ammonites
Hyracodon petersoni Wood 1926 (odd-toed ungulate)

Mammalia - Perissodactyla - Hyracodontidae

Synonym: Hyracodon ischyrolophus Schlaikjer 1935

Belongs to Hyracodon according to D. R. Prothero 1996

Sister taxa: Hyracodon browni, Hyracodon leidyanus, Hyracodon medius, Hyracodon nebraskensis, Hyracodon priscidens

Ecology: ground dwelling browser

Average measurements (in mm): M1 18.4 x 20.4, M2 20.5 x 22.6, M3 16.6 x 22.4, m1 13.8 x 12.1