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The Hon. Mr. Strangways on the 
appear on the banks of this river higher up, but I have had no 
opportunity myself of ascertaining whether it does so or not.* 
The limestone hills reappear east of the Volkhof and stretch in 
the same direction, varying a little to the north east, towards the 
south of the lake Onega. The river Sas cuts through them, and its 
picturesque banks claim the particular attention of the geologist. 
The cliffs between Poulnitza and Lzy are a sandy variety of the 
Pleta lime, abounding in organic remains, usually well preserved. 
I found there, during a very cursory examination, a fungite exactly 
resembling those of the Tzarscoe Celo, and Esthonia ; blocks full 
of broken encrinites, &c. resembling those of Sweden, Esthonia, 
the Valday hills, and central Russia; also one remarkable fossil, the 
nature of which I have not been able satisfactorily to determine. 
It resembles a fish’s skin, and is coloured red and white. 
South of the Lake Onega, extends a plain which is described as 
exactly similar to that south of the lake Ladoga. The tract 
between the two lakes is represented as entirely occupied by the 
sand, till towards the north the older rocks appear. On the river 
Megra, occurs a limestone containing madrepores of great beauty, 
which I conceive to be a continuation of the Pleta lime. It is said 
to occur (with trilobites, and accompanied by the black intermediate 
clays) near Vitegra, at the mouth of the river of that name. It 
probably stretches as far as the sides of the Oural chain in the 
governments of Archangel or Vologda; but these as yet are parts 
unknown. 
Of the southern boundary of the limestone tract I have no very 
certain accounts, nor have I been able to investigate it myself. 
On the river Sas it is of no great breadth, and is succeeded on the 
* I have since heard that the limestone is seen in cliffs on the banks of the Volkhof. 
