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2. Bedrock Geology: Pennsylvania

2001. Pennsylvania Department of Conservation and Natural Resources. Two digital data sets, one for geologic units and faults and the other for dikes, have been prepared for Pennsylvania. The data sets were digitized...
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3. Ecoregions of Pennsylvania Level III

2010. U S Environmental Protection Agency. Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the typ...
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4. Ecoregions of Pennsylvania Level IV

2010. U S Environmental Protection Agency. Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the typ...
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5. Ecoregions United States (Omernik)

2003. U S Environmental Protection Agency. This map layer shows Omernik's Level III ecoregions, derived from a 1:7,500,000 map created by J.M. Omernik in 1987 and from refinements of Omernik...