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:
Kansas, USA

Oldest recorded age at locality: 1408.021
Youngest recorded age at locality: 64

mindat Locality ID: 3864
mindat URL: http://www.mindat.org/loc-3864.html

Tectonic Settings:

Total number of sublocalities beneath "Kansas, USA": 1039
Total number of bottom-level sublocalities: 761

Number of Child Localities: 105
Child Localities:
Allen Co.
Anderson Co.
Atchison Co.
Barber Co.
Barton Co.
Bourbon Co.
Brown Co.
Butler Co.
Chase Co.
Chautauqua Co.
Cherokee Co.
Cheyenne Co.
Clark Co.
Clay Co.
Cloud Co.
Coffey Co.
Comanche Co.
Cowley Co.
Crawford Co.
Decatur Co.
Dickinson Co.
Doniphan Co.
Douglas Co.
Edwards Co.
Elk Co.
Ellis Co.
Ellsworth Co.
Finney Co.
Ford Co.
Franklin Co.
Geary Co.
Gove Co.
Graham Co.
Grant Co.
Gray Co.
Greeley Co.
Greenwood Co.
Hamilton Co.
Harper Co.
Harvey Co.
Haskell Co.
Hodgeman Co.
Jackson Co.
Jefferson Co.
Jewell Co.
Johnson Co.
Kearny Co.
Kingman Co.
Kiowa Co.
Labette Co.
Lane Co.
Leavenworth Co.
Lincoln Co.
Linn Co.
Logan Co.
Lyon Co.
Marion Co.
Marshall Co.
McPherson Co.
Meade Co.
Miami Co.
Mitchell Co.
Montgomery Co.
Morris Co.
Morton Co.
Nemaha Co.
Neosho Co.
Ness Co.
Norton Co.
Osage Co.
Osborne Co.
Ottawa Co.
Pawnee Co.
Phillips Co.
Pottawatomie Co.
Pratt Co.
Rawlins Co.
Reno Co.
Republic Co.
Rice Co.
Riley Co.
Rooks Co.
Rush Co.
Russell Co.
Saline Co.
Scott Co.
Sedgwick Co.
Seward Co.
Shawnee Co.
Sheridan Co.
Sherman Co.
Smith Co.
Stafford Co.
Stanton Co.
Stevens Co.
Sumner Co.
Thomas Co.
Trego Co.
Wabaunsee Co.
Wallace Co.
Washington Co.
Wichita Co.
Wilson Co.
Woodson Co.
Wyandotte Co.

Latitude: 38°25'35"N
Longitude: 98°14'1"W
Decimal Degree (lat, lon): 38.426388888889,-98.233611111111

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 Cd Ce Cl Cr Cu F Fe H K Mg Mn N Na Ni O P Pb S Si Sr Ti V Zn Zr 

Elements from minerals reported directly at this locality: Al H O S 

Structural Groups for minerals in this locality: 
AllophaneAluniteAmorphousAmphiboleApatiteAragoniteBaddeleyiteBaryteCalciteCaledonite
Cancrinite-sodaliteCeriteChalcopyriteChevkiniteClayCopperCorrensiteCorundumCovelliteCristobalite
CubaniteDiamondDiasporeDigeniteEnargiteEpsomiteFeldsparFluoriteGarnetGypsum
IronKaoliniteLinariteMagnetoplumbiteMalachiteMarcasiteMeliliteMicaNickelineNolanite
NoneNot in a structural groupOlivinePectolitePentlanditePerovskitePyritePyroxeneQuartzRocksalt
RutileSapphirineScacchiteSerpentineSmectite-vermiculiteSodaliteSphaleriteSpinelStanniteStarkeyite
TalcTridymiteWilkmaniteWollastoniteWurtziteZircon

