* 
ne, ie 
of North America with those of Europe. 183 
“ Table of the groups which compose the Paleozoic Sormations 
in the states of Ohio, Kentucky and Indiana.’* 
8. Sandstones, shales and limestones of 
C coal. 
Poo nusrous system, 7. Carboniferous limestone. 
6. Fine grained, micaceous sandstone. 
ist 
5. Black, bituminous schists. 
Devonian system, 4. Shelly limestone, and upper coralline 
limestone. 
Silurian system, 3. Siliceous or magnesian limestone, 
(superior, ) (cliff limestone. ) 
Silurian system, 2. Blue limestones and mazrls. 
(inferior, ) 1. Compact limestone. 
The character of these formations in detail is already known to 
most readers of this Journal through the Reports on the Geclogy 
of the different States, and from the Review of the N. Y. Geol. 
Reports and comparison of Western formations, by D. D. Owen. 
M. de Verneuil concludes his descriptions of these rocks by 
some observations upon the simple geological structure of the 
Western States as compared to New York. All the schistose and 
arenaceous deposits below the carboniferous period have disappear- 
ed almost entirely, even the extensive and important groups of 
Hudson River, Hamilton and Chemung are scarcely recognized 
in their western extension, and the old red sandstone is entirely 
wanting. On the other hand, the principal calcareous formatious 
have augmented their thickness and importance. These schistose 
formations being influenced by the proximity of shores and cur- 
rents, are less reliable than calcareous formations in studying the 
Succession of strata. For these reasons, M. de Verneuil remarks, 
* «Tt is to Messrs. R. Dale Owen, Mather, Locke, Hildreth and Foster, that we 
Owe our knowledge of the geological constitution of these States.” 
