Prehistoric and modern bison. Above, at the left, is an outline of typical horn cores of 'Bison antiquus' whose bones have been found with Folsom points. Its horns were longer and straighter than those of the buffalo of today, 'Bison bison' shown at the right. Below is a still larger and more ancient type, 'Bison latifrons', with an 88 inch span (McGowan and Hester, 1962, p. 199).