Mammoth construction of the Great Pyramid of ancient Egypt. The earliest known proboscideans, the clade that contains the elephants, existed about 55 million years ago around the Tethys Sea area. The closest relatives of the Proboscidea are the sirenians and the hyraxes. The family Elephantidae is known to have existed six million years ago in Africa, and includes the living elephants and the mammoths. Among many now extinct clades, the mastodon is only a distant relative of the mammoths, and part of the separate Mammutidae family, which diverged 25 million years before the mammoths evolved. The following cladogram shows the placement
Boaz mastodon and Anderson Mills mastodon to the basement of the Dosch farmhouse. Later, Frank Burnham, a Richland Center, Wisconsin, attorney and member of the state legislature, negotiated the sale of the bones to the State of Wisconsin for fifty dollars. The skeleton, which is about two-thirds complete and missing its tusks, was reconstructed in 1915 by M. G. Mehl and G. M. Schwartz and is housed in the Geology Museum of the University of Wisconsin. It is estimated that the Boaz mastodon was eighteen feet long, stood nine and a quarter feet high, and weighed six to eight tons. The arrowhead did not accompany the