Digital Data

The Pennsylvania Geological Survey maintains databases for water wells, oil and gas wells, coalbed-methane wells, quarries, sinkholes, and earthquake epicenters. We also provide GIS datasets for many geologic maps. Most of the databases and all of the GIS geologic map datasets can be accessed or downloaded from our website.

Our available digital data is explained by topic below. You may also be interested in our Digital Mapping Resources web page, which is a portal to outside sources of digital geologic maps, and images and vector data used in mapping.

Disclaimer: Each user is responsible for the appropriate application of Pennsylvania Geological Survey reports and data as explained in our official disclaimer.

Geologic Maps
Geochemical Analyses
Oil and Gas
Geologic Hazards

Geologic Maps

Many Survey publications include maps that were created using a GIS dataset. Some of these publications have GIS datasets as part of the report, and others include associated GIS datasets with the report download. The reports and their datasets can be accessed from the list of report titles found on each report series page; if GIS data are available in a selected series, it will be noted at the top of the series page. A short description of available GIS datasets for geologic maps follows:

Bedrock Geology of Pennsylvania

Probably the Survey’s most popular dataset, Bedrock Geology of Pennsylvania is a 1:250,000-scale statewide coverage consisting of ArcGIS shapefiles for geologic units, geologic contacts, dikes, and faults. This dataset was created and slightly modified from the source materials used for Map 1, Geologic Map of Pennsylvania.

Atlas Reports

A 135d—ArcGIS feature classes and shapefiles of the data used to create a geologic map (scale 1:24,000) of the Middleburg quadrangle (central Pennsylvania).

A 175b—ArcGIS feature classes and shapefiles of the data used to create a geologic map (scale 1:24,000) and a coal-resource map (scale 1:12,000) of the Conyngham quadrangle (east-central Pennsylvania).

A 189b—ArcInfo coverages (export files) and ArcGIS shapefiles used to create the bedrock geologic map and map of data stations and exposures (both scale 1:24,000) of the Coatesville quadrangle (southeastern Pennsylvania). This report also includes GeoTIFF files of the two maps.

Mineral Resource Reports

M 99, M 100, and M 101—These three coal reports cover the Brandy Camp, Kersey, and Windber quadrangles of the Main Bituminous coal field of western Pennsylvania, respectively. They include GeoTIFFs of 1:24,000-scale coal-resource and geologic maps, as well as ArcInfo coverages (export files) and ArcGIS shapefiles of the geologic units, geologic structure, coal and other key beds, and mined-out areas shown on those maps.

Open-File Reports

All OFBM and OFSM reports—ArcGIS shapefiles and feature classes of data shown on the bedrock and surficial geologic maps found in these two open-file report series, respectively, are available for download with the reports. The maps in most of these reports are 1:24,000 scale.

OF 97–02 and OF 97–03—These reports include georeferenced images of 1:100,000-scale surficial geologic maps of the Wellsboro and Towanda 30- x 60-minute quadrangles, respectively.

OFGG 05–01.0—A georeferenced image of the map Precambrian Basement Map of the Appalachian Basin and Piedmont Province in Pennsylvania (scale 1:500,000) and associated ArcGIS shapefiles are part of the report Basement Depth and Related Geospatial Database for Pennsylvania.

OFGG 11–01.0Folds of PennsylvaniaGIS Data and Map shows Pennsylvania fold axes and structural fronts at 1:500,000 scale. It includes an ArcGIS geodatabase and ArcMap document for viewing the data, as well as ArcGIS shapefiles. Among the attributes are fold names and sources used to compile the named folds.

OFMR 13–01.0Bedrock Geologic Map and Coal-Resource Maps of the Frenchville Quadrangle, Clearfield County, Pennsylvania includes ArcGIS shapefiles and feature classes of the data used to produce the report’s 1:24,000-scale maps.


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Geochemical Analyses

Geochemical Analyses of Selected Lithologies

Open-File Report OFMI 11–01.0, Geochemical Analyses of Selected Lithologies from Geologic Units in Central, North-Central, and Southeastern Pennsylvania, presents geochemical analytical results for 38 rock samples in an Excel spreadsheet. Locations where the samples were collected are indicated in decimal degrees. A rock’s chemistry affects the composition of groundwater and other fluids that move through it, the soils that develop from the rock, and the rock’s industrial and agricultural applications. Chemical composition also provides important constraints on the tectonic setting, the depositional setting, and the source of many rock types.


