[5]O)4[(UO2)6O6(OH)4](H2[4]O)
U UraniniteUO2
U TorberniteCu(UO2)2(PO4)2 · 12H2O
U UranospiniteCa(UO2)(AsO4)2 · 10H2O
U CarnotiteK2(UO2)2(VO4)2 · 3H2O
U MetatorberniteCu(UO2)2(PO4)2 · 8H2O
U ZeuneriteCu(UO2)2(AsO4)2 · 12H2O
U MetazeuneriteCu(UO2)2(AsO4)2 · 8H2O
U UranophaneCa(UO2)2(SiO3OH)2 · 5H2O
U TyuyamuniteCa(UO2)2(VO4)2 · 5-8H2O

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Permian
251.902 - 298.9 Ma



ID: 3187666
Paleozoic sedimentary rocks

Age: Phanerozoic (251.902 - 298.9 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Roadian - Kungurian
268.8 - 283.5 Ma



ID: 2728387
Permian sedimentary rocks

Age: Permian (268.8 - 283.5 Ma)

Stratigraphic Name: Kaibab Formation; Toroweap Formation; Coconino Sandstone

Description: Gray to tan, cherty limestone of Kaibab and Toroweap Formations, and underlying white to tan, fine-grained Coconino Sandstone. Limestone was deposited in a shallow sea, and sandstone was deposited in near-shore dunes and beach settings. (270-280 Ma)

Comments: Original map source: Arizona Geological Survey, DI-8 Geologic Map of Arizona, Digital Spatial data for the Geologic Map of Arizona, v. 3.0, edited by S.M. Richard and S.M. Kneale, 2002, 10 p., 2 DOS HD disks. Arc/INFO export file (.e00) format, scale 1:1,000,000.

Lithology: Major:{sandstone,limestone}, Minor:{chert}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Early Permian
272.95 - 298.9 Ma



ID: 2202009
Kaibab Formation

Age: Cisuralian (272.95 - 298.9 Ma)

Stratigraphic Name: Kaibab Formation

Description: Includes, in descending order, Harrisburg and Fossil Mountain Members, undivided, as defined by Sorauf and Billingsley (1991). Harrisburg Member—Reddish-gray and brownish-gray, slope-forming gypsum, siltstone, sandstone, and limestone. Informally subdivided, in descending order, into three units forming an upper slope, middle cliff, and lower slope. Upper slope unit is interbedded red and gray gypsum, sandstone, and siltstone, and yellowish-gray fossiliferous sandy limestone. Middle cliff unit is gray, thin-bedded, fossiliferous cherty limestone and sandy limestone. Lower slope unit is (1) yellowish-gray to pale-red gypsifereous siltstone and calcareous sandstone, (2) gray, thin-bedded sandy limestone, and (3) gray to white, thick-bedded gypsum. Upper, middle, and lower units become inseparable on the Kaibab Plateau, northeastern quarter of map area. Solution weathering within gypsum beds of lower slope unit has resulted in warping and bending of limestone of middle cliff unit, especially in or near local drainages on Kanab and Coconino Plateaus where middle cliff unit forms surface bedrock. Gypsum solutioning is responsible for several sinkhole depressions within Harrisburg Member. Contact with underlying Fossil Mountain Member is gradational and arbitrarily marked at top of cherty limestone cliff of the Fossil Mountain. About 260 ft (80 m) thick in western half of map area, thinning eastward to about 120 ft (36 m) in northeastern quarter of map area. Average thickness about 165 ft (50 m) Fossil Mountain Member—Light-gray, cliff-forming, fine- to medium-grained, thin- to medium-bedded [1–6 ft (0.3–2 m)], fossiliferous, sandy, cherty limestone. In general, unit weathers dark gray. Unit characterized by gray to white fossiliferous chert nodules and white chert lenses parallel to bedding; chert weathers dark gray to black. Some chert nodules contain concentric black and white bands. Includes brecciated chert beds 4–10 ft (1–3 m) thick in upper part at contact of thin limestone or gypsifereous siltstone of Harrisburg Member. Chert in central and western parts of map area makes up about 20 percent of unit; unit becomes sandy in northeastern quarter of map area. Generally forms cliff at rim of the Grand Canyon. Weathers into pinnacles or “pillars” detached from cliff in western half of map area. Unconformable contact with underlying Woods Ranch Member of Toroweap Formation (Pt) attributed to solution erosion and channel erosion; average relief about 10 ft (3 m). Some channels have eroded as much as 150 ft (45 m) into the Woods Ranch in western half of map area. Erosion channels were filled with sandy cherty limestone typical of the Fossil Mountain, providing an extra thickness of the Fossil Mountain. Thickness about 230–350 ft (70–107 m)

Reference: Billingsley, G.H. Geologic Map of the Grand Canyon 30' x 60' Quadrangle, Coconino and Mohave Counties, Northwestern Arizona. USGS Geologic Investigations Series I-2688. [34]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


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