NYU Spatial Data Repository

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11. Outlines of Major Calderas and Impact Structures: Generalized Geologic Map of the Conterminous United States, 2005

2005. King, Philip B., Arndt, Raymond E., Schruben, Paul G., Bawiec, Walter J., and Beikman, Helen M. This line shapefile shows the outlines of major calderas and impact structures in the United States. A caldera is a large, generally circular depre... Geological Survey (U.S.).

12. Railroads of the United States, 2005

2005. Geological Survey (U.S.). This line shapefile represents railroads in the conterminous United States and Alaska at 1:2,000,000. This is a replacement for the December 1998 m... Geological Survey (U.S.).