F. D. Chester—Stratified Drift in Delaware. 439 
There are two facts which seem to point to the depth of the 
waters in which the stratified drift of northern Delaware was 
deposited. ‘The first of these is the presence of stratified sands 
upon the top of Polly Drummond’s hill, 250 feet above the 
Cretaceous plain. This elevation is well known as the highest 
point in the State, and therefore the highest point at which 
such deposits could have been made. The materials were well- 
washed reddish and yellowish quartzose sand, unassociated with 
pebbles, and the section seen showed the most eminent strati- 
fication running in a horizontal direction. The second fact is 
the occurrence of two hills of unstratified glacial detritus and 
bowlders three miles to the south, called respectively Iron and 
Chestnut Hills (see this Journal, Jan., 1883). These hills are 
no doubt piles of débris dropped from one or more ice-floats 
moving upon the surface of waters which covered the region. 
The highest of these elevations is 227 feet above the level of 
the Cretaceous plain upon which the hills rest. 
_ Upon the very top of the highest elevation, the whole surface 
1s strewn with enormous bowlders of dolerite, a few of which 
measure twenty-five feet in circumference. It is quite evident 
that so large bowlders could have been transported only by 
floating ice-rafts, while their present position upon the very 
summit of one of the hills was probably due to the fact that 
the ice-floats must have been carried upon the surface of water 
which was higher in level than the tops of the hills. But per- 
haps the most conclusive proof of all, in this latter connection, 
regarding the depth of the waters, is the slightly modifying 
action which in places this unstratified drift has undergone, for 
upon the very top in an excellent eutting, I saw in places a 
perfect arrangement of the materials, showing the slight modi- 
fying action of the water over the top of the bill 
shells in this red sand. The total thinning out southward of 
the latter deposit is entirely characteristic of all sea-border 
