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:
Johnson Co., Wyoming, USA

Oldest recorded age at locality: 2496.2
Youngest recorded age at locality: 2496.2

mindat Locality ID: 30941
mindat URL: http://www.mindat.org/loc-30941.html

Tectonic Settings:

Total number of sublocalities beneath "Johnson Co., Wyoming, USA": 358
Total number of bottom-level sublocalities: 355

Number of Child Localities: 193
Child Localities:
Beaver Creek
Benton Clay Bentonite Mine & Mill
Bentonite Draw
Big Horn Mine (Powder River Mine)
Big Horn Mountains No. 1
Big Horn Mountains No. 2
Big-B Mine
Buffalo
Bull Camp District
Bull Camp Group
Cottonwood Creek
Crazy Woman Creek
Durand No. 1 Occurrence (Benton Clay Company Pit)
Durand No. 2 Occurrence (Benton Clay Company)
Durande Mine
Kaycee Bentonite Corp No. 1 Occurrence
Kaycee Bentonite Corp No. 10 Occurrence
Kaycee Bentonite Corp No. 100 Occurrence
Kaycee Bentonite Corp No. 11 Occurrence
Kaycee Bentonite Corp No. 12 Occurrence
Kaycee Bentonite Corp No. 13 Occurrence
Kaycee Bentonite Corp No. 14 Occurrence
Kaycee Bentonite Corp No. 15 Occurrence
Kaycee Bentonite Corp No. 16 Occurrence
Kaycee Bentonite Corp No. 17 Occurrence
Kaycee Bentonite Corp No. 18 Occurrence
Kaycee Bentonite Corp No. 19 Occurrence
Kaycee Bentonite Corp No. 2 Occurrence
Kaycee Bentonite Corp No. 20 Occurrence
Kaycee Bentonite Corp No. 21 Occurrence
Kaycee Bentonite Corp No. 22 Occurrence
Kaycee Bentonite Corp No. 23 Occurrence
Kaycee Bentonite Corp No. 24 Occurrence
Kaycee Bentonite Corp No. 25 Occurrence
Kaycee Bentonite Corp No. 26 Occurrence
Kaycee Bentonite Corp No. 28 Occurrence
Kaycee Bentonite Corp No. 29 Occurrence
Kaycee Bentonite Corp No. 3 Occurrence
Kaycee Bentonite Corp No. 30 Occurrence
Kaycee Bentonite Corp No. 31 Occurrence
Kaycee Bentonite Corp No. 32 Occurrence
Kaycee Bentonite Corp No. 33 Occurrence
Kaycee Bentonite Corp No. 34 Occurrence
Kaycee Bentonite Corp No. 35 Occurrence
Kaycee Bentonite Corp No. 36 Occurrence
Kaycee Bentonite Corp No. 37 Occurrence
Kaycee Bentonite Corp No. 38 Occurrence
Kaycee Bentonite Corp No. 39 Occurrence
Kaycee Bentonite Corp No. 4 Occurrence
Kaycee Bentonite Corp No. 40 Occurrence
Kaycee Bentonite Corp No. 41 Occurrence
Kaycee Bentonite Corp No. 42 Occurrence
Kaycee Bentonite Corp No. 43 Occurrence
Kaycee Bentonite Corp No. 44 Occurrence
Kaycee Bentonite Corp No. 45 Occurrence
Kaycee Bentonite Corp No. 46 Occurrence
Kaycee Bentonite Corp No. 47 Occurrence
Kaycee Bentonite Corp No. 48 Occurrence
Kaycee Bentonite Corp No. 49 Occurrence
Kaycee Bentonite Corp No. 5 Occurrence
Kaycee Bentonite Corp No. 50 Occurrence
Kaycee Bentonite Corp No. 51 Occurrence
Kaycee Bentonite Corp No. 52 Occurrence
Kaycee Bentonite Corp No. 53 Occurrence
Kaycee Bentonite Corp No. 54 Occurrence
Kaycee Bentonite Corp No. 55 Occurrence
Kaycee Bentonite Corp No. 57 Occurrence
Kaycee Bentonite Corp No. 58 Occurrence
Kaycee Bentonite Corp No. 59 Occurrence
Kaycee Bentonite Corp No. 6 Occurrence
Kaycee Bentonite Corp No. 60 Occurrence
Kaycee Bentonite Corp No. 61 Occurrence
Kaycee Bentonite Corp No. 62 Occurrence
Kaycee Bentonite Corp No. 64 Occurrence
Kaycee Bentonite Corp No. 65 Occurrence
Kaycee Bentonite Corp No. 66 Occurrence
Kaycee Bentonite Corp No. 67 Occurrence
Kaycee Bentonite Corp No. 68 Occurrence
Kaycee Bentonite Corp No. 69 Occurrence
Kaycee Bentonite Corp No. 7 Occurrence
Kaycee Bentonite Corp No. 70 Occurrence
Kaycee Bentonite Corp No. 71 Occurrence
Kaycee Bentonite Corp No. 72 Occurrence
Kaycee Bentonite Corp No. 73 Occurrence
Kaycee Bentonite Corp No. 74 Occurrence
