F. D. Chester— Bowlder Drift in Delaware. 19 
of the Archean rocks of the State. Resting unconformably upon 
these latter are strata of red, white and yellow clays of Creta- 
ceous age, dipping at so low an angle to the southeast, that 
they seem almost horizontal. The position of these clay de- 
posits gives to the country south of Newark a very even topo- 
graphy, hence when we see these two hills of detritus rising 
above the plain they become objects peculiarly conspicuous 
and interesting. 
At the very foot of the hills we find the material a ferrugin- 
ous sand, mixed with quartzose pebbles and fragments of com- 
pact iron-stone. Wherever we can get cuttings in this loose 
characteristic of this cutting, are made up of red and NC 
decomposed materials, derived from the decay of a red ortho- 
hected with these facts is that the rocks whence these loose 
materials came must have been immense in size, aye ak 
humerous, and that they were once scatter ed rene ne 
like the equally large bowlders of ferruginous quartz and iron 
Stone, . 
