Hocks and Fossils of FhiWpshyrgh, C. E, 327 



tlie rocks in question were referable to the Levant, or in other words 

 the Medina period. As, however, the chief interest of the discus- 

 sions arising on the occasion had reference to the supposed Taco- 

 nic system of Prof. Emmons, to which Prof. Rogers's observations 

 had been largely directed, his statement of the age of the red rocks 

 and associated limestones excited comparatively little attention at 

 the time, althousrh he believes it was the first distinct announcement 

 of the conclusion regarding the geology of this belt which is now gene- 

 rally received. He however thinks that Prof. Hall mentioned at 

 the time having arrived at a similar result. As this paper was 

 not published in the Transactions of the Association, but only 

 mentioned by its title. Prof. Rogers asked to be allowed to insert 

 in the Proceedings of the Natural History Society an extract set- 

 tino; forth the conclusion and the aro-uments on which it was founded. 

 The extract, beo:inning with an account of the rocks on the eastern 

 slope of the Snake and Buck Mountains, is as follows : — 



" The general geological position of the red rocks here spoken of 

 is clearly seen by following either of the sections from the wes- 

 tern base of the Snake and Buck Mountain across the trough 

 or valley above described. Here we ascend through the various 

 divisions of the Matinal series from the Trenton to the top of the 

 Hudson River group as here defined, each marked by characteristic 

 fossils, and all maintaining a nearly uniform eastern dip ; and above 

 the latter we find a series of red and greenish and grey sandstones 

 and shales of great thickness, succeeded, where the exposures are 

 unbroken, by arenaceous and argillaceous reddish and gray lime- 

 stones, alternating with beds of sandstone similar to that beneath. 



" Stratigraphically considered, this series of beds occupies the 

 position of the Medina group of New York, or its equivalent the 

 Levant series of Pennsylvania and Virginia. The sandstones and 

 shales bear a close resemblance to those of the latter, not only in 

 color, but in the profusion of fucoid-like markings which they display 

 on some of the parting surfaces. The series of reddish and gray 

 limestones which rest upon these massive arenaceous beds form an 

 interesting feature in the geology of Vermont. Their alternation 

 with layers of sandstone and shale, and their frequently reddish 

 tint, would lead us to regard them as a continuation of the lower 

 mass under somewhat new formative conditions. In the prolonga- 

 tion of this belt of sandstones and limestones towards the north, 

 as at Winooski Falls, near Burlins^ton, the latter mass is seen to 

 consist in great part of a pinkish whit€ fine-grained limestone 