Kaycee Bentonite Corp No. 75 Occurrence
Kaycee Bentonite Corp No. 76 Occurrence
Kaycee Bentonite Corp No. 77 Occurrence
Kaycee Bentonite Corp No. 78 Occurrence
Kaycee Bentonite Corp No. 79 Occurrence
Kaycee Bentonite Corp No. 8 Occurrence
Kaycee Bentonite Corp No. 80 Occurrence
Kaycee Bentonite Corp No. 81 Occurrence
Kaycee Bentonite Corp No. 82 Occurrence
Kaycee Bentonite Corp No. 83 Occurrence
Kaycee Bentonite Corp No. 84 Occurrence
Kaycee Bentonite Corp No. 85 Occurrence
Kaycee Bentonite Corp No. 86 Occurrence
Kaycee Bentonite Corp No. 87 Occurrence
Kaycee Bentonite Corp No. 88 Occurrence
Kaycee Bentonite Corp No. 89 Occurrence
Kaycee Bentonite Corp No. 9 Occurrence
Kaycee Bentonite Corp No. 90 Occurrence
Kaycee Bentonite Corp No. 91 Occurrence
Kaycee Bentonite Corp No. 92 Occurrence
Kaycee Bentonite Corp No. 93 Occurrence
Kaycee Bentonite Corp No. 94 Occurrence
Kaycee Bentonite Corp No. 95 Occurrence
Kaycee Bentonite Corp No. 96 Occurrence
Kaycee Bentonite Corp No. 97 Occurrence
Kaycee Bentonite Corp No. 98 Occurrence
Kaycee Bentonite Corp No. 99 Occurrence
Kaycee Bentonite Corp. No. 27 Occurrence
Kaycee Bentonite Corporation No. 63 Occurrence
Kaycee Bentonite Mine No. 56 Occurrence
Keith Ditch
Kelley Creek (Buffalo) District
Kelly Creek
Kidd Ranch North End Occurrence
Mayoworth
Mayworth No. 1 Occurrence
Mayworth No. 10 Occurrence
Mayworth No. 11 Occurrence
Mayworth No. 2 Occurrence
Mayworth No. 5 Occurrence
Mayworth No. 6 Occurrence
Mayworth No. 7 & 8 Occurrence
Mayworth No. 9 Occurrence
Middle Fork Crazy Woman Creek
Mosier Gulch
Muddy Creek
Murphy Creek Area
North Fork Powder River No. 1
North Fork; Powder River No. 2
North Rock Creek
Pass Reservoir Area
Peterson Draw
Posey Creek Area
Powder River Mine
Powder River Pass Occurrence
Pumpkin Buttes Mining District
Red Fork No. 1
Red Fork No. 2
Red Fork Powder River Area No. 1
Red Fork Powder River Area No. 2
Roe Brothers Group
Shell Creek Occurrence
Sisters Hill
Slate Ridge No. 1 Occurrence (Benton Clay Company)
Slate Ridge No. 10 Occurrence
Slate Ridge No. 11 Occurrence
Slate Ridge No. 2 Occurrence (Benton Clay Company)
Slate Ridge No. 3 Occurrence
Slate Ridge No. 4 Occurrence (Benton Clay Company)
Slate Ridge No. 5 Occurrence
Slate Ridge No. 6 Occurrence
Slate Ridge No. 7 Occurrence
Slate Ridge No. 8 Occurrence
Slate Ridge No. 9 Occurrence
South Fork Crazy Woman Creek (MRDS - 10133557)
South Fork Crazy Woman Creek (MRDS - 10230571)
South Kaycee Mine
Spring Creek
Taylor Prospect
Tisdale No. 1 Occurrence
Tisdale No. 10 Occurrence
Tisdale No. 11 Occurrence
Tisdale No. 2 Occurrence
Tisdale No. 3 Occurrence
Tisdale No. 4 Occurrence
Tisdale No. 5 Occurrence
Tisdale No. 6 Occurrence
Tisdale No. 7 Occurrence
Tisdale No. 8 Occurrence
Tisdale No. 9 Occurrence
Top Hand Group
Unknown Clay - Bentonite (MRDS - 10133272)
Unknown Clay - Bentonite (MRDS - 10254821)
Unknown Clay - Bentonite Occurrence (MRDS - 10279175)
Unknown Clay - Bentonite Prospect (MRDS - 10230533)
Unknown Clay - Bentonite Prospect (MRDS - 10254160)
Unknown Gypsum-Anhydrite (MRDS - 10133083)
Unknown Gypsum-Anhydrite Occurrence (MRDS - 10181672)
Unknown Gypsum-Anhydrite Occurrence (MRDS - 10181967)
Unknown Magnesite Occurrence (MRDS - 10157302)
Unknown Manganese Occurrence (MRDS - 10254165)
Unknown Manganese Occurrence (MRDS - 10278608)
Unknown Manganese Prospect (MRDS - 10230078)
Unknown Stone - Crushed/Broken Prospect (MRDS - 10182009)
Unknown Stone - Crushed/Broken Prospect (MRDS - 10303278)
Unknown Uranium Occurrence (MRDS - 10206068)
Unknown Uranium Occurrence (MRDS - 10230411)
Willow Creek Uranium Mine

