Diplotomodon is only known from a single tooth, holotype ANSP 9680, found near Mullica Hill in either the Navesink or Hornerstown Formation, marine deposits dating to the Maastrichtian stage of the late Cretaceous period.
Mullica Hill, New Jersey, a census-designated place located within Harrison Township, Gloucester County
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He was born to Quaker parents George and Lydia Tatum near Mullica Hill, New Jersey in 1822 and moved to Goshen, Ohio in 1831 followed by a move to Cedar County, Iowa in 1844.
A freeway for Route 45 between Interstate 295 in Woodbury and U.S. Route 322 in Mullica Hill was recommended by the Delaware Valley Regional Planning Commission in the 1960s.