125 IMA Minerals at location:
Alabandite  (*)Albite  (*)Allophane  (*)Andradite  (*)Anglesite  (*)
Anhydrite  (*)Anilite  (*)Anorthite  (*)Aragonite  (*)Augite  (*)
Aurichalcite  (*)Azurite  (*)Baddeleyite  (*)Baryte  (*)Bornite  (*)
Brezinaite  (*)Calcite  (*)Caledonite  (*)Carletonmooreite  (*)Caswellsilverite  (*)
Celestine  (*)Cerussite  (*)Chalcocite  (*)Chalcopyrite  (*)Chevkinite-(Ce)  (*)
Chlorapatite  (*)Chromite  (*)Chrysocolla  (*)Clinoenstatite  (*)Cohenite  (*)
Copper  (*)Corrensite  (*)Covellite  (*)Cristobalite  (*)Cronusite  (*)
Cubanite  (*)Cuprite  (*)Daubréelite  (*)Diamond  (*)Dickite  (*)
Digenite  (*)Diopside  (*)Dolomite  (*)Enargite  (*)Enstatite  (*)
Fayalite  (*)Felsőbányaite  (*)Ferrihydrite  (*)Fluorite  (*)Forsterite  (*)
Galena  (*)Gehlenite  (*)Goethite  (*)Goldmanite  (*)Goslarite  (*)
Graphite  (*)Greenockite  (*)Grossite  (*)Grossular  (*)Gypsum  (*)
Halite  (*)Hematite  (*)Hemimorphite  (*)Hercynite  (*)Hibonite  (*)
Hydrobasaluminite  (*)Hydrozincite  (*)Ilmenite  (*)Iron  (*)Isocubanite  (*)
Jarosite  (*)Kaersutite  (*)Kaolinite  (*)Linarite  (*)Lizardite  (*)
Luzonite  (*)Mackinawite  (*)Magnetite  (*)Majorite  (*)Malachite  (*)
Manganite  (*)Marcasite  (*)Merrillite  (*)Moissanite  (*)Montmorillonite  (*)
Muscovite  (*)Nepheline  (*)Nickelphosphide  (*)Nierite  (*)Niningerite  (*)
Oldhamite  (*)Opal  (*)Pectolite  (*)Pentlandite  (*)Perovskite  (*)
Perryite  (*)Phlogopite  (*)Pigeonite  (*)Plumbojarosite  (*)Pyrite  (*)
Pyrope  (*)Pyrrhotite  (*)Quartz  (*)Richterite  (*)Ringwoodite  (*)
Rozenite  (*)Rutile  (*)Sanidine  (*)Sapphirine  (*)Schöllhornite  (*)
Schreibersite  (*)Siderite  (*)Sillimanite  (*)Smithsonite  (*)Sodalite  (*)
Sphalerite  (*)Spinel  (*)Taenite  (*)Talc  (*)Tetrataenite  (*)
Tridymite  (*)Troilite  (*)Vermiculite  (*)Wollastonite  (*)Zircon  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Alabandite  (*)RocksaltMnS2215246,215252312
Albite  (*)FeldsparNa(AlSi3O8)12153158803
Allophane  (*)AllophaneAl2O3(SiO2)1.3-2.0·2.5-3.0H2O68641215106470
Andradite  (*)GarnetCa3Fe3+2(SiO4)312151411534
Anglesite  (*)BarytePb(SO4)686412151062734
Anhydrite  (*)Not in a structural groupCa(SO4)12152631588
Anilite  (*)DigeniteCu7S4121530688
Anorthite  (*)FeldsparCa(Al2Si2O8)4215141,215179,215225,2152461036
Aragonite  (*)AragoniteCa(CO3)12153193250
Augite  (*)Pyroxene(Ca,Mg,Fe)2Si2O63215141,215223,2153192060
Aurichalcite  (*)None(Zn,Cu)5(CO3)2(OH)668641215106919
Azurite  (*)Not in a structural groupCu3(CO3)2(OH)22215289,2153065509
Baddeleyite  (*)BaddeleyiteZrO21215141238
Baryte  (*)BaryteBa(SO4)68649215043,215056,215153,215158,215159,215161,215207,215284,21530611547
Bornite  (*)NoneCu5FeS412152895516
Brezinaite  (*)WilkmaniteCr3S412152467
