ON THE GEOLOGY OF RUSSIA IN EITROPE. 
211 
analogy between the fossils of ttie Magnesian and Mountain 
Limestone obtains to a far greater extent than could be supposed 
from any published catalogues. I trusty therefore, that the en- 
suing year will not be mthout its fruits in the production of new 
works on the shells of the ]\Iagnesian Limestone of our own 
country ; and I am glad to have it in my power to inform you, 
that Mr. King, the Curator of the Natui-al History Society of 
Newcastle-on-TjTie, is preparing some excellent materials for this 
purpose. 
A better acquaintance with the Permian fossils, particularly 
the prevalent ]\Iollusca, induces me, notwithstanding the argu- 
ments I employed last year, to infer that this deposit, so natu- 
rally connected through its characteristic fossils with the Carbo- 
niferous strata, must be classed with the Palseozoic rocks*. The 
physical structure of Ptussia is also greatly in favor of this view ; 
for, in large portions of that country, there is an entire absence 
of the great rupture between the Carboniferous rocks and the 
Magnesian Limestone, which is so prevalent in the British Isles. 
The examination of rocks of this age in North America, to which 
I shall hereafter advert, leads to the same opinion ; viz., that the 
Permian deposits must be viewed as the fourth or uppermost 
stage of the Palaeozoic series, notwithstanding the occurrence of 
Thecodont Saurians. 
Jurassic, Cretaceous and Tertiary Strata. — Overlappod as these 
Permian deposits are, in certain tracts of Russia, by red and white 
marls and sands, we are not positively prepared to state (in the 
absence of decisive fossil evidences) whether some of them may 
not represent the Trias ; though the fossiliferous limestone of 
Monte Bogdo, in the steppe of Astrachan, is probably of this 
age. With the Jurassic strata, however, which follow, and which 
occur at intervals from 65° north latitude to the countries south 
of the Crimea, we made ourselves well acquainted. Should the 
* My companions, M. de Verneuil and Count Keyserling, have long enter- 
tained the same views as Mr. Phillips on this point. 
