Mineral Evolution Database

Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.

Mineral locality data provided by mindat.org

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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:
Carroll Co., Maryland, USA

Oldest recorded age at locality: 540
Youngest recorded age at locality: 444

mindat Locality ID: 23903
mindat URL: http://www.mindat.org/loc-23903.html

Tectonic Settings:

Total number of sublocalities beneath "Carroll Co., Maryland, USA": 58
Total number of bottom-level sublocalities: 42

Number of Child Localities: 29
Child Localities:
Avondale
Ebbvale
Harrisville
Henryton
Johnsville
Lehigh Pit
Lineboro
Louisville
Maus Ore Bank
Medford
Meyer Ore Bank
Miller Ore Bank
Monroe Prospect
Neller Ore Bank
New Windsor
Nicodemus Road
North Ebbvale Ore Bank
Oursler Quarry
Oursler Talc Quarries
Peterman Banks
Robert D. Repp Prospect (Portland Cement Company)
Ruby Quarry; Ruby Flint
Schaeffer Ore Banks
Sykesville
Union Bridge
Wareheim Deposit
Weetenkamp Quarry (Tunnel Mine)
West Falls
Westminster

Latitude: 39°32'15"N
Longitude: 76°58'45"W
Decimal Degree (lat, lon): 39.5375,-76.979166666667

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.

Allophane	Amphibole	Beryl	Brochantite	Calcite	Chalcanthite	Chalcopyrite	Clay	Clinozoisite	Copper
Corundum	Covellite	Diaspore	Epidote	Feldspar	Garnet	Malachite	Melanterite	Mica	Molybdenite
None	Not in a structural group	Pyrite	Pyroxene	Quartz	Rocksalt	Scheelite	Sphalerite	Spinel	Stannite
Talc	Tourmaline	Zircon

Actinolite ()*	Albite ()*	Almandine ()*	Arfvedsonite ()*	Augite ()*
Azurite ()*	Beryl ()*	Bornite ()*	Brochantite ()*	Calcite ()*
Carrollite ()*	Chalcanthite ()*	Chalcocite ()*	Chalcopyrite ()*	Chromite ()*
Chrysocolla ()*	Copper ()*	Covellite ()*	Dolomite ()*	Epidote ()*
Gahnite ()*	Galena ()*	Goethite ()*	Gold ()*	Hematite ()*
Hydrozincite ()*	Idaite ()*	Ilmenite ()*	Linnaeite ()*	Magnetite ()*
Malachite ()*	Melanterite ()*	Molybdenite ()*	Muscovite ()*	Pseudomalachite ()*
Pyrite ()*	Quartz ()*	Riebeckite ()*	Schorl ()*	Siderite ()*
Siegenite ()*	Smithsonite ()*	Spessartine ()*	Sphalerite ()*	Spinel ()*
Talc ()*	Tenorite ()*	Todorokite ()*	Tremolite ()*	Violarite ()*
Wulfenite ()*	Zircon ()*	Zoisite ()*

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 B Ba Be C Ca Co Cr Cu Fe H K Mg Mn Mo Na Ni O P Pb S Si Sr Ti Zn Zr

Elements from minerals reported directly at this locality: Cu

Structural Groups for minerals in this locality:
Allophane Amphibole Beryl Brochantite Calcite Chalcanthite Chalcopyrite Clay Clinozoisite Copper
Corundum Covellite Diaspore Epidote Feldspar Garnet Malachite Melanterite Mica Molybdenite
None Not in a structural group Pyrite Pyroxene Quartz Rocksalt Scheelite Sphalerite Spinel Stannite
Talc Tourmaline Zircon

