704 Vestiges of Glacial Man in Minnesota. (July, 
siderable depth below that surface. In fact, slate rock has been 
encountered a little distance east of the notch at a depth of only 
fourteen feet. It is certain also that exposures of slate veins have 
long since been eaten away by the Mississippi river on the west, 
and it is highly probable that all these once afforded the quartz- 
workers abundant supplies for industrial purposes, A great pro- 
portion of the pieces found here have actually been furnished 
from the quartz-yielding rock of the place. This being the case, 
however, it is still certain that the iinbedded quartzes could not 
have been drifted to their present position by currents of water, 
nor by ice. The facts above cited forbid the possibility of such 
transportation ; and, as shown, it is equally incredible that long 
continued disintegration in the open air should have left upon the 
fragments successively resulting, no trace of weathering nor of 
belonging to different planes of deposit. On the whole, the pre- 
historic record of glacial man at Little Falls, as understood at the 
present stage of investigation, may be briefly summed up # 
follows. 
The quartz-working people flourished at a day when the upper 
division of the terrace-plain had not yet been spread out. As we 
have seen, the basal section of the terrace consists of till coated 
with stone rubbish and covered with a thin layer of soil. It was 
precisely here, upon this old surface, that the quartz-workers lived 
and pursued their pitiful labors. In the fulness of time this van- 
ished folk, perhaps foreseeing the calamity of flood, posed upon 
the earthen floor adjoining their working-place, the quartz 
implements of the stratum. The impending disaster finally ed 
sued ; the movement of the muddy water inhuming these ecg 
was so gentle as not to break up the original arrangement : 
assorted groups, nor yet mar the most delicate edges and points 
of the imbedded pieces. The deposit of quartzes was, at = 
hermetically sealed. Except at the western edge it has 
3 oe h 
remained, quite in statu quo, up to the present time, althoug" 
there has been a constant tendency on the part of na 
cies to erode the drift above, and expose once more to 
the sun the rude remains of this primitive race. fei 
The floods at length abated, the waters of the swollen ao 
sippi wholly subsided ; the river abandoned the terrace-pla n im 
gether, it dug out a new bed for itself at a lower level. ye 
the latter process, or subsequent thereto, the current wash 
the light of 
