Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org



The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.


Locality Name:
McKinley Co., New Mexico, USA

Oldest recorded age at locality: 850
Youngest recorded age at locality: 3

mindat Locality ID: 13536
mindat URL: http://www.mindat.org/loc-13536.html

Tectonic Settings:

Total number of sublocalities beneath "McKinley Co., New Mexico, USA": 149
Total number of bottom-level sublocalities: 134

Number of Child Localities: 14
Child Localities:
Buell Park Area
Dos Lomas
Fort Defiance Area
Fort Wingate
Fort Wingate Area
Gallup District
Grants District
Laguna District
Outlet Neck
Red Lake Volcanic Field
Todilto Park
Valle De San Miguel
Zilditloi Mountain
Zuni Pueblo

Latitude: 35°37'52"N
Longitude: 108°42'20"W
Decimal Degree (lat, lon): 35.631111111111,-108.70555555556
AThis mineral is Anthropogenic.
GThis mineral is directly dated.
BThis mineral is reported as having this age.
YThis mineral is using an age reported as an element mineralization period.
OThis mineral is using an age calculated from all data at the locality.
RThe age displayed for this mineral originates from a different, non-child locality.
PThe age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
This mineral's age has not yet been recorded.

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Al As Ba C Ca Cu F Fe H K Mg Mn Mo Na O P Pb S Sb Se Si Sr Ti U V Zr 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AluniteAmorphousAmphiboleAnalcimeAutuniteBaryteBrookiteCalciteChalcopyriteChlorite
ClayClinozoisiteCoronaditeCorundumDiasporeEpidoteEpsomiteFeldsparFluoriteFritzscheite
GarnetGypsumHalotrichiteHewettiteHumiteJohanniteKaoliniteLepidocrociteMalachiteMarcasite
MelanteriteMeta-autuniteMicaMolybdeniteNoneNot in a structural groupOlivinePascoitePrehnitePyrite
PyrophyllitePyroxeneQuartzRamsdelliteRocksaltRutileSepioliteSerpentineSmectite-vermiculiteSpinel
StibniteStraczekiteSulphurTalcTopazTridymiteWollastoniteZippeiteZircon