Latitude: 43°45'22"N
Longitude: 106°44'51"W
Decimal Degree (lat, lon): 43.756111111111,-106.7475

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 Au Be C Ca Cu Fe H K Mg Mn N O S Si U V 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AluniteBerylCopperCorundumCristobaliteFeldsparFluoriteFritzscheiteGypsumNone
Not in a structural groupQuartzRutileSapphirineSpinelTridymiteZircon

21 IMA Minerals at location:
Ammoniojarosite  (*)Anorthite  (*)Bayleyite  (*)Beryl  (*)Carnotite  (*)
Chalcocite  (*)Coffinite  (*)Cristobalite  (*)Cuprite  (*)Dorrite  (*)
Gold  (*)Gypsum  (*)Hematite  (*)Jarosite  (*)Magnesioferrite  (*)
Metatyuyamunite  (*)Pyrolusite  (*)Quartz  (*)Tridymite  (*)Tyuyamunite  (*)
Uraninite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Ammoniojarosite  (*)Alunite(NH4)Fe3+3(SO4)2(OH)6129247930
Anorthite  (*)FeldsparCa(Al2Si2O8)12924781036
Bayleyite  (*)NoneMg2(UO2)(CO3)3·18H2O129261538
Beryl  (*)BerylBe3Al2Si6O1812924764286
Carnotite  (*)NoneK2(UO2)2(VO4)2·3H2O3292629,292630,2926401184
Chalcocite  (*)NoneCu2S12924815707
Coffinite  (*)ZirconU(SiO4)·nH2O2292645,292650566
Cristobalite  (*)CristobaliteSiO21292478453
Cuprite  (*)Not in a structural groupCu2O12924812970
Dorrite  (*)SapphirineCa4[Mg3Fe3+9]O4[Si3Al8Fe3+O36]129247810
Gold  (*)CopperAu2292473,29258930554
Gypsum  (*)GypsumCa(SO4)·2H2O2292479,2925926890
Hematite  (*)CorundumFe2O3129247814640
Jarosite  (*)AluniteKFe3+3(SO4)2(OH)62292650,2926732228
Magnesioferrite  (*)SpinelMgFe3+2O4129247898
Metatyuyamunite  (*)FritzscheiteCa(UO2)2(VO4)2·3H2O1292593129
Pyrolusite  (*)RutileMnO212926403106
Quartz  (*)QuartzSiO23292473,292478,29264061156
Tridymite  (*)TridymiteSiO21292478458
Tyuyamunite  (*)NoneCa(UO2)2(VO4)2·5-8H2O1292650628
Uraninite  (*)FluoriteUO212926502718



1 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
USGS-Rb-Sr-001262496.22496.22496.2Rb-Srage of metamorphic crystallizationbiotite     173280Powder River Pass Occurrence, Johnson Co., Wyoming, USA USGS-Rb-Sr USGS-Rb-Sr 


SampleSource LocalityReference URL


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