NYU Spatial Data Repository

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1. Geologic Units (Polygons): Geology of the Conterminous United States, 2005

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.).

2. Global GIS : Geology of the conterminous United States at 1:2,500,000 scale : Geology

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.