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Nonfuel-Mineral Resources

Information about companies that extract and sell commodities such as construction aggregate, agricultural lime, and similar materials can be found in Open-File Report OFMR 15–01.0, Directory of Nonfuel-Mineral Producers in Pennsylvania. Included in the compilation are the contact information for each company, the names and locations of their operations, the geologic formations that they are mining, and the products that they sell. The open-file report is a PDF file, but also accessible from the report page is an interactive map that allows the user to zoom to the location of a quarry on their choice of base maps. While exploring the map, one can click on a quarry point to see its pertinent information, or one might choose to extract the data (under “Tools”) and save it to their computer.


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Oil and Gas

Oil and Gas Well Information

The Bureau of Topographic and Geologic Survey is upgrading the software it uses to store and access oil and gas well information for Pennsylvania. The new system is named EDWIN for “Exploration and Development Well Information Network.” It will provide a more user-friendly experience and online access to all available oil and gas well documents and related digital data for Pennsylvania’s 170,000+ wells of record.

Around-the-clock remote access to oil and gas well information is available to subscribing partners. Oil and gas well information can also be obtained by visiting one of the Survey offices or by submitting a service request to our Pittsburgh staff. To learn more about EDWIN, including contact information, visit our Oil and Gas Well Information web page. 

Oil and Gas Fields and Pools

Open-File Report OFOG 15–01.2, Oil and Gas Fields and Pools of Pennsylvania—1859–2011, provides snapshots of Pennsylvania’s oil and gas fields and pools as they existed at the end of 2011. The report includes a PDF text with two page-size map plates showing the locations of pools and fields, respectively, and the related geospatial digital data. The GIS data have reservoir and well-specific attributes obtained from the Pennsylvania Geological Survey’s EDWIN system; they represent early commercial oil production of the mid-1800s through modern shale gas plays of the twenty-first century. Data attributes and limitations are explained in the text and accompanying metadata.

Petroleum Source Rock Geochemistry

Organic-rich, fine-grained source rocks like the Marcellus and Utica shales have become the target of intense exploration and drilling for natural gas in Pennsylvania. Thermogenic shale-gas reservoirs are an exciting unconventional energy resource, one in which the shale serves as source, reservoir, trap, and seal. The relative ability of a source rock to generate oil and gas is dictated by the quantity of organic matter (total organic carbon or TOC), the quality or type of organic matter (hydrogen content), and the thermal maturity of the organic matter in the rock. Data that are a measure of these three parameters are provided in Microsoft Excel spreadsheets for multiple samples from scattered locations across the state.

Marcellus and Utica Shales

Maps showing the extent of the Marcellus shale in Pennsylvania, as well as geologic structure and isopach maps of related formations, and isopach maps of organic-rich shales are available from the Marcellus and Utica Shale Research in Pennsylvania page of our website. The associated GIS line and polygon shapefiles for these maps are also available to download. To see the links to these maps and datasets, select “Maps and Digital Data” under the “Marcellus Shale” heading.

Also on this web page, there is a link to a map showing the distribution of the Utica Shale in Pennsylvania: “Occurrence of the Utica Shale in Pennsylvania” (under the “Utica Shale” heading). The shapefiles used to produce that map are available from the “Line” and “Polygon” links beside the map link.

Coalbed Methane

Coalbed methane (CBM), the natural gas from coal, rivals conventional natural gas in composition and heating value. Historically a mining hazard, CBM is extracted in southwestern Pennsylvania to improve mine safety and for use as an energy source. Production typically occurs in Pennsylvania’s coal-bearing rocks at depths ranging from approximately 300 to 1,800 feet.

Open-File Report OFOG 11–01.0, Pennsylvania Coalbed Methane Wells Database, is a catalog of data on CBM wells, including owner/operator information, production statistics, driller logs, types of geophysical logs, and locations (latitude-longitude locations are given for 229 wells).

Subsurface Rock Correlations

The online publication Subsurface Rock Correlation Diagram, Oil and Gas Producing Regions of Pennsylvania (OFOG 07–01.1) shows subsurface stratigraphic relationships across much of Pennsylvania based on the study of selected geophysical logs. The locations of these type logs, the well owners, the target formations, and the logged intervals are included in a Microsoft Excel spreadsheet with this report. Also included in a ZIP file are images of the logs with formation tops indicated. 

Indiana County Study

Several open-file oil and gas reports resulted from a reconnaissance-level evaluation of the suitability of a site in southwestern Indiana County for geologic carbon dioxide sequestration. Digital data collected as a part of that study are included in the download of the reports.

