 The first cemeteries were excavated by C. V. Hartman in 1896 and subsequently by Alanson Skinner during the winter of 1916-1917.Hartman excavated a total of 17 graves in four different circular funerary platforms and Skinner also excavated in 4 different cemeteries.Both of these excavations revealed rectangular, box-shaped, stone-lined graves, most of which had cobblestone walls with both a flat limestone floor and roof.