Scientific data near [39.74100,-76.18500]

Search area extends approximately 8.9 km east-west and 11.6 km north-south.

Geographic context

Counties, states, countries, continents, or oceans
Lancaster	county
Pennsylvania	state
United States	country
North America	continent
Land	continent
Map quadrangles, from USGS or Canadian NTS
Conowingo Dam	quadrangle 1:24,000 scale
York	quadrangle 1:100,000 scale
Baltimore	quadrangle 1:250,000 scale
Watershed boundaries (USGS hydrologic units)
Lower Susquehanna	hydrologic unit
Lower Susquehanna	hydrologic accounting unit
Susquehanna	hydrologic subregion
Mid Atlantic	hydrologic region

Geology of US states

Digital geologic maps of the US states with consistent lithology, age, GIS database structure, and format

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Unit	State	Lithology
Baltimore Gabbro Complex	MD	Late Precambrian (?) - Early Paleozoic
Ultramafic Rocks	MD	Early Paleozoic - Late Precambrian (?)
Wissahickon Formation; Boulder Gneiss	MD	Late Precambrian (?)
Wissahickon Formation; Metagraywacke	MD	Late Precambrian (?)
Banded mafic gneiss	PA	Precambrian
Metabasalt	PA	Precambrian
Peach Bottom Slate and Cardiff Conglomerate, undivided	PA	Probably lower Paleozoic
Peters Creek Schist	PA	Probably lower Paleozoic
Ultramafic rocks	PA	Probably lower Paleozoic

Airborne geophysical surveys

Aerial surveys of magnetic anomaly and gamma ray emission; older surveys were analog record which have been digitized, newer surveys collected data in digital form.

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ID	Data type	Description
Pennsylvania-Maryland Tie	M-Dz	Pennsylvania-Maryland Tie 1351 line km with spacing 0.80 km over parts of PA
Maryland Coop '68	M-Dz	Maryland Coop '68 3947 line km with spacing 0.80 km over parts of MD-DE
Harford County	M-Dz	Harford County 2092 line km with spacing 0.80 km over parts of MD
Baltimore	M/R-D	Baltimore 4250 line km with spacing 4.80 km over parts of MD-PA-VA-WV

Estimates of undiscovered mineral resources

National Mineral Resource Assessment 1998: Estimates of the number of undiscovered mineral resources of gold, silver, copper, lead, and zinc within identified permissive tracts (geographic areas in which mineral deposits may form).

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Tract	Deposit Type	Mineralization age
SA20	Low-sulfide Au-quartz vein	Paleozoic

The continental crust

Seventy-seven major components of the North American continent were delineated at a general scale (1:5,000,000); including the general composition, geological environment, and types of primary metals endowments that can be expected in each domain.

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Domain	Crust type	Region
Laurentides	Passive margin	Southeastern Laurentia and Appalachians
Piedmontia	Extensional accretionary orogen	Southeastern Laurentia and Appalachians

National geochemical survey database

National-scale geochemical analysis of stream sediments and soils in the US, from existing data, reanalysis of existing samples, and new sampling. Goal for sample density is one per 289 square km.

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Sample ID	Material	Source
C-210859	Sediment	Stream, Wet
C-298889	Sediment	Stream, Wet
C-299181	Sediment	Soil
C-299213	Sediment	Soil

Geochemistry of stream sediments in the US from the NURE-HSSR database

National-scale geochemical analysis of stream sediments and soils in the US collected and analyzed under the National Uranium Resource Evaluation program.

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Sample ID	Date collected	Sample type
5311364	1978-06-21	Stream sediment sample from flowing stream, sieved to less than 149 microns (-100 mesh) and dried at less than or equal to 110øC.
5312030	1977-11-09	Stream sediment sample from flowing stream, sieved to less than 149 microns (-100 mesh) and dried at less than or equal to 110øC.
5312032	1977-11-09	Stream sediment sample from flowing stream, sieved to less than 149 microns (-100 mesh) and dried at less than or equal to 110øC.
5312033	1977-11-09	Stream sediment sample from flowing stream, sieved to less than 149 microns (-100 mesh) and dried at less than or equal to 110øC.

Geochemistry of water samples in the US from the NURE-HSSR database

National-scale geochemical analysis of water samples in the US collected and analyzed under the National Uranium Resource Evaluation program.

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Sample ID	Date collected	Sample type
1238787	1978-06-21	Stream water sample filtered through a 0.8 micron filter at the site.
1239911	1977-11-09	Stream water sample filtered through a 0.8 micron filter at the site.
1239913	1977-11-09	Stream water sample filtered through a 0.8 micron filter at the site.
1239914	1977-11-09	Stream water sample filtered through a 0.8 micron filter at the site.
1239947	1977-06-08	Well water sample filtered through a 0.8 micron filter at the site.
1239948	1977-06-08	Well water sample filtered through a 0.8 micron filter at the site.
1239949	1977-06-08	Well water sample filtered through a 0.8 micron filter at the site.

Asbestos mines, prospects, and occurrences in the US

Location and mineralogical characteristics of former mines, prospects, and occurrences of asbestos in the continental US. No asbestos producing mines are currently active. Data here are drawn from several previously published reports.

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Deposit name	Deposit type	Location
Conowingo Marble and Mineral Company serpentine quarry	occurrence
Weiant (Wiant) serpentine quarry	occurrence
Line Pit (Lowe's) chromium mine	occurrence
Red Pit mine	occurrence
Gray's quarry	occurrence
Boyce (Spence) mine	occurrence

Podiform chromite deposits

Location and characteristics of 1,124 individual mineral deposits of this type, with grade and tonnage models for chromium as well as several related elements.

