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:
Ohio, USA

Oldest recorded age at locality: 931.68
Youngest recorded age at locality: 359

mindat Locality ID: 4048
mindat URL: http://www.mindat.org/loc-4048.html

Tectonic Settings:

Total number of sublocalities beneath "Ohio, USA": 933
Total number of bottom-level sublocalities: 538

Number of Child Localities: 88
Child Localities:
Adams Co.
Allen Co.
Ashland Co.
Ashtabula Co.
Athens Co.
Auglaize Co.
Belmont Co.
Brown Co.
Butler Co.
Carroll Co.
Champaign Co.
Clark Co.
Clermont Co.
Clinton Co.
Columbiana Co.
Coshocton Co.
Crawford Co.
Cuyahoga Co.
Darke Co.
Defiance Co.
Delaware Co.
Erie Co.
Fairfield Co.
Fayette Co.
Franklin Co.
Fulton Co.
Gallia Co.
Geauga Co.
Greene Co.
Guernsey Co.
Hamilton Co.
Hancock Co.
Hardin Co.
Harrison Co.
Henry Co.
Highland Co.
Hocking Co.
Holmes Co.
Huron Co.
Jackson Co.
Jefferson Co.
Knox Co.
Lake Co.
Lawrence Co.
Licking Co.
Logan Co.
Lorain Co.
Lucas Co.
Madison Co.
Mahoning Co.
Marion Co.
Medina Co.
Meigs Co.
Mercer Co.
Miami Co.
Monroe Co.
Montgomery Co.
Morgan Co.
Morrow Co.
Muskingum Co.
Noble Co.
Ottawa Co.
Paulding Co.
Perry Co.
Pickaway Co.
Pike Co.
Portage Co.
Preble Co.
Putnam Co.
Richland Co.
Ross Co.
Sandusky Co.
Scioto Co.
Seneca Co.
Shelby Co.
Stark Co.
Summit Co.
Trumbull Co.
Tuscarawas Co.
Union Co.
Van Wert Co.
Vinton Co.
Warren Co.
Washington Co.
Wayne Co.
Williams Co.
Wood Co.
Wyandot Co.

Latitude: 40°18'36"N
Longitude: 82°51'37"W
Decimal Degree (lat, lon): 40.31,-82.860277777778

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The 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.

Adranosite	Alum	Alunite	Amorphous	Apatite	Aphthitalite	Aragonite	Arcanite	Baryte	Botryogen
Calcite	Cerite	Chalcopyrite	Clay	Copiapite	Copper	Corundum	Cubanite	Diamond	Diaspore
Epsomite	Feldspar	Fluorite	Gypsum	Halotrichite	Hexahydrite	Iron	Kaolinite	Kieserite	Malachite
Marcasite	Melanterite	Metavoltine	Mica	Millerite	None	Not in a structural group	Oxalate	Picromerite	Pyracmonite
Pyrite	Pyroxene	Quartz	Rocksalt	Rutile	Sabieite	Sphalerite	Spinel	Starkeyite	Sulphur
Vivianite	Voltaite	Wurtzite	Zircon

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 Ba C Ca Cl Cr Cu F Fe H K Mg Mn N Na Ni O P Pb S Si Sr Ti Zn Zr

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Adranosite Alum Alunite Amorphous Apatite Aphthitalite Aragonite Arcanite Baryte Botryogen
Calcite Cerite Chalcopyrite Clay Copiapite Copper Corundum Cubanite Diamond Diaspore
Epsomite Feldspar Fluorite Gypsum Halotrichite Hexahydrite Iron Kaolinite Kieserite Malachite
Marcasite Melanterite Metavoltine Mica Millerite None Not in a structural group Oxalate Picromerite Pyracmonite
Pyrite Pyroxene Quartz Rocksalt Rutile Sabieite Sphalerite Spinel Starkeyite Sulphur
Vivianite Voltaite Wurtzite Zircon