106 IMA Minerals at location:
Actinolite  (*)Aegirine  (*)Albite  (*)Alunogen  (*)Analcime  (*)
Anatase  (*)Andersonite  (*)Antigorite  (*)Augite  (*)Autunite  (*)
Barnesite  (*)Baryte  (*)Bayleyite  (*)Beidellite  (*)Brookite  (*)
Calcite  (*)Carnotite  (*)Chalcopyrite  (*)Chamosite  (*)Clinohumite  (*)
Coffinite  (*)Corvusite  (*)Cryptomelane  (*)Cuprosklodowskite  (*)Curite  (*)
Diopside  (*)Dolomite  (*)Doloresite  (*)Enstatite  (*)Epidote  (*)
Epsomite  (*)Ferroselite  (*)Fluorite  (*)Forsterite  (*)Galena  (*)
Goethite  (*)Grantsite  (*)Gypsum  (*)Häggite  (*)Halotrichite  (*)
Hematite  (*)Hewettite  (*)Nováčekite-I  (*)Ilmenite  (*)Ilsemannite  (*)
Jarosite  (*)Johannite  (*)Jordisite  (*)Kaolinite  (*)Lepidocrocite  (*)
Leucite  (*)Liebigite  (*)Magnetite  (*)Malachite  (*)Marcasite  (*)
Melanterite  (*)Meta-autunite  (*)Metahewettite  (*)Metatyuyamunite  (*)Microcline  (*)
Molybdenite  (*)Montmorillonite  (*)Montroseite  (*)Muscovite  (*)Natrozippeite  (*)
Nepheline  (*)Nontronite  (*)Opal  (*)Paramontroseite  (*)Uranophane-β  (*)
Pascoite  (*)Prehnite  (*)Pyrite  (*)Pyrolusite  (*)Pyrope  (*)
Pyrophyllite  (*)Quartz  (*)Rabejacite  (*)Rauvite  (*)Roscoelite  (*)
Rutherfordine  (*)Rutile  (*)Sanidine  (*)Santafeite  (*)Schröckingerite  (*)
Selenium  (*)Sepiolite  (*)Sklodowskite  (*)Spinel  (*)Stibnite  (*)
Sulphur  (*)Talc  (*)Thénardite  (*)Thermonatrite  (*)Todorokite  (*)
Topaz  (*)Trona  (*)Tyuyamunite  (*)Uraninite  (*)Uranophane-α  (*)
Uranopilite  (*)Weeksite  (*)Wollastonite  (*)Zellerite  (*)Zippeite  (*)
Zircon  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Actinolite  (*)Amphibole   Ca2(Mg4.5-2.5Fe2+0.5-2.5)Si8O22(OH)212460393419
Aegirine  (*)PyroxeneNaFe3+Si2O612461791022
Albite  (*)FeldsparNa(AlSi3O8)12460468803
Alunogen  (*)Not in a structural groupAl2(SO4)3(H2O)12·5H2O2246046,246047272
Analcime  (*)AnalcimeNa(AlSi2O6)·H2O12461821627
Anatase  (*)Not in a structural groupTiO226035246046,246048,246089,246155,2461672162
Andersonite  (*)Not in a structural groupNa2Ca(UO2)(CO3)3·5-6H2O26036246051,246052,246103,246108,246113,24611447
Antigorite  (*)Serpentine ClayMg3Si2O5(OH)41246039708
Augite  (*)Pyroxene(Ca,Mg,Fe)2Si2O612461792060
Autunite  (*)AutuniteCa(UO2)2(PO4)2·10-12H2O26034246051,246057,246092,2460941272
Barnesite  (*)HewettiteNa2V5+6O16·3H2O2603124605115
Baryte  (*)BaryteBa(SO4)260320246051,246068,246069,246070,246078,246080,246086,246091,246094,246095,246100,246101,246103,246104,246108,246113,246114,246117,246155,24616711547
Bayleyite  (*)NoneMg2(UO2)(CO3)3·18H2O26035246051,246052,246094,246108,24610938
Beidellite  (*)Clay Smectite-vermiculite(Na,Ca)0.3Al2(Si,Al)4O10(OH)2·nH2O124604685
Brookite  (*)BrookiteTiO21246046700
Calcite  (*)CalciteCa(CO3)260323246051,246053,246061,246069,246070,246078,246091,246094,246095,246100,246103,246108,246117,246123,246126,246130,246137,246159,246167,246168,246179,246181,24618627770
Carnotite  (*)NoneK2(UO2)2(VO4)2·3H2O260314246046,246051,246057,246062,246092,246094,246108,246129,246130,246136,246137,246143,246152,2461571184
Chalcopyrite  (*)ChalcopyriteCuFeS226032246051,24607627198
Chamosite  (*)Chlorite Clay(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)826031246089577
Clinohumite  (*)HumiteMg9(SiO4)4F21246181236
