Therefore, Mammuthus primigenius is the only extinct Proboscidea which consistently provides high quality, carvable ivory.
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Elephant and mammoth tusk ivory comes from the two modified upper incisors of extant and extinct members of the order Proboscidea.
These deposits are known as the Deinotherium Sands, because they often contain teeth and bones from the extinct proboscid Deinotherium.
Sanders, W.J., 2003, chap 10, Proboscidea, in Mikael Fortelius (ed) Geology and paleontology of the Miocene Sinap Formation, Turkey, Columbia University Press, New York