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Record	Type	Comment
Red Pit
Line Pit
Jenkins

Mineral Resource Data System

MRDS describes metallic and nonmetallic mineral resources throughout the world. Included are deposit name, location, commodity, deposit description, geologic characteristics, production, reserves, resources, and references.

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Site name	Development	Commodities
Wet Pit Slaymaker Property	Prospect	CR
Riley Sand Chrome Property	Prospect	CR FLD TLC
Slaymaker Chrome Sand Property	Past Producer	CR
West Placer Area	Prospect	CR AL CA FE MG SIL TI
Red Pit Mine	Past Producer	AL CA CR FE MG SIL TI
Marshall Sand Chrome Property	Past Producer	CR
Browns Mine	Past Producer	CR
Preston Farm Pits	Past Producer	CR
Jenkins Corner	Past Producer	FE
Southwest Rock Springs Pits	Past Producer	CR
Line Pit Lowe's Mine	Past Producer	CR
Dawson Quarry	Past Producer	FLD
Line Pit Mine	Past Producer	AL CA CR FE MG SIL TI
Bald Friar Quarry	Past Producer	FLD TLC
Caldwell Quarries	Past Producer	FLD
Worth Brothers Quarry	Past Producer	FLD
Weiant Property	Past Producer	CR FLD STN
Schofield Sand Chrome Deposit	Occurrence	CR FLD TLC
Jenkins Mine	Past Producer	CR
Fulton Twp Mines	Past Producer	FE
Brown Mine	Past Producer	CR
Stubbs Sand-Chrome Property	Prospect	CR
State Line District	Unknown	CR
North Rock Springs Mine	Past Producer	AL CA CR FE MG SIL TI H2O
Damp Pits	Past Producer	CR
Mcvey Quarry	Past Producer	FLD
Conowingo Marble and Mineral Quarry	Past Producer	FLD STN_C
Wet Pit	Past Producer	CR
Cedar Hill Quarry & Mill	Producer	STN_C

An index to PGE-Ni-Cr deposits and occurrences in selected mineral-occurrence databases (web-accessible database)

A compendium of references to previously published databases and database records that describe PGE, nickel, and chromium deposits and occurrences. These data show where to obtain more detailed information about each deposit or occurrence.

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Deposit name	Deposit type	Location
Line Pit Lowe\'s Mine	Past Producer	Maryland, United States
Line Pit Mine	Past Producer	Maryland, United States
Red Pit Mine	Past Producer	Pennsylvania, United States
Marshall Sand Chrome Property	Past Producer	Maryland, United States
Damp Pits	Past Producer	Pennsylvania, United States
Preston Farm Pits	Past Producer	Maryland, United States
Wet Pit	Past Producer	Pennsylvania, United States
North Rock Springs Mine	Past Producer	Pennsylvania, United States
Jenkins Mine	Past Producer	Pennsylvania, United States
Slaymaker Chrome Sand Property	Past Producer	Pennsylvania, United States
Wet Pit Slaymaker Property	Occurrence	Pennsylvania, United States
Riley Sand Chrome Property	Occurrence	Maryland, United States
Stubbs Sand-Chrome Property	Occurrence	Maryland, United States
Schofield Sand Chrome Deposit	Occurrence	Maryland, United States
West Placer Area	Occurrence	Maryland, United States

Active mines and mineral plants in the US

Mine plants and operations for commodities monitored by the National Minerals Information Center of the USGS. Operations included are those considered active in 2003 and surveyed by the USGS.

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Record	Type	Comment
Cedar Hill Quarry
Penn Md Materials

National Geochronological Database

Radiometric ages of geological materials by K-Ar, Rb-Sr, Sm-Nd, fission track, and U-Th-Pb dating methods. A revision of DDS-14 correcting locations and providing the data in more convenient formats.

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Sample ID	Sample source	Rock name
5249	Outcrop or artificial surface exposure	Pegmatite
5250	Outcrop or artificial surface exposure	Granite
5251	Outcrop or artificial surface exposure	Granite
5252	Outcrop or artificial surface exposure	Pegmatite
5253	Outcrop or artificial surface exposure	Hornblendite

National Geochemical Database: Sediment

Geochemical analysis of sediment samples from the National Geochemical Database. Primarily inorganic elemental concentrations, most samples are of stream sediment in the continental US and Alaska.

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Sample ID	Sample source	Sample notes
C210859	natural exposure/outcrop	AEG306 1-30-512 ; NURE resubmittal

Global assessment of undiscovered copper resources

Deposits, prospects, and permissive tracts for porphyry and sediment-hosted copper resources worldwide, with estimates of undiscovered copper resources.

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Tract name	Deposit type	Geology
SA18 - Southern Appalachian Mountains	sediment-hosted stratabound copper	Triassic lacustrine carbonaceous mudstone intervals within sequences of continental sandstone and siltstones of the Newark Supergroup, Culpepper Basin

Prospect- and mine-related features on USGS topographic maps

Symbols indicating mining-related features digitized from historical USGS topographic maps in the western part of the conterminous US. Includes prospect pits, mine shafts and adits, quarries, open-pit mines, tailings piles and ponds, gravel and borrow pit

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Feature ID	Feature type	Feature name
Quarry	point
Open Pit Mine or Quarry	point
Open Pit Mine or Quarry	point
Disturbed Surface	polygon