85 IMA Minerals at location:

Adranosite-(Fe) ()*	Alabandite ()*	Albite ()*	Alum-(K) ()*	Alunogen ()*
Ammoniomagnesiovoltaite ()*	Anhydrite ()*	Anorthite ()*	Aragonite ()*	Baryte ()*
Botryogen ()*	Boussingaultite ()*	Brianite ()*	Calcite ()*	Carlsonite ()*
Celestine ()*	Cerussite ()*	Chalcopyrite ()*	Chlorapatite ()*	Chromite ()*
Clairite ()*	Copiapite ()*	Copper ()*	Diadochite ()*	Diamond ()*
Diopside ()*	Dolomite ()*	Epsomite ()*	Fluorite ()*	Galena ()*
Goethite ()*	Gold ()*	Graphite ()*	Gypsum ()*	Halite ()*
Halotrichite ()*	Hematite ()*	Hemimorphite ()*	Hexahydrite ()*	Huizingite-(Al) ()*
Hydrozincite ()*	Ilmenite ()*	Iron ()*	Isocubanite ()*	Jarosite ()*
Kaolinite ()*	Kremersite ()*	Lonecreekite ()*	Magnetite ()*	Malachite ()*
Marcasite ()*	Mascagnite ()*	Melanterite ()*	Merrillite ()*	Metavoltine ()*
Microcline ()*	Millerite ()*	Muscovite ()*	Opal ()*	Orthoclase ()*
Panethite ()*	Pickeringite ()*	Pyracmonite ()*	Pyrite ()*	Quartz ()*
Rozenite ()*	Rutile ()*	Sabieite ()*	Salammoniac ()*	Schreibersite ()*
Siderite ()*	Smithsonite ()*	Sphalerite ()*	Strontianite ()*	Sulphur ()*
Szomolnokite ()*	Taenite ()*	Thénardite ()*	Troilite ()*	Tschermigite ()*
Vivianite ()*	Voltaite ()*	Whewellite ()*	Wurtzite ()*	Zircon ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Adranosite-(Fe) ()*	Adranosite	(NH₄)₄NaFe₂(SO₄)₄Cl(OH)₂			1	253944	6
Alabandite ()*	Rocksalt	MnS			1	253668	312
Albite ()*	Feldspar	Na(AlSi₃O₈)			2	253668,254136	8803
Alum-(K) ()*	Alum	KAl(SO₄)₂·12H₂O			3	254264,254303,254311	92
Alunogen ()*	Not in a structural group	Al₂(SO₄)₃(H₂O)₁₂·5H₂O	383	359	4	253797,253944,253949,254085	272
Ammoniomagnesiovoltaite ()*	Voltaite	(NH₄)₂Mg₅Fe³⁺₃Al(SO₄)₁₂·18H₂O			1	253944	3
Anhydrite ()*	Not in a structural group	Ca(SO₄)			14	253535,253609,253726,253862,253944,253983,254060,254154,254169,254170,254285,254313,254319,254394	1588
Anorthite ()*	Feldspar	Ca(Al₂Si₂O₈)			1	253538	1036
Aragonite ()*	Aragonite	Ca(CO₃)	383	359	10	253700,253766,253797,253798,253947,253949,254004,254132,254387,254394	3250
Baryte ()*	Baryte	Ba(SO₄)	383	359	52	253486,253496,253505,253518,253523,253622,253653,253655,253661,253687,253715,253746,253750,253757,253758,253766,253776,253797,253798,253808,253810,253831,253852,253893,253945,253947,253949,253950,253960,253961,253998,254001,254044,254045,254064,254071,254131,254166,254175,254220,254245,254261,254262,254292,254293,254323,254324,254340,254383,254394,254406,254408	11547
Botryogen ()*	Botryogen	MgFe³⁺(SO₄)₂(OH)·7H₂O	383	359	4	253797,253798,253949,254085	45
Boussingaultite ()*	Picromerite	(NH₄)₂Mg(SO₄)₂·6H₂O			1	253944	30
Brianite ()*	Aphthitalite	Na₂CaMg(PO₄)₂			1	254108	3
Calcite ()*	Calcite	Ca(CO₃)	931.68	359	194	253486,253488,253489,253494,253496,253503,253504,253505,253506,253507,253516,253518,253523,253527,253528,253530,253533,253536,253546,253563,253583,253601,253608,253629,253653,253655,253665,253682,253684,253687,253700,253709,253716,253740,253742,253744,253745,253746,253748,253750,253757,253761,253762,253763,253766,253769,253770,253772,253773,253776,253779,253788,253790,253794,253796,253797,253798,253801,253803,253804,253807,253808,253810,253829,253831,253851,253852,253854,253857,253859,253861,253883,253886,253890,253891,253893,253897,253898,253904,253909,253913,253915,253916,253919,253920,253921,253926,253927,253928,253929,253945,253947,253949,253954,253960,253961,253986,253998,254004,254010,254012,254014,254016,254027,254033,254035,254037,254039,254042,254044,254045,254046,254047,254049,254050,254051,254052,254053,254055,254059,254064,254075,254077,254079,254093,254095,254097,254099,254100,254103,254124,254140,254153,254154,254155,254160,254166,254173,254174,254175,254178,254180,254185,254187,254205,254207,254210,254220,254225,254228,254230,254232,254242,254245,254251,254253,254255,254259,254261,254262,254269,254272,254273,254274,254277,254279,254280,254284,254287,254302,254329,254343,254345,254348,254351,254353,254354,254370,254383,254387,254390,254392,254393,254394,254395,254397,254400,254404,254406,254408,254411,254412,254413,254416	27770