Coffinite  (*)ZirconU(SiO4)·nH2O260323246051,246053,246068,246076,246078,246080,246086,246088,246089,246092,246094,246100,246103,246104,246108,246109,246111,246113,246114,246148,246152,246155,246157566
Corvusite  (*)Straczekite(Na,Ca,K)1-x(V5+,V4+,Fe2+)8O20·4H2O26032246108,24613779
Cryptomelane  (*)CoronaditeK(Mn4+7Mn3+)O1626036246051,246061,246109,246111,246157,246159599
Cuprosklodowskite  (*)NoneCu(UO2)2(SiO3OH)2·6H2O26032246051,24612658
Curite  (*)NonePb3+x[(UO2)4O4+x(OH)3-x]2·2H2O26073124605251
Diopside  (*)PyroxeneCaMgSi2O62246181,2461864135
Dolomite  (*)NoneCaMg(CO3)2155312461679895
Doloresite  (*)NoneV4+3O4(OH)426033246051,246052,24610823
Enstatite  (*)PyroxeneMg2Si2O62246039,246181944
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)12461818173
Epsomite  (*)EpsomiteMg(SO4)·7H2O26031246079484
Ferroselite  (*)MarcasiteFeSe226039246051,246052,246068,246086,246101,246103,246108,246114,24615551
Fluorite  (*)FluoriteCaF226035246051,246069,246074,246091,2461119617
Forsterite  (*)OlivineMg2(SiO4)12461811188
Galena  (*)RocksaltPbS26033246051,246094,24615524243
Goethite  (*)DiasporeFeO(OH)26036246051,246062,246108,246114,246167,2461687437
Grantsite  (*)Hewettite(Na,Ca)2+x(V5+,V4+)6O16·4H2O113732246051,2461177
Gypsum  (*)GypsumCa(SO4)·2H2O260311246046,246049,246050,246051,246052,246094,246108,246114,246123,246130,2461676890
Häggite  (*)NoneV3+V4+O2(OH)326035246051,246068,246101,246103,24611717
Halotrichite  (*)HalotrichiteFe2+Al2(SO4)4·22H2O15531246130409
Hematite  (*)CorundumFe2O3260311246039,246051,246070,246089,246095,246108,246109,246114,246140,246167,24616814640
Hewettite  (*)HewettiteCaV5+6O16·9H2O260732246051,24605258
Nováčekite-I  (*)NoneMg(UO2)2(AsO4)2·12H2O260732246051,24605255
Ilmenite  (*)CorundumFe2+Ti4+O315533246046,246167,2461815433
Ilsemannite  (*)NoneMo3O8·nH2O (?)260312246051,246060,246061,246065,246078,246086,246088,246100,246109,246113,246116,246127123
Jarosite  (*)AluniteKFe3+3(SO4)2(OH)626036246049,246050,246051,246123,246130,2461372228
Johannite  (*)JohanniteCu(UO2)2(SO4)2(OH)2·8H2O26073124605269
Jordisite  (*)AmorphousMoS2260323246051,246053,246060,246065,246068,246078,246081,246086,246088,246092,246099,246100,246104,246109,246113,246114,246116,246117,246118,246127,246159,246167,246168102
Kaolinite  (*)Clay KaoliniteAl2Si2O5(OH)426035246051,246089,246094,246100,2461675591
Lepidocrocite  (*)LepidocrociteFe3+O(OH)26031246051581
Leucite  (*)AnalcimeK(AlSi2O6)1246183233
Liebigite  (*)NoneCa2(UO2)(CO3)3·11H2O26032246051,24610878
Magnetite  (*)SpinelFe2+Fe3+2O43246039,246046,24618114899
Malachite  (*)MalachiteCu2(CO3)(OH)22603124607612537
Marcasite  (*)MarcasiteFeS226036246078,246101,246114,246137,246167,2461685674
Melanterite  (*)MelanteriteFe(SO4)·7H2O260731246052915
Meta-autunite  (*)Meta-autuniteCa(UO2)2(PO4)2·6H2O26033246092,246094,246130388
Metahewettite  (*)HewettiteCaV5+6O16·3H2O260732246051,24605256
Metatyuyamunite  (*)FritzscheiteCa(UO2)2(VO4)2·3H2O260313246046,246051,246068,246076,246094,246103,246108,246109,246123,246130,246137,246159,246176129
Microcline  (*)FeldsparK(AlSi3O8)26032246051,2460914924
Molybdenite  (*)MolybdeniteMoS2260312460515800
Montmorillonite  (*)Clay Smectite-vermiculite(Na,Ca)0.3(Al,Mg)2Si4O10(OH)2·nH2O26034246051,246089,246167,2461821508
