39 
GENERAL RANGE OF SILURIAN ROCKS IN RUSSIA. 
age occur in Podolia, near Kamenetz on the Dniester, and on the banks and tribu- 
taries of that river. 
On the other hand we have already expressed an opinion, derived from personal 
examination, that the oldest palteozoic limestones of Kielce in Poland are of Devo- 
nian age 1 . 
The Silurian rocks which constitute the chief mass of the sedimentary deposits 
ixa the axis of the Ural Mountains will be described in the second part of this 
volume ; and we shall now therefore simply state, that they are there so powerfully 
metamorphosed, dislocated and intermingled with masses of igneous origin, that 
unless we had been previously well acquainted with them in countries where they 
are undisturbed, we never could have unravelled their complicated relations. Even 
there, however, we have been able to decipher, though obscurely, the same order 
from a Lower to an Upper group, as in the regions which have been under con- 
sideration ; the latter (which is charged with a Pentamerus very closely allied to 
the P. Knightii ) being clearly succeeded on the flanks of the chain by a copious 
development of strata charged with Devonian fossils. 
1 After the first chapter was printed off, Mr. Murchison received from M. Ferdinand Oswald, of Oels, 
near Breslau, a communication which shows that true Silurian rocks exist in Silesia, as well as the 
Devonian and Carboniferous strata, which have been there previously recognised (see p. 3*). These 
Silurian strata occur at the villages of Sadewitz and Ober, and Neu Schmollen, south of Oels, where 
they occupy an area of about one and a half German square mile, and are loaded with many characteristic 
Silurian fossils. Among these are the corals Favorites Gothlandica, Catenipora escharoides, and C. laby- 
rinthica, with Or this tesludinaria, O. transversalis, O. Pecten, several Orthoceratites, the Trilobites Calymene 
Blumenbachii, C. macrophthalma, and forms common in Western Europe, with others, such as the lllanus 
crassicauda, Asaphus expansus and Spheeronites, whi h are characteristic of the Cower Silurian rocks of 
Scandinavia and Russia. M. Oswald’s notice will be communicated by Mr. Murchison to the British 
Association for the Advancement of Science, and it is here alone necessary to observe, that, quite alive to 
the necessity of distinguishing these fossil accumulations from the surrounding northern drift, the author 
asserts, that they clearly occur in stratified limestones and shale “ in situ." (See Map, PI. VI.) 
05s.— This chapter was printed and undergoing a last revise, when we received from Professor Eichwald a copy 
of his memoir “ On the Fishes of the Devonian System in the neighbourhood of Pavlosk,” published in a recent 
number (Band 17) of the Bulletin of the Imp. Soc. of Naturalists of Moscow, in which he attributes the discovery 
of these ichthyolites to a young mineralogist, M. Siemaschko. We have no wish whatever to enter here into a 
discussion respecting the collector who may have been the first to find these fossils ; though in stating that, as far 
as we know, Count Keyserling and M. Worth were the first to announce to a scientific Society the presence of 
ichthyolites on the Slavenka, we merely adhere to the truth. Quite independent, however, of all disputes about 