Carlsonite ()*	Metavoltine	(NH₄)₅Fe³⁺₃O(SO₄)₆·7H₂O			1	253944	1
Celestine ()*	Baryte	Sr(SO₄)	931.68	931.68	50	253511,253653,253682,253779,253851,253852,254033,254035,254044,254046,254049,254052,254055,254079,254152,254153,254154,254155,254160,254162,254167,254170,254171,254173,254175,254176,254178,254180,254248,254249,254253,254255,254259,254261,254262,254269,254271,254277,254279,254280,254392,254393,254394,254399,254400,254401,254406,254408,254411,254416	1252
Cerussite ()*	Aragonite	Pb(CO₃)			1	254259	4979
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	383	359	10	253655,253687,253797,253831,254064,254071,254187,254220,254302,254383	27198
Chlorapatite ()*	Apatite	Ca₅(PO₄)₃Cl			1	254136	203
Chromite ()*	Spinel	Fe²⁺Cr₂O₄			2	253668,254136	3902
Clairite ()*	None	(NH₄)₂Fe³⁺₃(SO₄)₄(OH)₃·3H₂O			1	253944	8
Copiapite ()*	Copiapite	Fe²⁺Fe³⁺₄(SO₄)₆(OH)₂·20H₂O	383	359	5	253687,253797,253949,254085,254193	382
Copper ()*	Copper	Cu			1	254136	3846
Diadochite ()*	Amorphous	Fe³⁺₂(PO₄)(SO₄)(OH)·6H₂O			2	253699,254194	81
Diamond ()*	Diamond	C			6	253672,253678,253723,253846,254068,254304	697
Diopside ()*	Pyroxene	CaMgSi₂O₆			1	254136	4135
Dolomite ()*	None	CaMg(CO₃)₂	931.68	359	70	253489,253491,253496,253505,253507,253518,253520,253521,253527,253530,253533,253535,253609,253653,253655,253657,253682,253766,253776,253796,253797,253798,253829,253831,253857,253859,253861,253862,253945,253947,253949,253983,254004,254012,254014,254016,254035,254044,254060,254079,254093,254095,254097,254099,254154,254155,254160,254173,254205,254210,254245,254259,254261,254262,254277,254279,254284,254285,254313,254319,254348,254351,254353,254392,254394,254400,254406,254408,254411,254413	9895
Epsomite ()*	Epsomite	Mg(SO₄)·7H₂O	383	359	3	253797,253949,254306	484
Fluorite ()*	Fluorite	CaF₂	383	359	59	253485,253518,253527,253530,253533,253709,253742,253762,253763,253771,253779,253851,253852,253854,253857,253942,254014,254016,254033,254035,254045,254049,254077,254079,254153,254154,254155,254160,254161,254166,254171,254173,254174,254175,254187,254228,254230,254232,254251,254255,254256,254257,254259,254261,254262,254271,254277,254279,254343,254348,254351,254353,254392,254394,254397,254406,254408,254411,254413	9617
Galena ()*	Rocksalt	PbS			21	253693,253752,253818,253861,253949,254003,254007,254155,254160,254253,254255,254259,254261,254262,254277,254279,254354,254383,254387,254392,254394	24243
Goethite ()*	Diaspore	FeO(OH)	383	359	4	253653,253777,253797,254007	7437
Gold ()*	Copper	Au			18	253648,253662,253669,253671,253674,253676,253679,253980,253996,253997,254004,254069,254234,254235,254241,254243,254275,254366	30554
Graphite ()*	None	C			1	254108	2812
Gypsum ()*	Gypsum	Ca(SO₄)·2H₂O	931.68	359	54	253496,253535,253595,253687,253715,253717,253727,253738,253760,253797,253851,253944,253949,253984,253986,254033,254035,254039,254049,254051,254062,254063,254064,254065,254066,254153,254154,254155,254164,254169,254170,254180,254212,254216,254218,254237,254298,254299,254300,254302,254303,254307,254311,254312,254319,254358,254362,254378,254385,254394,254397,254400,254411,254416	6890