Calcite  (*)CalciteCa(CO3)1408.0216482215043,215046,215057,215058,215059,215060,215061,215062,215063,215064,215065,215066,215068,215069,215070,215071,215072,215073,215074,215075,215076,215077,215078,215079,215080,215081,215082,215083,215084,215085,215086,215087,215088,215089,215090,215091,215092,215093,215097,215102,215104,215105,215108,215109,215111,215115,215116,215117,215123,215124,215125,215126,215127,215133,215141,215143,215158,215159,215161,215162,215163,215183,215200,215206,215207,215209,215211,215212,215224,215230,215242,215245,215248,215269,215270,215273,215275,215289,215308,215313,215319,21532027770
Caledonite  (*)CaledoniteCu2Pb5(SO4)3(CO3)(OH)668641215106359
Carletonmooreite  (*)NoneNi3Si12152461
Caswellsilverite  (*)ScacchiteNaCrS212152465
Celestine  (*)BaryteSr(SO4)6215051,215052,215151,215281,215312,2153141252
Cerussite  (*)AragonitePb(CO3)686412151144979
Chalcocite  (*)NoneCu2S2215238,2153065707
Chalcopyrite  (*)ChalcopyriteCuFeS2686460215043,215054,215057,215058,215059,215060,215061,215062,215063,215064,215065,215066,215068,215069,215070,215071,215072,215073,215074,215075,215076,215077,215078,215079,215080,215081,215082,215083,215084,215085,215086,215087,215088,215089,215090,215091,215092,215093,215097,215101,215108,215109,215111,215115,215116,215117,215123,215124,215125,215126,215127,215158,215183,215200,215209,215211,215238,215275,215289,21530627198
Chevkinite-(Ce)  (*)ChevkiniteCe4(Ti,Fe2+,Fe3+)5O8(Si2O7)2121522889
Chlorapatite  (*)ApatiteCa5(PO4)3Cl1215251203
Chromite  (*)SpinelFe2+Cr2O433215044,215134,215141,215142,215160,215166,215168,215171,215173,215175,215176,215179,215185,215214,215217,215223,215225,215233,215244,215251,215254,215257,215259,215260,215279,215280,215286,215287,215294,215296,215299,215304,2153153902
Chrysocolla  (*)Allophane(Cu2-xAlx)H2-xSi2O5(OH)4·nH2O686412151063531
Clinoenstatite  (*)PyroxeneMg2Si2O63215141,215142,21524694
Cohenite  (*)PerovskiteCFe3121522377
Copper  (*)CopperCu23215044,215134,215142,215160,215167,215168,215171,215175,215176,215185,215198,215214,215233,215246,215251,215254,215257,215259,215260,215287,215294,215296,2153153846
Corrensite  (*)Corrensite Clay(Ca,Na,K)1-x(Mg,Fe,Al)9(Si,Al)8O20(OH)10·nH2O2215263,21526649
Covellite  (*)CovelliteCuS68642215094,2151064165
Cristobalite  (*)CristobaliteSiO21215315453
Cronusite  (*)NoneCa0.2CrS2·2H2O12152461
Cubanite  (*)Cubanite WurtziteCuFe2S32215198,215246802
Cuprite  (*)Not in a structural groupCu2O68642215106,2152382970
Daubréelite  (*)SpinelFeCr2S42215246,215252157
Diamond  (*)DiamondC2215141,215225697
Dickite  (*)Clay KaoliniteAl2Si2O5(OH)42215211,215242651
Digenite  (*)DigeniteCu1.8S3215183,215289,2153061027
Diopside  (*)PyroxeneCaMgSi2O61408.0211407.97914215141,215160,215173,215214,215244,215246,215251,215252,215257,215279,215286,215298,215315,2153184135
Dolomite  (*)NoneCaMg(CO3)21408.0216484215043,215053,215054,215057,215058,215059,215060,215061,215062,215063,215064,215065,215066,215068,215069,215070,215071,215072,215073,215074,215075,215076,215077,215078,215079,215080,215081,215082,215083,215084,215085,215086,215087,215088,215089,215090,215091,215092,215093,215097,215108,215109,215110,215111,215113,215114,215116,215117,215121,215122,215123,215124,215125,215126,215127,215129,215130,215133,215135,215143,215181,215184,215194,215200,215206,215207,215209,215211,215212,215218,215220,215224,215227,215235,215238,215242,215249,215263,215268,215283,215289,215305,215314,2153189895
