From Ohio History Central
Bison fossil skull measuring 23" from horn tip to horn tip and 12" high. This Bison fossil skull was found in a Peat Bog in Northern Minnesota.
One specimen of the giant-horned bison, Bison latifrons, is known from southwestern Ohio. The horns of this specimen measure about six feet from tip to tip. Specimens of modern bison, Bison bison, have been reported from presumed Pleistocene deposits.
- Hansen, M. C., 1996. "Phylum Chordata--Vertebrate Fossils," in Fossils of Ohio, edited by R. M. Feldmann and Merrianne Hackathorn. Ohio Division of Geological Survey Bulletin 70, p. 288-369.