Mammals from the Oligocene Mammals Small 237×320 Medium 473×640 Large 757×1024 Download Tiff Original 1774×2400 | (473.2 KB) Description Mammals from the Oligocene age. Shown are the Titanothere, Entelodont, Hyracodon, Uintathere, and the Hyaenodou. The six-foot man is drawn to the same scale as the other animals. Keywords age, ancient, Entelodont, Hyaenodou, Hyracodon, mammal, mammals, oligocene, Titanothere, Uintathere Galleries Dinosaurs Source: H. G. Wells The Outline of History (New York, NY: The Macmillan Company, 1921)