Enargite  (*)Enargite WurtziteCu3AsS468645215105,215116,215119,215121,215122910
Enstatite  (*)PyroxeneMg2Si2O67215141,215233,215246,215252,215254,215294,215304944
Fayalite  (*)OlivineFe2+2(SiO4)2215141,215217371
Felsőbányaite  (*)NoneAl4(SO4)(OH)10·4H2O1408.0211407.979066
Ferrihydrite  (*)NolaniteFe3+10O14(OH)2121514186
Fluorite  (*)FluoriteCaF212152429617
Forsterite  (*)OlivineMg2(SiO4)6215141,215142,215179,215239,215246,2152521188
Galena  (*)RocksaltPbS686462215057,215058,215059,215060,215061,215062,215063,215064,215065,215066,215068,215069,215070,215071,215072,215073,215074,215075,215076,215077,215078,215079,215080,215081,215082,215083,215084,215085,215086,215087,215088,215089,215090,215091,215092,215093,215094,215096,215097,215098,215100,215102,215105,215106,215109,215111,215112,215114,215116,215117,215118,215119,215121,215122,215123,215124,215125,215126,215127,215200,215207,21521224243
Gehlenite  (*)MeliliteCa2Al(SiAl)O71215141114
Goethite  (*)DiasporeFeO(OH)2215151,2151647437
Goldmanite  (*)GarnetCa3V3+2(SiO4)3121514131
Goslarite  (*)EpsomiteZn(SO4)·7H2O68642215094,215105188
Graphite  (*)NoneC4215141,215214,215217,2153042812
Greenockite  (*)WurtziteCdS68641215094717
Grossite  (*)NoneCaAl4O7121514119
Grossular  (*)GarnetCa3Al2(SiO4)312151411544
Gypsum  (*)GypsumCa(SO4)·2H2O686413215046,215114,215116,215133,215143,215150,215183,215220,215222,215246,215263,215282,2152896890
Halite  (*)RocksaltNaCl42215046,215048,215129,215133,215147,215151,215152,215154,215155,215172,215174,215180,215181,215184,215186,215187,215193,215194,215202,215204,215213,215224,215227,215243,215248,215250,215256,215263,215265,215277,215281,215284,215285,215288,215290,215295,215300,215305,215307,215308,215313,2153161398
Hematite  (*)CorundumFe2O31408.0211407.9797215151,215164,215225,215269,215273,215319,21532014640
Hemimorphite  (*)Not in a structural groupZn4(Si2O7)(OH)2·H2O686412150941689
Hercynite  (*)SpinelFe2+Al2O41215141407
Hibonite  (*)MagnetoplumbiteCaAl12O192215141,21522580
Hydrobasaluminite  (*)NoneAl4(SO4)(OH)10·15H2O1408.0211407.979012
Hydrozincite  (*)NoneZn5(CO3)2(OH)6686412150941066
Ilmenite  (*)CorundumFe2+Ti4+O325215044,215142,215160,215166,215167,215168,215171,215176,215179,215185,215214,215225,215233,215244,215251,215254,215257,215275,215280,215287,215294,215296,215299,215304,2153155433
Iron  (*)IronFe37215044,215134,215141,215142,215160,215166,215167,215168,215170,215171,215175,215176,215185,215198,215214,215216,215217,215223,215225,215233,215239,215244,215246,215251,215252,215254,215257,215259,215260,215280,215286,215287,215294,215296,215299,215304,2153151089
Isocubanite  (*)Sphalerite CubaniteCuFe2S316215134,215160,215166,215170,215176,215214,215251,215254,215260,215280,215287,215294,215296,215299,215304,215315191
Jarosite  (*)AluniteKFe3+3(SO4)2(OH)612151642228
Kaersutite  (*)AmphiboleNaCa2(Mg3AlTi4+)(Si6Al2)O22O21215275179
