451 : 
The Hon. Mr. Strangways on the 
of its prolongations in other directions beyond the frontier of the 
empire, it may be as well to notice a few instances of similarity 
which exist between some of its members and certain rocks in other 
parts of Russia. 
The red marly clay of the central governments sometimes 
resembles much the variegated portions of the blue clay. I will 
only mention Uryevetz Pavolskoy or Uryetz on the Volga, where 
the marl is streaked with grey, white and blue beds. This variety 
is common along the banks of the Volga, and of the Msta. 
The black slaty clay of Simbirsk and Moscow, containing green 
sand and pyrites in abundance, much resembles that of the copper 
strata of the intermediate bed, but contains numerous organic 
remains and septaria, both unknown in that of the environs of 
Petersburg. From near Simbrisk I have seen specimens of a slaty 
bed, containing fragments of what resemble the broken shells of 
some of the chamite beds, but which are two indistinct for me to 
venture to pronounce them identical. I only mention them, 
therefore, to induce those who may have it in their power to make 
repeated comparisons, without which nothing in geology can even 
approach certainty. In the eastern part of the town of Kineshma 
on the Volga is a sand-pit, the sand of which is a bright yellow 
or white, and of a glassv appearance, like that on the Ishora. 
A globular sandstone, perfectly resembling that described on the 
Tosna, is found on the Msta, a few versts above Borovichy, 
accompanied by a coaly clay, in which there is much pyrites. 
In the neighbourhood of Nishny Novgorod, is found also a globular 
sandstone nearly resembling those of the Msta and Tosna except in 
colour, which in the former is greenish grey, in the two latter, 
