230 The American (ieolo(jist. October, isho 
It may bu, as Frof. Jjinies 1). Dana has soiiiewlKTc su^j;- 
gested, that some of the boulders lit' l)iiried in the bottom of 
these ponds and marsh lands; but this is ver}' doul)tful, as 
erratics are absent on the higher intervening portions of land, 
at least so far as I have been able to observe. I have been 
over the ground on foot several times, and between Manor and 
Wading River, a distance of six miles, not a single large er- 
ratic was seen. 
The island at this point is nearly fourteen miles in width. 
On leaving Eastport on the south you pass across a plain of 
stratified sand and gravel, covered with brush and stunted 
pines. About two miles this side of Manor, which is halfway 
between Eastport and Wading River, erratic blocks become 
quite plentiful, especially along the railroad track ; and they 
grow larger and more abundant until the Manor station is 
reached. North of this, as you near the Peconic river, the 
boulders begin to disappear again, until the second moraine is 
reached about a mile and a half this side of the village of 
Wading River. The journey is very tiresome, as the road is 
a bed of loose white sand, with liere and there a patch of clay 
and coarse gravel. The valley, however, consists chiefly of 
ponds and jnarshy depressions, as already stated. 
From the terminus of the Port Jeti'erson branch of the Long- 
Island railroad to the sound the hillsides are covered with 
huge boulders, nearly all from the same parent rock as the 
Rock hill erratic. Some of them doubtless contain more cubic 
feet, but none of them are so impressive in appearance. 
It woidd be interesting to know if any of these large boul- 
ders were dropped in the bottom of this part of the sound, 
which is nearly opposite to New Haven, Conn. If none could 
be found, it would show that the boulders must have been dis- 
tributed along certain lines or loops. 
During my visits to Wading River I could detect no trap- 
rock blocks among the boulders: but they are found about 
two miles east of this point, and also on the southern moraine 
east of Rock hill, on the Culverton road. 
The old channels of the Wading river depression unite, and 
seemingly end. with the Peconic river: but during the glacial 
floods the streams must have penetrated the terminal moraine 
at and in the vicinity of Manor. For we find the old channels 
