346 The American Geologist. J"''*^- ^^^b 
nearly the whole length of the tunnel with an inclination 
toward the mouth of the excavation of about seven inches 
in the seventy feet. In the upper part of the tunnel the 
homogeneous material shows only slight stratification 
marks — still they are to be seen and are horizontal. I have 
collected many fossils from real aeolian deposits of the 
plains, but never under such conditions as are found here. 
Upon the surface of the hillside above the excavation are 
at present to be found quartzite boulders and pebbles. The 
limestone hills sloping up from the terrace above the exca- 
vation to a height of a hundred and fifty feet have abundant 
evidence of glacial pebbles and boulders. Is it not reason- 
able to suppose that in past times the debris and fragments 
sliding and falling down this hillside would have left evi- 
dence of intercalated material in the mud deposits? There 
are no such evidences in the walls of the tunnel. 
As to the age of the deposits in which the bones were 
found I can ofifer no decided opinion except that they are of 
Pleistocene time, contemporary with the recently extinct 
Equus fauna. Professors Winchell and Upham believe 
them to be of the lowan or earlier stage of the Glacial 
period. They may be correct, but I am not sufficiently 
familiar with glaciological phenomena to vouchsafe an 
opinion. I am only confident that the skeleton dates from 
Pleistocene times — and is old. 
