, 2 
eee as cl aaa a em 
Notice of Snake Mill and Sardioga Lake, ec. 8 
The plate, marked I. is a full view of the hill with its 
curved strata as they appear from the water; the bac 
ground is the elevated ridge which sepa ¢: 
the Hndson on the east: 
That ‘marked II. is a scott Os hill, oh sie more 
distinctly the cdma eed. A and curve of the” 
different strata. The dark lines may be supposed to rep- 
resent the argillite, and chests of a lig ter ig the gray- 
wacke. 
It is impossible to examine this locality without being 
strongly impressed with the belief that the position which 
the strata here assume could rot have been effected in any 
h up 
* 
the lake fern | 
rp 
= 
seer ul 
fave ate iieving elevated it toa cores extent” it is ‘reed 
into a vertical position, or thrown over upon the unbroken 
stratum behind, by the progressive power of the current. 
If it can be admitted that the operation of such a power 
did produce the effect here represented, it must have ta- 
ken place before the materials, of which the formation is 
composed, had passed into an indurated state, as most of 
the strata remain unbroken, and, where the argillite’ has 
crumbled away, the curved part of the gray-wacke may be 
taken out entire, and some of them, which I now have in 
my possession, exhibit indentations and protu uberances, par- 
ticularly on their curved surfaces, evidently the result of 
friction while in a plastic state. — 
It is likewise pretty oo that the operation was lita 
ited in its extent and t ts effects ceased at the very 
spot where this armas odeaet: as the stratified rocks on © 
the east and west, and likewise to the south, do not appear 
to have suffered any derangement in their general declina- 
tion. On the north and. ; horth-west, the direction from | 
_which the operation of the power, whatever it might have 
—— must have commenced, there are no intervening 
rocks discoverable until we arrive at the Palmertown 
mountains, which are entirely primitive, the er between 
these mountains and the hill being occupied by five or six 
omiles of the lake, andthen a sandy alluvium fe Pr extends 
4% 
“ 
