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U.S. DEPARTMENT OF THE INTERIOR

BRUCE BABBITT, Secretary

U.S. GEOLOGICAL SURVEY

ROBERT M. HIRSCH, Acting Director

For additional information 				Copies of this report may
be write to:  						purchased from: 
 							U.S. Geological Survey 
District Chief						Earth Science Information Center 
U.S. Geological 					Survey Open-File Reports Section 
3916 Sunset Ridge					Road Box 26286, Mail Stop 517 
Raleigh, North Carolina 27607 				Denver Federal Center  
							Denver, Colorado 80225