Halite ()*	Rocksalt	NaCl			28	253534,253535,253609,253657,253683,253726,253822,253832,253862,253937,253959,253983,254017,254040,254049,254060,254080,254101,254141,254174,254214,254285,254297,254313,254319,254371,254381,254417	1398
Halotrichite ()*	Halotrichite	Fe²⁺Al₂(SO₄)₄·22H₂O			4	253944,253949,254245,254360	409
Hematite ()*	Corundum	Fe₂O₃			47	253502,253503,253506,253519,253541,253543,253544,253547,253566,253572,253573,253576,253579,253580,253681,253692,253817,253820,253885,253895,253899,253911,253929,253930,253931,253933,253983,253988,253993,253995,254083,254087,254089,254090,254115,254117,254135,254148,254189,254190,254201,254202,254223,254263,254378,254379,254380	14640
Hemimorphite ()*	Not in a structural group	Zn₄(Si₂O₇)(OH)₂·H₂O			1	253498	1689
Hexahydrite ()*	Hexahydrite	Mg(SO₄)·6H₂O	383	359	13	253487,253512,253715,253797,253850,253889,253949,254179,254254,254406,254408,254410,254414	251
Huizingite-(Al) ()*	Not in a structural group	(NH₄)₉Al₃(SO₄)₈(OH)₂·4H₂O			1	253944	2
Hydrozincite ()*	None	Zn₅(CO₃)₂(OH)₆			6	253488,253489,253490,253494,253498,253507	1066
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃			1	254136	5433
Iron ()*	Iron	Fe			4	253605,253668,254108,254136	1089
Isocubanite ()*	Sphalerite Cubanite	CuFe₂S₃			1	254136	191
Jarosite ()*	Alunite	KFe³⁺₃(SO₄)₂(OH)₆			1	253944	2228
Kaolinite ()*	Clay Kaolinite	Al₂Si₂O₅(OH)₄			14	253518,253622,253684,253687,253843,253954,253986,254006,254064,254125,254220,254266,254294,254302	5591
Kremersite ()*	None	(NH₄)₂Fe³⁺Cl₅·H₂O			1	253944	12
Lonecreekite ()*	Alum	(NH₄)Fe³⁺(SO₄)₂·12H₂O			1	253944	6
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄			1	254006	14899
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂			1	253831	12537
Marcasite ()*	Marcasite	FeS₂	383	359	33	253516,253520,253536,253653,253655,253682,253738,253741,253748,253796,253797,253798,253799,253806,253808,253829,253831,253897,253945,254031,254079,254097,254155,254160,254205,254210,254246,254277,254284,254343,254394,254397,254408	5674
Mascagnite ()*	Arcanite	(NH₄)₂(SO₄)			1	253944	61
Melanterite ()*	Melanterite	Fe(SO₄)·7H₂O	383	359	26	253486,253514,253565,253570,253575,253582,253591,253592,253594,253597,253598,253599,253661,253690,253721,253724,253738,253796,253797,253884,253949,254024,254030,254193,254245,254360	915
Merrillite ()*	Cerite	Ca₉NaMg(PO₄)₇			3	253668,254108,254136	230
Metavoltine ()*	Metavoltine	K₂Na₆Fe²⁺Fe³⁺₆O₂(SO₄)₁₂·18H₂O			1	253944	78
Microcline ()*	Feldspar	K(AlSi₃O₈)			1	254006	4924
Millerite ()*	Millerite	NiS	383	359	2	253797,254259	1066
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂			7	253684,253738,253786,253954,253986,254006,254125	17380
Opal ()*	Amorphous	SiO₂·nH₂O	383	359	2	253792,253797	2994
Orthoclase ()*	Feldspar	K(AlSi₃O₈)			1	254006	2349
Panethite ()*	None	(Na,Ca,K)_1-x(Mg,Fe²⁺,Mn)PO₄			1	254108	3
Pickeringite ()*	Halotrichite	MgAl₂(SO₄)₄·22H₂O	383	359	12	253496,253719,253721,253765,253797,253798,253944,253949,254027,254085,254245,254289	265
Pyracmonite ()*	Pyracmonite	(NH₄)₃Fe(SO₄)₃			1	253944	5
Pyrite ()*	Pyrite	FeS₂	383	359	227	253486,253493,253496,253497,253500,253504,253505,253514,253516,253518,253527,253528,253530,253533,253536,253542,253554,253556,253558,253560,253562,253567,253569,253584,253585,253590,253593,253600,253602,253608,253611,253615,253618,253620,253621,253622,253624,253626,253628,253632,253633,253635,253636,253638,253639,253641,253643,253645,253647,253653,253655,253659,253661,253684,253685,253687,253689,253690,253695,253697,253712,253715,253721,253724,253728,253730,253731,253733,253735,253738,253739,253741,253744,253747,253748,253757,253776,253777,253779,253781,253783,253788,253796,253797,253798,253799,253806,253807,253808,253809