Montroseite  (*)Diaspore(V3+,Fe2+,V4+)O(OH)26034246051,246100,246101,246108136
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)226032246051,24608917380
Natrozippeite  (*)ZippeiteNa5(UO2)8(SO4)4O5(OH)3·12H2O26032246051,24607941
Nepheline  (*)TridymiteNa3K(Al4Si4O16)2246182,246186884
Nontronite  (*)Clay Smectite-vermiculiteNa0.3Fe3+2(Si,Al)4O10(OH)2·nH2O26031246051471
Opal  (*)AmorphousSiO2·nH2O12460462994
Paramontroseite  (*)RamsdelliteVO2260310246051,246068,246080,246094,246100,246101,246103,246108,246109,24611739
Uranophane-β  (*)NoneCa(UO2)2(SiO3OH)2·5H2O26031246051144
Pascoite  (*)PascoiteCa3V5+10O28·17H2O260310246051,246052,246068,246087,246094,246100,246101,246103,246108,24613478
Prehnite  (*)PrehniteCa2Al(Si3Al)O10(OH)212461781898
Pyrite  (*)PyriteFeS2260321246051,246052,246053,246061,246066,246068,246069,246070,246078,246086,246089,246091,246094,246095,246100,246108,246109,246114,246155,246167,24616839462
Pyrolusite  (*)RutileMnO226032246051,2460913106
Pyrope  (*)GarnetMg3Al2(SiO4)34246039,246045,246181,246187341
Pyrophyllite  (*)Clay PyrophylliteAl2Si4O10(OH)21246182771
Quartz  (*)QuartzSiO226035246043,246046,246051,246079,24616761156
Rabejacite  (*)NoneCa2[(UO2)4O4(SO4)2](H2O)826073124605211
Rauvite  (*)NoneCa(UO2)2V10O28·16H2O26032246051,24617632
Roscoelite  (*)MicaKV3+2(Si3Al)O10(OH)226031246051253
Rutherfordine  (*)None(UO2)(CO3)26032246051,24607658
Rutile  (*)RutileTiO226033246046,246089,2461675614
Sanidine  (*)FeldsparK(AlSi3O8)3246179,246183,246186598
Santafeite  (*)None(Ca,Sr,Na)3(Mn2+,Fe3+)2Mn4+2(VO4)4(OH,O)5·2H2O260312461265
Schröckingerite  (*)NoneNaCa3(UO2)(SO4)(CO3)3F·10H2O26037246051,246057,246073,246092,246094,246108,246152128
Selenium  (*)SulphurSe260318246051,246053,246061,246067,246068,246079,246080,246086,246094,246100,246103,246108,246109,246114,246134,246159,246167,246168143
Sepiolite  (*)Sepiolite ClayMg4Si6O15(OH)2·6H2O1246181241
Sklodowskite  (*)NoneMg(UO2)2(SiO3OH)2·6H2O2603124605156
Spinel  (*)SpinelMgAl2O412460431934
Stibnite  (*)StibniteSb2S326032246051,2460763418
Sulphur  (*)SulphurS12460462045
Talc  (*)Clay TalcMg3Si4O10(OH)22246039,2461813337
Thénardite  (*)NoneNa2(SO4)26033246051,246103,246108299
Thermonatrite  (*)NoneNa2(CO3)·H2O26032246051,24610864
Todorokite  (*)None(Na,Ca,K,Ba,Sr)1-x(Mn,Mg,Al)6O12·3-4H2O26032246051,246067433
Topaz  (*)TopazAl2SiO4F212460431476
Trona  (*)NoneNa3(HCO3)(CO3)·2H2O1246185129
Tyuyamunite  (*)NoneCa(UO2)2(VO4)2·5-8H2O260317246051,246057,246062,246068,246076,246092,246094,246103,246108,246109,246117,246123,246125,246132,246137,246157,246159628
Uraninite  (*)FluoriteUO2260316246051,246052,246069,246070,246074,246076,246079,246086,246088,246091,246094,246095,246108,246111,246137,2461482718
Uranophane-α  (*)NoneCa(UO2)2(SiO3OH)2·5H2O26034246051,246091,246100,246130890
Uranopilite  (*)None(UO2)6(SO4)O2(OH)6·14H2O26033246051,246067,24615994
Weeksite  (*)None(K)2(UO2)2(Si5O13)·4H2O2603124605142
Wollastonite  (*)WollastoniteCaSiO312461781247
Zellerite  (*)NoneCa(UO2)(CO3)2·5H2O26033246051,246052,24615715
Zippeite  (*)ZippeiteK2[(UO2)4(SO4)2O2(OH)2](H2O)4260311246051,246052,246060,246067,246079,246086,246088,246100,246114,246134,246152175
Zircon  (*)ZirconZr(SiO4)2246043,2460465251


