"Donald Ross Prothero (February 21, 1954) is an American paleontologist, geologist, and author who specializes in mammalian paleontology. His research has been in the field of magnetostratigraphy, a technique to date rock layers of the Cenozoic era and its use to date the climate changes which occurred 30-40 million years ago."@en . . . "Prothero, Donald R."@en . "1954-02-21Z"^^ . "1954Z"^^ . "Donald Prothero"@en . "Americanpaleontologist" . . . "1115011" . .