Full reference: O. C. Marsh. 1884. Principal characters of American Jurassic dinosaurs. Part VII. Diplodocidae, a new family of the Sauropoda. American Journal of Science 27:161-167
Type specimen: YPM 1922, a mandible. Its type locality is Lakes Quarry 5, Morrison (YPM), which is in a Kimmeridgian/Tithonian channel sandstone in the Morrison Formation of Colorado.
Ecology: ground dwelling herbivore