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:
Hilton Quarry, Baltimore Co., Maryland, USA

Oldest recorded age at locality: 774.4
Youngest recorded age at locality: 514.6

mindat Locality ID: 142896
mindat URL: http://www.mindat.org/loc-142896.html

Tectonic Settings:

Total number of sublocalities beneath "Hilton Quarry, Baltimore Co., Maryland, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 39°16'60"N
Longitude: 76°40'"W
Decimal Degree (lat, lon): 39.283333333333,-76.666666666667

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.

Calcite	Clay	Clinozoisite	Epidote	Feldspar	Mica	Molybdenite	None	Pyrite	Tourmaline

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 B C Ca Fe H K Mo Na O S Si

Elements from minerals reported directly at this locality: Al B C Ca Fe H K Mo Na O S Si

Structural Groups for minerals in this locality:
Calcite Clay Clinozoisite Epidote Feldspar Mica Molybdenite None Pyrite Tourmaline

8 IMA Minerals at location:

Albite ()*	Epidote ()*	Microcline ()*	Molybdenite ()*	Muscovite ()*
Pyrite ()*	Schorl ()*	Siderite ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Albite ()*	Feldspar	Na(AlSi₃O₈)	774.4	514.6	8803
Epidote ()*	Epidote Clinozoisite	Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)	774.4	514.6	8173
Microcline ()*	Feldspar	K(AlSi₃O₈)	774.4	514.6	4924
Molybdenite ()*	Molybdenite	MoS₂	774.4	514.6	5800
Muscovite ()*	Mica Clay	KAl₂(Si₃Al)O₁₀(OH)₂	774.4	514.6	17380
Pyrite ()*	Pyrite	FeS₂	774.4	514.6	39462
Schorl ()*	Tourmaline	NaFe²⁺₃Al₆(Si₆O₁₈)(BO₃)₃(OH)₃(OH)	774.4	514.6	2705
Siderite ()*	Calcite	Fe(CO₃)	774.4	514.6	6417

7 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Sample Source	Dated Mineral	MinDat Locality ID	Dated Locality (Max Age)	Reference	Reference ID
USGS-U-Th-Pb-00759_206_238	585.8	555.8	570.8±15	206_238	zircon	Zircon	142896	Hilton Quarry, Baltimore Co., Maryland, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-00759_207_206	544.6	514.6	529.6±15	207_206	zircon	Zircon	142896	Hilton Quarry, Baltimore Co., Maryland, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-00759_207_235	577.6	547.6	562.6±15	207_235	zircon	Zircon	142896	Hilton Quarry, Baltimore Co., Maryland, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-00760_206_238	774.4	744.4	759.4±15	206_238	zircon	Zircon	142896	Hilton Quarry, Baltimore Co., Maryland, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-00760_207_206	636.7	606.7	621.7±15	207_206	zircon	Zircon	142896	Hilton Quarry, Baltimore Co., Maryland, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-00760_207_235	740.4	710.4	725.4±15	207_235	zircon	Zircon	142896	Hilton Quarry, Baltimore Co., Maryland, USA	USGS-U-Th-Pb	USGS-U-Th-Pb
USGS-U-Th-Pb-00761_206_238	749.6	719.6	734.6±15	206_238	zircon	Zircon	142896	Hilton Quarry, Baltimore Co., Maryland, USA	USGS-U-Th-Pb	USGS-U-Th-Pb

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...