	In 1937 Dr. Mary Leakey excavated Site I, and she discovered evidence of late Iron Age habitation consisting of a series of rough stone enclosures, and a number of burials. This material according to Sutton belongs to the late Iron Age and is probably around 200 yrs old (Sutton, 1987). During the 1937 excavation, Leakey also discovered a much older occupation layer, dating to the Late Stone Age. Several burials were uncovered; this area is today referred to as the "Neolithic mass grave" on signage at the Museum.