140 0. C. Marsh—Foot-prints in Nevada. 
The supposed human foot-prints are in six series, each with 
alternate right and left tracks. The stride is from two and 
one-half to over three feet in extent. The individual foot- 
prints are from eighteen to twenty inches in length, and about 
eight inches wide. The distance between the line of right 
hand and left hand tracks, or the straddle, is eighteen to nine- 
teen inches. 
he form and general appearance of the supposed human 
tracks is shown in figure 2, which is a reduced copy of one of 
the impressions represented by Dr. W. H. Harkness, 1n his paper 
before the California Academy of Sciences, August 7th, 1882. 
The shaded portion was restored by him from other foot-prints 
of the series. A copy of this impression was given, also, by 
Professor Joseph LeConte, in his paper before the same society, 
August 27th, 1882. 
zon. In support of this view it may be said that the foot- 
prints are almost exactly what these animals would make, if 
the hind feet covered the impressions of those in front. In 
size, in stride, and in width between the right and left series of 
impressions, the foot-prints agree closely with what we should 
expect Mylodon or Morotherium to make. In figure 1, the bones 
of the left hind foot of a species of Mylodon are represented, the 
figure being reduced to the same scale as the accompanying 
cut, figure 2, of one of the supposed human foot-prints. 
e geological horizon of these interesting foot-prints is near 
the junction of the Pliocene and Quaternary. The evidence, 
at present, appears to point to the Equus beds of the upper 
Pliocene as the nearest equivalent. 
supposed human tracks were made by large Hdentates. The 
important fact has recently been determined that some of these 
tracks show impressions of the fore feet. The latter are some- 
what outside of the large foot-prints, as would naturally be the 
case, if the animal changed its course. 
