A partial cranium belonging to the extinct woodland musk-ox, Symbos cavifrons, is reported from the headwaters of Oak Creek, Delta County, Colorado. This is the first cranium of the genus Symbos to be described from the Colorado Plateau, and it helps to define the southwest boundary of the known range of the genus.
McDonald, Jerry N.
"Symbos cavifrons (Artiodactyla: Bovidae) from Delta County, Colorado,"
Great Basin Naturalist: Vol. 45
, Article 8.
Available at: http://scholarsarchive.byu.edu/gbn/vol45/iss3/8