98 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 23, 



arches, 35 feet high, and 34 feet in diameter at the level of the road. 

 Fig. 5 exhibits the beautiful series of arches alluded to. The sym- 

 metry of these arches, the delicacy of the laminae, and the mode in 

 which they end by impinging upon the adjacent stratum, are well 

 worthy of remark. 



Fig. 5. — Sectio7i of arched strata on the side of the road at Lauzon 



Clif. 



Calcareous 

 conglomerate. 



Brown cry- 

 stalline limestone. 



For 50 feet along the descent, below the arches, there is a repe- 

 tition of the set of strata we have grouped above as No. 1 1, and then, 

 to the bottom of the hill, little else but clay-slate with Graptolites. 



Near the foot of this hill-road there is evidence of much disturb- 

 ance in the breaking off from a layer of conglomerate of an angular 

 mass 22 feet long by 6 broad, and its being thi-ust with violence 

 partly into the midst of the adjacent clay-shale, and partly into the 



