924 



EXPLORATION GEOPHYSICS 



the left abutment. Evidence of the existence of this so-called preglacial 

 channel had been found by core drilling. Where the channel crossed the 

 axis of the proposed dam, it was about 1,000 feet wide and some 60 feet 



SECTION AATHRU BURIED CHANNEL ALONG PROPOSED AXIS 



O so lOO ISO O 250 600 TSO 



SCALE IN FEET-VERT. SCALE I N FE E T • HORlZ. 



LEGEND 



C^ Oulcrop volcanic osh 

 -^VBuried channel 



Fig. 576. — Cedar Bluff Dam Site, Ellis County, Kansas. (Courtesy Dart 

 Wantland, U. S. Department of the Interior, Bureau of Reclamation.) 



deep in the shale bedrock surface. Bedrock in the channel itself was at a 

 depth of about 110 feet. These features are shown on the location map 

 and cross-section of Figure 576. 



An examination of the core-drill logs from holes drilled along the axis 



