INDIANA.

(Map [17].)

1. Evansville, Vanderburg County.—So far as the writer knows, remains of extinct horses have been found in Indiana only at the mouth of Pigeon Creek, a short distance below Evansville. Only a single vertebra, a last cervical, was secured. This formed part of a collection made at the place named by Mr. Francis A. Lincke. The collection was described by Dr. Leidy (Proc. Acad. Nat. Sci. Phila., 1854, p. 199). The bone was referred to Equus americanus, a name employed at that time for the horse now known as Equus complicatus. Although it would usually be impossible to identify a species of horse on such materials, it is probable that Leidy was correct. The geological age of the bone-bed is discussed on page [32]. It is concluded that the age is most probably the Sangamon, but possibly Aftonian. The same species has been found at Bigbone Lick, above Louisville, on the Kentucky side. The deposits there overlie the Illinoian drift and are, in part at least, Sangamon.

Associated with the horse bone at Pigeon Creek were megalonyx, a probably extinct bison, the Virginia deer, a tapir, and the extinct wolf Ænocyon dirus.