53 IMA Minerals at location:

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
Actinolite ()*	Amphibole	Ca₂(Mg_4.5-2.5Fe²⁺_0.5-2.5)Si₈O₂₂(OH)₂	540	444	3	218613,218633,218641	3419
Albite ()*	Feldspar	Na(AlSi₃O₈)			1	218602	8803
Almandine ()*	Garnet	Fe²⁺₃Al₂(SiO₄)₃			1	218601	2353
Arfvedsonite ()*	Amphibole	NaNa₂(Fe²⁺₄Fe³⁺)Si₈O₂₂(OH)₂	540	444	1	218641	295
Augite ()*	Pyroxene	(Ca,Mg,Fe)₂Si₂O₆			1	218613	2060
Azurite ()*	Not in a structural group	Cu₃(CO₃)₂(OH)₂	540	444	5	218619,218622,218629,218633,218641	5509
Beryl ()*	Beryl	Be₃Al₂Si₆O₁₈			1	218601	4286
Bornite ()*	None	Cu₅FeS₄	540	444	8	218613,218619,218622,218629,218633,218640,218641,218642	5516
Brochantite ()*	Brochantite	Cu₄(SO₄)(OH)₆			1	218613	1633
Calcite ()*	Calcite	Ca(CO₃)	540	444	6	218613,218616,218622,218629,218641,218644	27770
Carrollite ()*	Spinel	CuCo₂S₄	540	444	5	218613,218637,218639,218640,218641	154
Chalcanthite ()*	Chalcanthite	Cu(SO₄)·5H₂O	540	444	3	218613,218633,218641	925
Chalcocite ()*	None	Cu₂S	540	444	5	218613,218622,218629,218637,218641	5707
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	540	444	10	218608,218613,218616,218619,218622,218629,218637,218639,218640,218641	27198
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	540	444	4	218613,218633,218637,218641	3902
Chrysocolla ()*	Allophane	(Cu_2-xAl_x)H_2-xSi₂O₅(OH)₄·nH₂O	540	444	3	218613,218633,218641	3531
Copper ()*	Copper	Cu	540	444	0		3846
Covellite ()*	Covellite	CuS	540	444	4	218613,218622,218637,218641	4165
Dolomite ()*	None	CaMg(CO₃)₂			2	218613,218629	9895
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)	540	444	4	218608,218613,218633,218641	8173
Gahnite ()*	Spinel	ZnAl₂O₄	540	444	3	218613,218637,218641	445
Galena ()*	Rocksalt	PbS			2	218616,218622	24243
Goethite ()*	Diaspore	FeO(OH)	540	444	4	218595,218613,218624,218641	7437
Gold ()*	Copper	Au	540	444	3	218613,218640,218641	30554
Hematite ()*	Corundum	Fe₂O₃	540	444	7	218595,218608,218613,218622,218633,218637,218641	14640
Hydrozincite ()*	None	Zn₅(CO₃)₂(OH)₆			1	218622	1066
Idaite ()*	Stannite Sphalerite	Cu₃FeS₄	540	444	1	218641	142
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃			1	218613	5433
Linnaeite ()*	Spinel	Co²⁺Co³⁺₂S₄	540	444	4	218613,218633,218637,218641	249
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	540	444	11	218608,218613,218616,218619,218633,218637,218639,218640,218641,218642,218648	14899
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂	540	444	9	218613,218616,218619,218622,218629,218633,218641,218642,218644	12537
Melanterite ()*	Melanterite	Fe(SO₄)·7H₂O			1	218613	915
Molybdenite ()*	Molybdenite	MoS₂			1	218630	5800
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂			4	218601,218602,218613,218644	17380
Pseudomalachite ()*	None	Cu₅(PO₄)₂(OH)₄			1	218613	369
Pyrite ()*	Pyrite	FeS₂	540	444	8	218608,218613,218619,218624,218630,218639,218640,218641	39462
Quartz ()*	Quartz	SiO₂	540	444	12	218601,218602,218608,218613,218619,218622,218629,218630,218633,218641,218642,218644	61156
Riebeckite ()*	Amphibole	Na₂(Fe²⁺₃Fe³⁺₂)Si₈O₂₂(OH)₂	540	444	1	218641	375
Schorl ()*	Tourmaline	NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)			1	218602	2705
Siderite ()*	Calcite	Fe(CO₃)	540	444	3	218613,218633,218641	6417
Siegenite ()*	Spinel	CoNi₂S₄	540	444	2	218613,218635	249
Smithsonite ()*	Calcite	Zn(CO₃)			1	218622	2473
Spessartine ()*	Garnet	Mn²⁺₃Al₂(SiO₄)₃			1	218601	1214
Sphalerite ()*	Sphalerite	ZnS	540	444	4	218613,218616,218622,218637	21482
Spinel ()*	Spinel	MgAl₂O₄			1	218613	1934
Talc ()*	Clay Talc	Mg₃Si₄O₁₀(OH)₂	540	444	4	218613,218633,218641,218642	3337
Tenorite ()*	None	CuO			3	218613,218619,218622	1101
Todorokite ()*	None	(Na,Ca,K,Ba,Sr)_1-x(Mn,Mg,Al)₆O₁₂·3-4H₂O			1	218616	433
Tremolite ()*	Amphibole	Ca₂(Mg_5.0-4.5Fe²⁺_0.0-0.5)Si₈O₂₂(OH)₂			1	218613	2562
Violarite ()*	Spinel	FeNi₂S₄	540	444	2	218613,218635	380
Wulfenite ()*	Scheelite	PbMoO₄			1	218644	1655
Zircon ()*	Zircon	Zr(SiO₄)			1	218601	5251
Zoisite ()*	Epidote	Ca₂Al₃[Si₂O₇][SiO₄]O(OH)	540	444	2	218613,218633	1025

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
	Emily000556	540	444	Cambrian-Ordovician											24179	Sykesville, Carroll Co., Maryland, USA	Sykesville	Rast and Horton (1989)	10.1130/SPE228-p1	GSA288_1
	Emily000557	488	470	479±9				zircon				Zircon	Zircon		24179	Sykesville, Carroll Co., Maryland, USA	Sykesville	Horton et al. (2010)	10.1130/2010.1206(25)	GSA206_621

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...