AMERICAN 
JOURNAL OF SCIENCE AND ARTS. 
[SECOND SERIES.] 
Arr. XV.—A gencral Review of the Geology of Russia; by M. E. 
pe Vernevtt, delivered before the Geological Society of France 
on presenting in the name of Sir R. I. Murcnison, Count A. 
von Kryseriine, and pg Vernevuit, their joint work on the 
_ Geology of Russia.* 
structural geology of the extensive regions of Russia in Eu- 
stitute Russia proper, and the mountains which separate it from 
Siberia. Throughout the vast plains of Russia, except in the 
Donetz country, the most ancient rocks occur in a tender and 
loosely aggregated condition, lying in horizontal beds with hardly 
a trace of upheaval or metamorphism. In the chain of the Ural, on 
the contrary, the paleozoic formations have been subject to the 
most violent dislocations, being variously tilted, folded, and even 
overturned; ‘The limestones are indurated and lose that light 
color for which they are so remarkable in the plains -Argillaceous 
schist and graywacke replace the clays and friable sandstones, 
* Geology of Russia in Europe and the Ural Mountains, 2 vols., 4to. London 
and Paris, 1845: the first volume in En lish, the second in Fre 
This analysis of the work, by M. de erneuil, has been translated for this Jour- 
nail from the Bulletin of the Geological Society of France, by D. D. Owzn, Esq. 
Econp Series, Vol. II, No. 8.—Mareh, 1347. 20 