,253810,253816,253829,253831,253834,253835,253837,253840,253851,253852,253854,253857,253859,253861,253864,253866,253868,253869,253871,253872,253874,253876,253878,253880,253883,253884,253893,253897,253920,253928,253932,253935,253936,253945,253947,253949,253954,253958,253960,253961,253964,253965,253967,253969,253972,253974,253975,253976,253977,253979,253986,253991,254013,254014,254016,254021,254027,254029,254035,254039,254041,254044,254049,254064,254071,254077,254088,254093,254099,254113,254134,254143,254145,254147,254149,254154,254155,254160,254169,254173,254175,254187,254193,254196,254197,254205,254207,254210,254223,254228,254230,254238,254239,254245,254261,254262,254273,254277,254284,254287,254291,254292,254293,254296,254302,254309,254315,254318,254321,254324,254325,254327,254329,254330,254333,254335,254337,254338,254340,254345,254348,254351,254353,254354,254357,254360,254365,254370,254373,254376,254383,254387,254394,254397,254406,254408,254411	39462
Quartz ()*	Quartz	SiO₂	383	359	53	253496,253505,253608,253653,253684,253697,253700,253758,253766,253770,253772,253776,253788,253796,253797,253798,253826,253829,253888,253891,253897,253898,253900,253901,253902,253903,253907,253909,253916,253941,253945,253947,253949,253954,253986,253996,253999,254000,254001,254006,254012,254093,254124,254125,254131,254187,254191,254200,254242,254245,254266,254316,254354	61156
Rozenite ()*	Starkeyite	Fe²⁺(SO₄)·4H₂O	383	359	5	253661,253797,253949,254024,254360	293
Rutile ()*	Rutile	TiO₂			5	253684,253954,253986,254006,254266	5614
Sabieite ()*	Sabieite	(NH₄)Fe³⁺(SO₄)₂			1	253944	9
Salammoniac ()*	None	(NH₄)Cl			1	253944	105
Schreibersite ()*	None	(Fe,Ni)₃P			2	253668,254108	374
Siderite ()*	Calcite	Fe(CO₃)			5	253541,253609,253684,253954,253986	6417
Smithsonite ()*	Calcite	Zn(CO₃)			6	253488,253489,253490,253494,253498,253507	2473
Sphalerite ()*	Sphalerite	ZnS	931.68	359	113	253488,253489,253490,253491,253494,253498,253506,253507,253510,253516,253518,253520,253523,253527,253528,253533,253568,253608,253653,253655,253658,253661,253682,253687,253715,253766,253770,253772,253779,253788,253831,253838,253843,253844,253851,253857,253861,253886,253889,253891,253893,253897,253909,253913,253923,253924,253926,253929,253945,253947,253949,253960,253961,254014,254035,254044,254049,254063,254064,254067,254071,254079,254093,254100,254108,254140,254154,254155,254160,254161,254173,254187,254210,254211,254220,254223,254225,254228,254230,254232,254242,254255,254259,254261,254262,254273,254277,254279,254284,254287,254292,254293,254302,254309,254315,254323,254324,254329,254340,254348,254351,254353,254354,254383,254387,254392,254394,254397,254400,254406,254408,254411,254416	21482
Strontianite ()*	Aragonite	Sr(CO₃)			11	253653,254044,254079,254253,254261,254277,254279,254394,254406,254408,254411	589
Sulphur ()*	Sulphur	S	931.68	931.68	13	253489,253507,253518,253944,254035,254039,254049,254154,254173,254279,254394,254400,254416	2045
Szomolnokite ()*	Kieserite	Fe(SO₄)·H₂O			2	253645,253661	139
Taenite ()*	None	(Ni,Fe)			4	253605,253668,254108,254136	703
Thénardite ()*	None	Na₂(SO₄)			1	254303	299
Troilite ()*	None	FeS			3	253668,254108,254136	1044
Tschermigite ()*	Alum	(NH₄)Al(SO₄)₂·12H₂O			1	253944	81
Vivianite ()*	Vivianite	Fe²⁺₃(PO₄)₂·8H₂O			6	253651,253847,254081,254110,254367,254368	636
Voltaite ()*	Voltaite	K₂Fe²⁺₅Fe³⁺₃Al(SO₄)₁₂·18H₂O			1	253944	111
Whewellite ()*	Oxalate	Ca(C₂O₄)·H₂O	383	359	3	253797,253807,253945	66
Wurtzite ()*	Wurtzite	ZnS			9	253588,253661,253687,253688,253691,253960,253961,254294,254329	372
Zircon ()*	Zircon	Zr(SiO₄)			5	253684,253954,253986,254006,254266	5251

