April 14, 2007 | 12:00 a.m. CDT
Archaeologists survey a site at Rogers Shelter in southern Missouri during a salvage work inspection trip in 1964. From left are Carl Chapman, Wilfred Logan, Henry W. Hamilton and Zorro Bradley. In 1986, Chapman established an 11,000-year timeline for a civilization that lived in the Rogers Shelter area. The discovery is one of the longest cultural sequences found in Missouri.

RELATED STORIES: Ancient history