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U.S. DEPARTMENT OF THE INTERIOR <br />BRUCE BABBITT, Secretary <br />U.S. GEOLOGICAL SURVEY <br />Gordon P. Eaton, Director <br />The use of trade, product, industry, or firm names is for descriptive purposes only and does not imply <br />endorsement by the U.S. Government. <br />For additional information write to <br />District Chief <br />U.S. Geological Survey <br />Box 25046, MS 415 <br />Denver Federal Center <br />Denver, CO 80225 <br />Copies of this report can be purchased from: <br />U.S. Geological Survey <br />Earth Science Information Center <br />Open -File Reports Section <br />Box 25286, MS 517 <br />Denver Federal Center <br />Denver, CO 80225 <br />