OFOG 14–01.0 presents information regarding the two-dimensional (2D) seismic-reflection data collected by ARM Geophysics under contract to the Bureau of Topographic and Geologic Survey. This data along with deep well data (OFOG 15–03.0) was used to create a 1:50,000-scale geologic structure map (part of report) on top of the Middle Devonian Onondaga Limestone. The related geodatabase, associated shapefiles, and metadata are included in the ZIP file with the report.

OFOG 14–02.0 and OFOG 15–02.0 contain the raw and processed (respectively) seismic-reflection data along three survey lines in southwestern Indiana County. The raw data are in SEGD format, and the processed data are in SGY format.

OFOG 15–03.0 includes appendices of located well data in an Excel workbook. Appendix A includes basic information on 6,229 shallow and deep wells—including operators, field and pool assignments, well type, and total measured depth. Appendix B includes geologic formation tops interpreted from the 149 deep wells in the county. Data from the deep wells and from seismic-reflection surveys (mentioned above) were used to generate the Onondaga Limestone structure contour map included in OFOG 14–01.0. 


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Pennsylvania Groundwater Information System (PaGWIS)

The preponderance of data in PaGWIS are from water well records submitted to the Pennsylvania Geological Survey by water well drillers. The types of data provided, the accuracy of well locations, and the amount of data entered into PaGWIS have varied over the years. It is estimated that Pennsylvania has over a million domestic water wells plus an unknown number of monitoring and other types of water wells. PaGWIS has records for more than 500,000 water wells and more than 1,600 springs.

PaGWIS data for Pennsylvania may be viewed online or downloaded. Different data packages may be selected by users based on the type of information they desire.  

Aquifer Characteristics of Pennsylvania (W 69)

Water Resource Report 69, Hydrogeologic and Well-Construction Characteristics of the Rocks of Pennsylvania, is a Microsoft Access database that provides a statewide statistical summary of the hydrogeology, groundwater geochemistry, and well-construction characteristics for the stratigraphic units shown on Map 1, Geologic Map of Pennsylvania. The data for the statistical analyses were obtained from PaGWIS (see below). In all, data from almost 50,000 field-located wells and water-quality data for more than 15,000 of those wells were used in the statistical calculations contained in the database. In addition to stratigraphic unit, statistics are further broken down by physiographic section, topographic position, water use, or any combination of those criteria. 

Aquifer Characteristics by Physiographic Section

ArcGIS feature classes and shapefiles of bedrock geologic units and water well locations clipped from the statewide bedrock geologic dataset and PaGWIS (see above), respectively, are available for each of Pennsylvania’s 23 physiographic sections. In addition to geologic units and lithologies, the bedrock polygon features include information on well construction, yield, specific capacity, and water-bearing zones obtained from Water Resource Report 69 (see above). The water well point locations are included to show the general data distribution.

Somerset County Groundwater Resources

Open-File Report 00–02, Groundwater Resources of Somerset County, Pennsylvania, includes Microsoft Excel spreadsheets and comma-separated-value (CSV) text files of well, spring, and water-quality data. Data are provided for 663 wells and 76 springs in Somerset County.


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Geologic Hazards

Earthquake Epicenters

Map 69, Earthquake Catalog and Epicenter Map of Pennsylvania, includes an ArcGIS shapefile and ArcInfo coverage (export file) of earthquake epicenters (437 points) that were recorded in and near Pennsylvania from August 16, 1724, through July 17, 2003. Many of the points represent more than one event. These data are also available to view or download on the Pennsylvania Department of Conservation and Natural Resources interactive geologic map. In addition to the GIS dataset, the Map 69 publication includes a GeoTIFF of the epicenter map and a database of the epicenter information. The earthquake epicenter data include the locations, times and dates, magnitudes, and sources of information for each event.

Sinkhole Data on Interactive Geologic Map

Sinkholes are subsidence features that are commonly found in areas underlain by carbonate bedrock (limestone, dolomite, and marble). Sinkholes can cause significant damage to roadways, buildings, and utilities. By mapping the location of existing sinkholes, we are able to identify areas that are prone to subsidence and sensitive to groundwater contamination. You can learn more about these hazards on the Sinkholes in Pennsylvania page of our website.

Sinkholes and related surface depressions in central and southeastern Pennsylvania were mapped at 1:24,000 scale, and the maps were released in a series of Pennsylvania Geological Survey open-file reports. The central points of these karst features are shown on the Pennsylvania Department of Conservation and Natural Resources interactive geologic map. Associated data can be extracted from that map (through the “Tools” drop-down menu) in a GIS or CAD format.


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