Kaolinite  (*)Clay KaoliniteAl2Si2O5(OH)42215206,2152115591
Linarite  (*)LinariteCuPb(SO4)(OH)268641215106987
Lizardite  (*)Serpentine ClayMg3Si2O5(OH)41215273359
Luzonite  (*)Stannite SphaleriteCu3AsS468642215108,215114198
Mackinawite  (*)None(Fe,Ni)1+xS (x = 0-0.07)8215134,215160,215176,215214,215254,215294,215296,215299451
Magnetite  (*)SpinelFe2+Fe3+2O41408.0211407.97910215141,215217,215219,215269,215270,215294,215315,215318,215319,21532014899
Majorite  (*)GarnetMg3(MgSi)(SiO4)3121524424
Malachite  (*)MalachiteCu2(CO3)(OH)268646215106,215121,215183,215238,215289,21530612537
Manganite  (*)RutileMn3+O(OH)1215246770
Marcasite  (*)MarcasiteFeS2686451215057,215058,215059,215060,215061,215062,215063,215064,215065,215066,215068,215069,215070,215071,215072,215073,215074,215075,215076,215077,215078,215079,215080,215081,215082,215083,215084,215085,215086,215087,215088,215089,215090,215091,215092,215093,215094,215096,215100,215109,215111,215116,215117,215118,215123,215124,215125,215126,215127,215158,2152005674
Merrillite  (*)CeriteCa9NaMg(PO4)77215142,215179,215223,215225,215233,215251,215315230
Moissanite  (*)WurtziteSiC121522557
Montmorillonite  (*)Clay Smectite-vermiculite(Na,Ca)0.3(Al,Mg)2Si4O10(OH)2·nH2O12151641508
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)21408.0211407.9793215263,215319,21532017380
Nepheline  (*)TridymiteNa3K(Al4Si4O16)2215141,215142884
Nickelphosphide  (*)NoneNi3P121522519
Nierite  (*)NoneSi3N412152257
Niningerite  (*)RocksaltMgS2215246,21525228
Oldhamite  (*)RocksaltCaS121524658
Opal  (*)AmorphousSiO2·nH2O3215129,215213,2153132994
Pectolite  (*)PectoliteNaCa2Si3O8(OH)2215318,215319363
Pentlandite  (*)Pentlandite(Ni,Fe)9S84215176,215217,215279,2152871512
Perovskite  (*)PerovskiteCaTiO33215141,215318,215319495
Perryite  (*)None(Ni,Fe)8(Si,P)3121524625
Phlogopite  (*)Mica ClayKMg3(AlSi3O10)(OH)21408.0211407.9795215270,215275,215318,215319,2153202273
Pigeonite  (*)Pyroxene(Mg,Fe,Ca)2Si2O62215173,215179303
Plumbojarosite  (*)AlunitePb0.5Fe3+3(SO4)2(OH)668641215121477
Pyrite  (*)PyriteFeS21408.0216461215043,215056,215057,215058,215059,215060,215061,215062,215063,215064,215065,215066,215068,215069,215070,215071,215072,215073,215074,215075,215076,215077,215078,215079,215080,215081,215082,215083,215084,215085,215086,215087,215088,215089,215090,215091,215092,215093,215096,215097,215109,215111,215116,215117,215123,215124,215125,215126,215127,215151,215159,215164,215183,215200,215209,215211,215289,215306,215319,215320,21532439462
Pyrope  (*)GarnetMg3Al2(SiO4)33215269,215270,215275341
Pyrrhotite  (*)NickelineFe7S82215141,2152759056
Quartz  (*)QuartzSiO21408.0216477215047,215054,215057,215058,215059,215060,215061,215062,215063,215064,215065,215066,215068,215069,215070,215071,215072,215073,215074,215075,215076,215077,215078,215079,215080,215081,215082,215083,215084,215085,215086,215087,215088,215089,215090,215091,215092,215093,215094,215097,215101,215102,215109,215111,215116,215117,215123,215124,215125,215126,215127,215129,215130,215131,215162,215164,215181,215190,215200,215206,215211,215213,215220,215238,215242,215248,215263,215306,215308,215309,215313,215317,215318,215319,215320,215321,21532461156
