410 



EOLIAN LIMESTONE. 



We find, occasionally, small folds in the limestone, illustrative of the different forms assumed in 

 anticlinals. The common one is too well known to need a special figure. Fig. 261 represented the 

 inverted anticlinal, and Fig. 262 represents a sharp, rather than inverted, anticlinal near Clarendon Springs, 

 near the seat of great disturbances in the strata. It is rather sharper in nature than in the cut. The 

 limestone is thick-bedded, with one layer a foot thick of quartz rock, marked by a dotted line in the figure. 

 The rock in the vicinity dips east. The ledge from which the cut was derived is eighteen feet long and 

 seventeen feet high, almost extending into the carriage road. 



FIG. 2G3. 



Section across the Eolian Limestone in New Haven and Bristol. 



Fig. 263 represents the position of the strata across New Haven, from the red sandrock on the west line 

 of the section, to the village of Bristol, on the east, or to the limit of the limestone in that direction. The 

 east end joins directly upon the west end of Fig. 248, under Quartz Rock. The limestone near Bristol is 

 of a dolomitic character, or else is ferruginous and silicious. It is rather purer near the first ledge of sand- 

 stone and shales about a mile east of New Haven. South of New Haven village the limestone approaches 

 marble in its character, and contains traces of those corals (Stromatopora), that are found more perfect 

 elsewhere. On the west side of the anticlinal, and west of the village of New Haven, the strata are dark 

 colored and much contorted ; also containing layers of silicious matter. The rock is thicker bedded and 

 white near the junction of the limestone and red sandrock. In the east part of Waltham the red sandrock 

 and white limestone are seen in juxtaposition, the nearest approximation to a junction of the two that we 

 have found in the whole State. If the two exposures of red sandrock in Fig. 263 are of the same age, the 

 Eolian limestone would seem to form an inverted anticlinal beneath the red sandrock. 



Range, Extent and Thickness. 



There are two deposits of the Eolian limestones in Vermont. The smaller one is em- 

 braced Avithin the limits of Franklin and Chittenden counties, extending from Milton to 

 Hinesburgh. The principal deposit enters the state at Pownal, extends as far north as 

 New Haven, and then curves arouud a deposit of Georgia slate, reaching southerly to 

 Benson. There are numerous branches of this deposit, varying in number in the different 

 parts of its extent. Tinder the previous head we have classified them into three ranges. 

 We will continue to use this classification, although it is rather artificial. 



The eastern range enters the state at Pownal, unites with the middle range in the north 

 part of Pownal, and may perhaps appear again in Bennington and Shaftsbury interstrati- 

 fied with the quartz. The eastern range in Addison county belongs to the middle range 

 properly, and the east range of the south part of the State is probably not found north of 

 Shaftsbury, unless some of the limestones in the quartz rock in Pittsford and Chittenden 

 belong to it. 



The middle range' enters the State along the valley of Hoosac River in Pownal, and 

 continues, unbroken, constituting the principal part of the deposit, to its termination. 



The west range commences on the latitude of Pownal, in Petersburgh, N. Y. ; enters 

 the State perhaps in the northwest part of Pownal ; is seen on west line of Bennington, 

 in West Shaftsbury, in West Arlington, Sandgate, West Dorset, Danby, Tinmouth ; and in 



