36 On Bowlders and Rolled Stones. 
er than the bottom of the valley, now is west of this ridge. 
It is composed chiefly of clay slate in a vertical position, and 
it was at top more than one hundred feet across, and twice 
that at bottom. Through this ridge the water and gravel 
had cut a channel nearly one hundred feet deep—f sa 
the water and gravel, for the two sides of the section are 
rounded off in such a manner as to leave no doubt of their 
having been thus worn. But this is not all—as this channel 
was in the act of wearing down, it was constantly deposit- 
ing gravel and sand on the east and opposite side from this 
valley, on which side the ridge of rocks was nearly perpen- 
dicular. This gravel has been spread out so as to be al- 
most a thousand feet wide on the side of the ridge, and 
nearly two hundred high on the eastern side, reaching out’ 
four or five bundred feet from the ledge. The mass is 
very nearly of a semi-circular form, and the eastern side of 
it was deposited in that upright position, which banks of 
- sand, or sand and gravel always assume when deposited in 
still water, thus indicating, like thousands of other similar 
instances, that in those days there was little or no wind to 
this valley, the brook, a small stream, has a channel 
through this slate ridge still deeper, at the same time re- 
moving the grevel also through the centre of the bank 
quite down to the solid rock at bottom. ‘The ruins thus 
removed, have been carried forward and deposited in the 
pond, forming a point of land, or rather gravel, four or five 
hundred feet in extent, when the water was forty feet deep. 
This brook, since the sea flowed up this valley, has not 
only deepened its bed-through the centre of this bank to 
the bottom, but it has also cut itself a channel more than 
one hundred feet deep in a slate ledge. "The appearances 
on the two sides determine with great precision the rela- 
tive effects of water and gravel, and of water alone. When 
they were united, the remaining rocks below those acted by 
water only are all worn or rounded off, the channel is much 
narrower, and the sides are left nearly in a vertical posi- 
tion; although the chasm is one hundred feet deep, the 
rojecting rocks still retain in a great measure their sharp 
edges. Now this great deposit of rounded rocks, gravel 
and sand, must have had their present form given in this 
short valley and as the waters returned, were brought out 
Sr eee a a a Te TT a A ea ETE EE TS MACE CH, A> ce ANE at MEE Ne SNES» SALINE RE OR REN yee. ESS, Se 
Fa at BB ah te Unda fee nc geal ete ae ee 