Locality Notes from all Ages at Locality:
Age IDLocality Notes
Giersdorf_00000589Urano-organic ore disseminated throughout the Morrison sandstones of Jurassic Age. Additionally, ore is found in the Todilto Limestone and Westwater Canyon Sandstone. Todilto Limestone is lacustrine in nature, suggesting a hydrothermal origin.
Giersdorf_00000590Urano-organic ore disseminated throughout the Morrison sandstones of Jurassic Age. Additionally, ore is found in the Todilto Limestone and Westwater Canyon Sandstone. Todilto Limestone is lacustrine in nature, suggesting a hydrothermal origin.
Giersdorf_00000591Urano-organic ore disseminated throughout the Morrison sandstones of Jurassic Age. Additionally, ore is found in the Todilto Limestone and Westwater Canyon Sandstone. Todilto Limestone is lacustrine in nature, suggesting a hydrothermal origin.
Giersdorf_00000592Urano-organic ore disseminated throughout the Morrison sandstones of Jurassic Age. Additionally, ore is found in the Todilto Limestone and Westwater Canyon Sandstone. Todilto Limestone is lacustrine in nature, suggesting a hydrothermal origin.
Giersdorf_00000593Urano-organic ore disseminated throughout the Morrison sandstones of Jurassic Age. Additionally, ore is found in the Todilto Limestone and Westwater Canyon Sandstone. Todilto Limestone is lacustrine in nature, suggesting a hydrothermal origin.
Giersdorf_00000594Urano-organic ore disseminated throughout the Morrison sandstones of Jurassic Age. Additionally, ore is found in the Todilto Limestone and Westwater Canyon Sandstone. Todilto Limestone is lacustrine in nature, suggesting a hydrothermal origin.
Giersdorf_00000595Urano-organic ore disseminated throughout the Morrison sandstones of Jurassic Age. Additionally, ore is found in the Todilto Limestone and Westwater Canyon Sandstone. Todilto Limestone is lacustrine in nature, suggesting a hydrothermal origin.
Giersdorf_00000701The Jackpile-Paguate mine is a uranium prospect which pulls its material from the Morrisson formation, particularly the Jackpile member of the formation from which it derives its name. The uranium resources are primarily found in lenticular pockets in the host sandstone of the Jackpile Member.
Giersdorf_00000702The Grants Uranium Mining District is a large area of economically attractive uranium deposits which are derived from the Morrison formation and the Todilto Limestone formation.
Giersdorf_00000703The Grants Uranium Mining District is a large area of economically attractive uranium deposits which are derived from the Morrison formation and the Todilto Limestone formation.
Giersdorf_00000704The Grants Uranium Mining District is a large area of economically attractive uranium deposits which are derived from the Morrison formation and the Todilto Limestone formation.
Giersdorf_00000705The Grants Uranium Mining District is a large area of economically attractive uranium deposits which are derived from the Morrison formation and the Todilto Limestone formation.
Giersdorf_00000706The Grants Uranium Mining District is a large area of economically attractive uranium deposits which are derived from the Morrison formation and the Todilto Limestone formation.
Giersdorf_00000707The Grants Uranium Mining District is a large area of economically attractive uranium deposits which are derived from the Morrison formation and the Todilto Limestone formation.
Giersdorf_00000708The Grants Uranium Mining District is a large area of economically attractive uranium deposits which are derived from the Morrison formation and the Todilto Limestone formation.


