434 
The Hon. Mr. Strangways on the 
denudations, and the numerous combes and vallies now destitute of 
water, along the edges of all the escarpments. Such examples 
occur every where ; but they are more easily remarked in secondary 
than in primitive countries, owing to the greater softness of the 
materials. 
The blue clay is never sufficiently solid to admit of being rolled 
into pebbles. 
The intermediate bed occurs rolled but seldom ; never on the 
Carelian side of the Neva : on the Ingrian side are found sometimes 
small rolled fragments of the sandstone which is in situ between 
Peterhof and Oranienbaum, but in no great quantity. 
One of the most remarkable circumstances respecting the boulders 
of this stratum, is that rolled pieces of the smaller grained chamite 
beds are found on the summit of a steep ridge forming the extreme 
point eastward of the heights of Shulcova. They lie principally 
on the western brow of the hill, where it overhangs a deep ravine 
filled with an impassable and mossy bog, and looking towards 
Doudorof. The great elevation of this ridge, which apparently 
yields only to Doudorof and Teply Sad in height ; the geographical 
distance from the nearest point where the chamite bed appears in 
situ , which is at the Slavenca quarry, or possibly on the Coshelevca;* 
and the great thickness of the limestone in that part of the district, 
make it a question of no easy solution, how rolled fragments of a 
rock three hundred feet or more below that on which they are 
found lying, could ever have arrived at their present situation. 
* I have been told it exists there in situ ; but I never could distinguish it myself, 
otherwise than in rolled pieces. This stream is overgrown, and almost buried in tangled 
brushwood, which renders the examination of a small protrusion of the intermediate 
bed through which it cuts, not only difficult of access, but unsatisfactory where accessible. 
See the conclusion of Mr. Weaver’s paper, Geological Trans, vol. 5. 
