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the conclusion that the rocks in question were referable to the 

 Levant, or in other words the Medina period. As, however, the 

 chief interest of the discussions arising on the occasion had refer- 

 ence to the supposed Taconic system of Prof. Emmons, to which 

 Prof. Rogers's observations had been largely directed, his state- 

 ment of the age of the red rocks and associated limestones ex- 

 cited comparatively little attention at the time, although he 

 believes it was the first distinct announcement of the conclusion 

 reo"arding the geology of this belt which is now generally re- 

 ceived. 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 men- 

 tioned by its title, Prof. Rogers asked to be allowed to insert in 

 the Proceedings of the Natural History Society an extract set- 

 ting forth the conclusion and the arguments on which it was 

 founded. The extract, beginning 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 w^estern 

 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 fos- 

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

 the latter we find a series of red and greenish and gray sand- 

 stones and shales of great thickness, succeeded, where the expos- 

 ures are unbroken, by arenaceous and argillaceous reddish and 

 gray limestones, alternating wuth 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 red- 

 dish and gray limestones which rest upon these massive arena- 

 ceous beds form an interesting feature in the geology of Vermont. 

 Their alternation with layers of sandstone and shale, and their 



