Geologic Mapping and Resource Evaluation
Licensed Professional Geologists
GMRE, Inc. 925 W. College Ave. State College, PA 16801
Office: (814) 571-7716  |  Email:
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Much of our work is field-based, relying on a solid foundation of traditional geologic methods of mapping, detailed stratigraphy, and structural geology interpretation, supplemented with modern technology such as GPS receivers and GIS-based maps.

Recent GMRE, Inc. projects include:

  • Major projects include detailed bedrock mapping for aggregate quarries in central Pennsylvania, which also involved in-house CAD development of maps and cross-sections to ensure scientific continuity throughout the project. Our mapping was extended to USGS 7.5 minute quadrangles for the Bureau of Topographic and Geologic Survey of Pennsylvania (DCNR State Map program). Thus far we have mapped four quadrangles in the complex Valley and Ridge Province of central Pennsylvania and one more is in progress.

  • Geologic fieldwork, CAD generation of geologic maps, and data interpretation of bedrock suitability for a large water storage tank site at Penn State University. Previous mapping by GMRE, Inc. of the host geologic quadrangle provided crucial information that formed the basis of a comprehensive geological, geophysical, and geotechnical investigation of a complex karstic terrain.

  • Petrographic characterization and evaluation of sedimentary rocks for use as road aggregates. Limestones and dolostones are widely used as aggregate materials in the mid-Atlantic region, but not all such carbonate rocks are appropriate for specific road building projects. Many contain too much argillaceous material (shales), for example, and do not meet DOT aggregate standards. GMRE has provided important petrographic evaluations, commonly in conjunction with field studies in source rock quarries, to help evaluate the suitability of potential road aggregates.

  • Mapping and mineralogical investigations of pyrite-bearing rocks at Skytop, central Pennsylvania, in conjunction with testing and application of Acid-Cure Slurry for Acid Rock Drainage remediation. ARD has long been known in Pennsylvania but only in recent years has it been recognized as a serious problem for roadway construction projects. The exposure of pyrite and other sulfide minerals that causes ARD also represents an environmental hazard to water wells, streams, and building foundations - a problem that must be dealt with appropriately. GMRE geologists specialize in the geological, mineralogical, and geochemical aspects of ARD remediation. Our work begins with careful field studies to understand the nature of the host bedrock and sulfide deposits involved. For example, determining whether the pyrite and other sulfide minerals are syngenetic or epigenetic is crucial for understanding the nature of the problem and predicting the best means for remediation. GMRE provided the primary remedial geological and mineralogical studies at SkyTop, in Centre County, PA. We also have been conducting laboratory and field tests of the Acid-Cure Slurry, a rapidly applied, cost effective treatment designed to encapsulate bedrock exposures and mitigate acidic drainage. The Acid-Cure Slurry has proven to be effective in treating pyrite-bearing roadway cuts.

  • Geologists at GMRE, Inc. are extending their expertise with acid rock drainage remediation beyond the borders of Pennsylvania, too. The construction of Corridor K through the mountains of eastern Tennessee represents a major incursion into pyrite-bearing bedrock, with significant potential environmental impacts. GMRE is providing the geological, geochemical, and engineering experts for review of ARD mitigation procedures and associated environmental plans in the Cherokee National Forest, Tennessee.

  • As a logical extension of our bedrock mapping projects and expertise with pyrite occurrences and ARD, GMRE has conducted petrographic and geochemical investigations of pyrite-bearing black shales of the Marcellus Formation. The Marcellus and Utica (Reedsville) formations continue to be the focus of gas extraction from unconventional geologic sources in Pennsylvania. Detailed bedrock mapping for 7.5' quadrangles has provided us with access to many outcrops of Black Shales. In the process, GMRE has developed an extensive hand-sample inventory and related database for Black Shales from the Marcellus in central and south-central PA. The collection includes other Devonian and Ordovician Black Shales, as well as gray/black shales from the Utica (Reedsville) Fm. and other units of interest.
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