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Michelle_000573	Concretions bearing whewellite are found in the marine Ohio and Olentangy shales, Ohio. Concretions are described as septarian limestone and often fossiliferous, commonly from one to three feet in diameter. Other minerals within the concretions include fluorescent calcite, dolomite, ankerite, barite, marcasite, quartz and sphalerite. These concretions are found throughout the Devonian Ohio shales.

Age ID

Locality Notes

Michelle_000573

Concretions bearing whewellite are found in the marine Ohio and Olentangy shales, Ohio. Concretions are described as septarian limestone and often fossiliferous, commonly from one to three feet in diameter. Other minerals within the concretions include fluorescent calcite, dolomite, ankerite, barite, marcasite, quartz and sphalerite. These concretions are found throughout the Devonian Ohio shales.

2 Ages assigned to this locality:

	Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Prioritized?	Sample Source	Sample Num	Run Num	Age from other Locality	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
	Michelle_000573	383	359	Upper Devonian		Age of Ohio Shale							Whewellite		266400	Huron Shale Concretions, Huron River, Huron Co., Ohio, USA	Huron Shale Concretions	Hyde and Landy (1966)		AM51_228	Age of concretion bearing Ohio Shale. "...The Huron River cuts through flat-lf ing beds of the marine Ohio and Olentangy shales of Upper Devonian age."
	USGS-Rb-Sr-00375	931.68	931.68	931.68	Rb-Sr	minimum age of metamorphic crystallization		biotite							4053	Stoneco Portage Quarry (Maumee Stone Co. Quarry), Portage, Wood Co., Ohio, USA		USGS-Rb-Sr		USGS-Rb-Sr

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...