15 Ages assigned to this locality:

Excel IDMax Age (Ma)Min Age (Ma)Age as listed in referenceDating MethodAge InterpretPrioritized?Sample SourceSample NumRun NumAge from other LocalityDated MineralMinerals explicitely stated as having this ageAge applies to these ElementsMinDat Locality IDDated Locality (Max Age)Location as listed in referenceReferenceReference DOIReference IDAge Notes
Giersdorf_00000701115110115-110U-Pb    Yes U33622Jackpile Mine (Jackpile-Paguate), Laguna District, Cibola Co., New Mexico, USAJackpile-Paguate MineMcLemore (2011)10.1.1.688.1172TMG48_23Age of uranium mineralization in the Jackpile Member of the Morrisson Formation
Giersdorf_00000702155150155-150U-Pb      U22034Grants District, McKinley Co., New Mexico, USAGrants Uranium Mining DistrictMcLemore (2011)10.1.1.688.1172TMG48_23Age of the uranium mineralization in the Todilto limestone associated with the Morrison formation.
Giersdorf_00000703148130148-130U-Pb      U22034Grants District, McKinley Co., New Mexico, USAGrants Uranium Mining DistrictMcLemore (2011)10.1.1.688.1172TMG48_23Age of uranium mineralization in the Westwater Canyon Member of the Morrisson Formation
Giersdorf_00000704130115130-115U-Pb      U22034Grants District, McKinley Co., New Mexico, USAGrants Uranium Mining DistrictMcLemore (2011)10.1.1.688.1172TMG48_23Estimated age of the Uranium mineralization in the Brushy Basin Member of the Morrison Formation
Giersdorf_00000705130115130-115U-Pb      U22034Grants District, McKinley Co., New Mexico, USAGrants Uranium Mining DistrictMcLemore (2011)10.1.1.688.1172TMG48_23Estimated age of the Uranium mineralization in the Poison Canyon Member of the Morrison Formation
Giersdorf_0000070610680106-80U-Pb      U22034Grants District, McKinley Co., New Mexico, USAGrants Uranium Mining DistrictMcLemore (2011)10.1.1.688.1172TMG48_23Age of a redistribution event affecting the Dakota, Brushy Basin, and Westwater Canyon Members of the Morrison Formation
Giersdorf_0000070712312-3U-Pb      U22034Grants District, McKinley Co., New Mexico, USAGrants Uranium Mining DistrictMcLemore (2011)10.1.1.688.1172TMG48_23Age of a redistribution event affecting the Dakota, Brushy Basin, and Westwater Canyon Members of the Morrison Formation
Giersdorf_00000708737-3U-Pb      U22034Grants District, McKinley Co., New Mexico, USAGrants Uranium Mining DistrictMcLemore (2011)10.1.1.688.1172TMG48_23Age of a secondary depositional event in the Todilto Limestone
Giersdorf_00000589260250255±5238U-206U uraniniteK-179b  UraniniteUraniniteU262609Haystack Butte (Haystack Mountain), Ambrosia Lake Sub-district, Grants District, McKinley Co., New Mexico, USAAmbrosia LakeMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for U238-Pb206 analysis
Giersdorf_00000590180170175±5235U-207Pb uraniniteK-179b  UraniniteUraniniteU262609Haystack Butte (Haystack Mountain), Ambrosia Lake Sub-district, Grants District, McKinley Co., New Mexico, USAAmbrosia LakeMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for U235-Pb207 analysis
Giersdorf_00000591180140160±20207Pb-206PbThe Pb207-Pb206 age given for these samples is described as being highly erroneous due to the systematic sensitivity of the analytic methodslowuraniniteK-179c  UraniniteUraniniteU262609Haystack Butte (Haystack Mountain), Ambrosia Lake Sub-district, Grants District, McKinley Co., New Mexico, USAAmbrosia LakeMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for Pb207-Pb206 analysis
Giersdorf_00000592555485520±35207Pb-206PbThe Pb207-Pb206 age given for these samples is described as being highly erroneous due to the systematic sensitivity of the analytic methodslowuraniniteK-194a  UraniniteUraniniteU48060Section 33 Mine, Ambrosia Lake Sub-district, Grants District, McKinley Co., New Mexico, USAAmbrosia LakeMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for Pb207-Pb206 analysis
Giersdorf_00000593837378±5238U-206U uraniniteK-194b  UraniniteUraniniteU48060Section 33 Mine, Ambrosia Lake Sub-district, Grants District, McKinley Co., New Mexico, USAAmbrosia LakeMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for U238-Pb206 analysis
Giersdorf_00000594113101107±6235U-207Pb uraniniteK-194b  UraniniteUraniniteU48060Section 33 Mine, Ambrosia Lake Sub-district, Grants District, McKinley Co., New Mexico, USAAmbrosia LakeMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for U235-Pb207 analysis
Giersdorf_00000595850790820±30207Pb-206PbThe Pb207-Pb206 age given for these samples is described as being highly erroneous due to the systematic sensitivity of the analytic methodslowuraniniteK-194b  UraniniteUraniniteU48060Section 33 Mine, Ambrosia Lake Sub-district, Grants District, McKinley Co., New Mexico, USAAmbrosia LakeMiller et al. (1963)10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2GSAB74_609Age given for Pb207-Pb206 analysis

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