EANGE AND EXTENT. 415 



Middlebury. But it is sufficient for our purpose to say that most of the town is under- 

 laid by Eolian limestone. 



In New Haven and Bristol this rock is divided in the middle by a range of sandstones 

 and shales, joining the red sandrock in Monkton. See Fig. 263, which gives a section 

 through these two towns. ' East of C. Wright's house, and west of the Rutland and Bur- 

 lington Railroad, there is limestone of good quality. In Weybridge it is more or less 

 developed. Clay slate is abundant in it in the south part of the town ; and as it is north 

 of similar ledges in Cornwall, it may belong to the same range with them. 



There is an arm of Eolian limestone running down to Benson, and perhaps to Fair- 

 haven, west of the Georgia slate, from Weybridge. In the southwest part of Weybridge 

 the rock is a gray, silicious, thick-bedded limestone, resembling the upper limestone of 

 the Hudson River group at Snake Mountain. There is sparry limestone at Cornwall 

 Center, and in the west part of the town. The quarry from which the stone was obtained 

 for the building of Middlebury College is in this town, and obscure fossils are found in it 

 resembling fragments of crinoids. This arm of limestone is the principal source of the 

 fossils which have been of service to us in conjecturing the age of the limestone. 



It is sufficient to say respecting the occurrence (except Section VII.) of the limestone 

 in this region, that in the northwest part of Whiting, the east part of Shoreham, the west 

 part of Sudbury, that it has the usual characteristics of the group, and that the peculiar 

 configuration of the deposit may be seen on the map. Passing south in Hubbardton, 

 Benson, Castleton, and Fairhaven, we cross over a great many alternations of limestone 

 and clay slate, so numerous that we thought it unadvisable to specify the peculiar locali- 

 ties and number, deeming the general statement sufficient. In Fairhaven this limestone 

 is sometimes sparry -otherwise it is of a bluish or grayish, compact, thick-bedded mass 

 of limestone. 



From Bristol, as we return to the point we once reached in our northern course, a 

 valley runs north between Hog Back Mountain on the east, and the hills of Monkton on 

 the west, along a branch of Lewis Creek. Though very narrow in some places, it is barely 

 possible that the limestone may extend along this valley and connect the two deposits of 

 Eolian limestone. Near the north line of Adclison County the limestone of the northern 

 deposit appears in several large ledges of a rather ferruginous impure limestone, probably 

 magncsian. As such it is found for two or three miles upon the east side of the semi- 

 vitreous quartz rock into Starksboro ; and there is another belt of limestone in the quartz 

 rock in Starksboro and Bristol, parallel to the west border of the quartz rock. Part of its 

 course is along the north branch of the New Haven River, in Bristol. 



In Hinesburgh an impure limestone may be traced from the south line through the 

 town beyond the route of Section X. At the village it leaves its north course and turns 

 northwesterly, at the same time expanding greatly, so that in Shelburne it is as wide as 

 in the south part of New Haven. Probably one or two strips of limestone run across the 

 sandstone group through Monkton, and connect the northern and southern Eolian deposits. 

 From the position of these rocks upon the map, one would infer that the red sandstone 

 covers the limestone, as its height is greater, and especially as at Baptist Corner in Char- 

 lotto, there is such an abundance of a white tolerably pure limestone, passing beneath the 

 sandstone unconformably. It would not surprise us to learn that the two Eolian deposits 



