Page Updated: Monday, April 12, 2004 1:28 PM PDT Archaeologist talks about Oregon's early natives Dr. Dennis Jenkins believes the entire Sumner Lake Basin was once filled with water up to state Highway 31. Contributed Photo By Daniel Schreiber, Staff Writer Were humans present 12,000 years ago in the Great Basin region of Oregon when buffalo, non-Spanish horses and even camels roamed the landscape? This, the central question of University of Oregon archaeologist Dennis Jenkins' series of digs, is what researchers have been trying to determine since the 1930s. In 1938, Luther Cressman, the first to explore the region, discovered...