238 
The Arnerican Geologist, 
April, 1893 
ou. There may, or may not, have been a forest at the time with- 
out affecting the final result, although a longer period must be 
allowed if the forests had to grow after the site was deserted b}- 
Fig. 4. Normal distribution of recent quartz sliop-refuse upon the prairie sur- 
face, the black angular figures representing the refuse. 
the arrow-makers. The immediate result of the uprooting of a 
forest upon such a site is depicted in fig. 5. Portions of the 
quartzes would descend into the pits and portions would be car- 
FiG. 5. The effect of uprooting of trees on surface relics. 
ried up with the roots. When the wood rotted away the 
quartzes would be distributed over the mounds and in the hollows 
somewhat as shown in fig. 6, and b}' the time the elevated por- 
FiG. 6. Distribution of quartzes over humps and in hollows after the rotting of 
uprooted trees. 
tions of the soil had again settled into the general tevel of the 
prairie the conditions would be jDretty much as indicated in fig. 
