In what may be a discovery of national significance, archeologists have found over 100 prehistoric charcoal drawings in western Wisconsin. The pictures on the walls of the three chamber sandstone caves depict birds, deer, geometric shapes and human bowhunters. Some of these types of designs have never been seen before. Archaeologist Ernie Boszhardt, with the Mississippi Valley Archaeology Center at the University of Wisconsin-La Crosse, says it's the most comprehensive rock art collection of any one site on this region: