 Chetro Ketl's interior walls, particularly those in the eastern wing, were covered in a Type IV veneer characterized by uniform pieces of sandstone with little to no exposed mortar.Judd excluded a fifth type of masonry, called McElmo style, from his typology.In 1934, Florence Hawley used 143 tree-ring dates and a comparative masonry analysis to assemble a construction history of Chetro Ketl in three major periods