You searched for: Subject Geology Remove constraint Subject: Geology Place United States Remove constraint Place: United States Data type Polygon Remove constraint Data type: Polygon Format Shapefile Remove constraint Format: Shapefile
1994. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This polygon shapefile shows the boundaries of geologic units within the United States. This layer is part of the Geologic Map of the United States... Geological Survey (U.S.).
1974. This datalayer is a polygon coverage representing geologic regions of the conterminous United States. It is a digital version of the geology featur... American Geological Institute.