Maryland Department of Natural Resources


Quadrangle Geologic Maps

Information about Our Digital Quadrangle Geologic Map Series ( index map is available at the bottom of this page ).

Thumbnail of South River-Annapolis Quadrangle

MGS is developing digital geologic maps, particularly for use in geographic information systems (GIS). These maps are available for purchase on CD-ROM, and printed versions are available separately. Print versions are full-color, full-scale paper plots at a resolution of 300 dpi (generally about 34 x 44 inches in size). To purchase copies of maps (paper or CD-ROM) contact the Publications Office with the Version number and Title from the chart below. If you are interested in our traditional paper map products see the Maps section of the online List of Publications for ordering information and prices.

All maps and geospatial data are projected in the Maryland State Plane coordinate system (Lambert conformal conic projection) North American Datum 1983 (NAD83) meters.  The geologic information for the quadrangle maps is compiled at a scale of 1:24,000 (1 inch equals 2,000 feet). The base maps for this series were developed from U.S. Geological Survey topographic 7.5-minute quadrangle maps (1:24,000 scale). Contour intervals are in feet.

The CDs contain a copy of the pertinent map(s) in Adobe Acrobat PDF format. If you have access to a large-format color printer you could print these maps at full scale from the PDF file. The CDs also contain files for use in GIS. The GIS files were created using software (version 8.2 or higher). ArcGIS coverages as well as interchange files (.e00) are provided for the vector layers, which include the geologic layers and some or all of the base map layers. Some maps contain raster images for some base map components; rasters are in TIFF format. The full written descriptions of the geologic units are provided in a text file format in addition to being on the PDF. Text files can be read by any text reader (such as Notepad, Wordpad, or Microsoft Word). Metadata files (information about the map and how the layers were made) are provided as part of the digital layers and as separate text files.

Information about ESRI’s ArcExplorer software is provided on the CD but must be downloaded separately. ArcExplorer is ESRI's free GIS data reader software (for use with coverages, shapefiles, images). Visit the ESRI website at to download the software or get more information about this program.

Older quadrangles are commonly available only as image files (JPEG) scanned from paper maps.

    Quadrangle Topic Author(s) Topo
Formats Version Release
pdf Map jpg Map Printed Map gis Map data CD-ROM
Accident Geologic Brezinski, D.K., 2015 A2 pdf Map --- --- --- --- ACCID2015.OF 06/15
Avilton and Frostburg Geologic Brezinski, D.K., 1988 A4 & A5 --- jpg Map $11.00 --- --- AVILT_FROST_1988_GEO 12/88
Baltimore East Geologic Reinhardt, J., & Crowley, W.P, 1979 D24 --- jpg Map --- --- --- BALTE_1979_GEO 12/79
Baltimore West Geologic Crowley, W.P. & Reinhardt, J., 1979 D23 --- jpg Map $9.00 --- --- BALTW_1979_GEO 12/79
Benedict Geologic Glaser, J.D., 1999 J23 pdf Map --- $9.00 gis Map data $25.00 BENED2002.1 12/02
Bowie Geologic Glaser, J.D., 1973 G23 --- jpg Map --- --- --- BOWIE_1973_GEO 12/73
Bristol Geologic Glaser, J.D., 1984 H23 --- jpg Map $9.00 --- --- BRIST_1984_GEO 12/84
Broomes Island Geologic Glaser, J.D., 2003 K24 pdf Map --- $9.00 gis Map data $25.00 BROOM2003.1 09/03
Geologic and karst features included on one CD-ROM.  Geologic and karst printed maps only available separately.
Geologic Brezinski, D.K. & Southworth, S., 2001 D17 pdf Map --- $9.00 gis Map data $25.00 BUCKEGEO2001.2 06/04
Karst Brezinski, D.K., 2001 pdf Map --- $9.00 BUCKEKST2001.2 06/04
Catoctin Furnace
Geologic and karst features included on one CD-ROM.  Geologic and karst printed maps only available separately.
Geologic Brezinski, D.K., 2004 B17 pdf Map --- $9.00 gis Map data $25.00 CATOCGEO2004.1 06/04
Karst Brezinski, D.K., 2004 pdf Map --- $9.00 CATOCKST2004.1 06/04
Catoctin Furnace and Blue Ridge Summit (1977) Geologic Fauth, J.L., 1977 B17 pdf Map jpg Map $9.00 --- --- --- 1977
Clear Spring and Hedgesville
Geologic and karst features combined on one map.  Data and PDF map available for download.  We do not offer this map as a print or on disc.
Geologic and karst Brezinski, D. K., & Glaser, J.D., 2014 A13 pdf Map --- --- gis Map data --- CL_HE2014 07/14
Cockeysville Geologic Crowley, W.P., Reinhardt, J., & Cleaves, E.T., 1975 C23 --- jpg Map $9.00 --- --- COCKE_1975_GEO 12/75
Cove Point Geologic Glaser, J.D., 2003 K25 pdf Map