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U.S. DEPARTMENT OF THE INTERIOR <br /> BRUCE BABBITT, Secretary <br /> US GEOLOGICAL SURVEY <br /> Gordon P Eaton, Director <br /> For additional information write to Copes of this report can be purchased from <br /> District Chief U S Geological Survey <br /> U S Geological Survey Earth Science Information Center <br /> 1608 Mt View Rd Open-File Reports Section <br /> Rapid City, SD 57702 Box 25286, MS 517 <br /> Denver Federal Center Denver, CO 80225-0425 <br /> • <br />