Richterite  (*)AmphiboleNa(NaCa)Mg5Si8O22(OH)22215318,215319148
Ringwoodite  (*)SpinelSiMg2O4121524425
Rozenite  (*)StarkeyiteFe2+(SO4)·4H2O1215201293
Rutile  (*)RutileTiO23215214,215225,2153155614
Sanidine  (*)FeldsparK(AlSi3O8)1408.0211407.9791215318598
Sapphirine  (*)SapphirineMg4(Mg3Al9)O4[Si3Al9O36]1215275129
Schöllhornite  (*)NoneNa0.3CrS2·H2O12152464
Schreibersite  (*)None(Fe,Ni)3P6215170,215185,215198,215214,215246,215252374
Siderite  (*)CalciteFe(CO3)2215049,2151516417
Sillimanite  (*)Not in a structural groupAl2SiO512152751516
Smithsonite  (*)CalciteZn(CO3)686412150562473
Sodalite  (*)Cancrinite-sodalite SodaliteNa4(Si3Al3)O12Cl1215141444
Sphalerite  (*)SphaleriteZnS686468215043,215057,215058,215059,215060,215061,215062,215063,215064,215065,215066,215068,215069,215070,215071,215072,215073,215074,215075,215076,215077,215078,215079,215080,215081,215082,215083,215084,215085,215086,215087,215088,215089,215090,215091,215092,215093,215094,215096,215097,215100,215101,215102,215105,215106,215109,215111,215116,215117,215118,215122,215123,215124,215125,215126,215127,215146,215158,215159,215200,215206,215207,215208,215209,215211,215212,215242,21532421482
Spinel  (*)SpinelMgAl2O41408.0211407.9797215141,215175,215225,215246,215257,215315,2153181934
Taenite  (*)None(Ni,Fe)33215044,215134,215141,215142,215160,215167,215168,215170,215171,215175,215176,215185,215198,215214,215216,215217,215223,215225,215233,215244,215246,215251,215252,215254,215257,215260,215286,215287,215294,215296,215299,215304,215315703
Talc  (*)Clay TalcMg3Si4O10(OH)212153193337
Tetrataenite  (*)NoneFeNi3215142,215198,215246116
Tridymite  (*)TridymiteSiO23215142,215179,215246458
Troilite  (*)NoneFeS37215044,215134,215141,215142,215160,215166,215167,215168,215170,215171,215175,215176,215179,215185,215198,215214,215217,215225,215233,215239,215244,215246,215251,215252,215254,215257,215259,215260,215279,215280,215286,215287,215294,215296,215299,215304,2153151044
Vermiculite  (*)Clay Smectite-vermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4·8H2O1215319652
Wollastonite  (*)WollastoniteCaSiO312151411247
Zircon  (*)ZirconZr(SiO4)12152385251



Locality Notes from all Ages at Locality:
Age IDLocality Notes
Jen_0000137granite (xenolith in kimberlite)


2 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
Jen_00001371408.0211407.9791408±0.021U-Pb zircon   Zircon  273454Rose Dome, Woodson Co., Kansas, USARose Dome Granite (Xenolith in Kimberlite), Woodson Co., KansasAnderson (1983)10.1130/MEM161-p133GSAM161_133an absence of older rocks indicating this anorogenic belt may have cut across what was an inactive continental margin
G28_795_001686466±2U-Pb calcite  YesCalcite  12395Picher Field, Tri-State District, Ottawa Co., Oklahoma, USAPicher fieldCoveney et al. (2000) G28_795 


SampleSource LocalityReference URL


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