Davis.] 
326 
[Nov. i8, 
The great cob- 
ble-field, a mile 
north of Cairo 
(see figure 3) lies 
near the junction 
of two lateral 
tributaries, the 
Shinglekill and 
the Y ondebocker 1 
with the Catskill. 
Its elevation 
above tide- water 
is 280 or 290 
feet. I examined 
only its south- 
eastern border, 
where the num- 
ber of large 
water- worn stones 
strewn over the 
field was truly 
surprising ; they 
are of all sizes up 
to 15 or 18 in- 
ches in diameter ; 
mostly some- 
what flattened, 
but always well 
rounded; sand- 
stones for the 
greater part, but 
o c casionally 
limestones and 
c r y s tallin e s. 
The field stretch- 
ed from side to 
side of the val- 
ley, except where 
cut by the streams 
Fig. 3 
1 Also called “Johndebackus ” by the farmers: the spelling in the text was fur* 
pished by my cordial host, Mr. Walters, of Cairo, 
