You searched for: Author Beikman, Helen M. Remove constraint Author: Beikman, Helen M. Subject Impact craters Remove constraint Subject: Impact craters Place Massachusetts Remove constraint Place: Massachusetts Place United States Remove constraint Place: United States Place Arkansas Remove constraint Place: Arkansas Data type Line Remove constraint Data type: Line Format Shapefile Remove constraint Format: Shapefile
1. 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.).