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CLASSIFICATION. 



Section in Mass., 

 Section I, 

 Section II, 

 Section III, 

 Section IV, 

 Section V, 

 Section VI, 

 Section VII, 

 Section VIII, 

 Section IX, 

 Section X, 

 Section Xa, 

 Section XI, 

 Section XII, 

 Section XIII, 



These observations, so far as they belong to the various sections, may be classified as 

 follows : 



Hast Range. Middle Range. West Range. 



Anticlinal, Wanting, All dip east. 



All dip east, Anticlinal, Anticlinal and synclinal. 



Anticlinal, Synclinal (?), Four axes, 



Wanting, Anticlinal, All dip east. 



All dip east, Anticlinal and synclinal, Three axes. 



Anticlinal, Two axes, Anticlinal. 



Wanting, Dip east, All dip east. 



Wanting, Wanting, All dip east. 



Wanting, Wanting, All dip east. 



Wanting, Wanting, Anticlinal. 



Wanting, Wanting, Anticlinal. 



Wanting, Wanting, Anticlinal. 



Wanting, Wanting, Anticlinal. 



Wanting, Wanting, All dip west. 



Wanting, Wanting, All dip east. 



It should be observed, in drawing inferences from this classification, that in some cases 

 in the east range, the observation relates not to the range along Connecticut River, but to 

 a reappearance of the middle range, brought up by an anticlinal, and exhibited by erosion. 

 The general inclination of the Connecticut River range is easterly. 



The western range is the only one which is found upon all the sections. Although the 

 strata all dip east in several instances, it is plain that the range has a fundamental anti- 

 clinal structure. It has been brought to view by the plication of the Green Mountains. 

 Those strata which dip east are probably inverted anticlinals. Two views may be enter- 

 tained respecting the middle range : either it is a repetition of the western range, or a 

 highly metamorphosed portion of the calciferous mica schist. 



Range, Extent and Thickness. 



There may be said to be three ranges of gneiss in Vermont the Green Mountain range, 

 the middle range and the Connecticut River range. The latter is developed in Vermont 

 in only two places, as the clay slate has generally filled out the whole of the State nearest 

 to the river, so that the gneiss is mostly to be found in New Hampshire. The northern 

 extremity of the middle range is divided into two parts or prongs. The Green Mountain 

 range is simple in its form throughout, being very wide at the south line of the State and 

 tapering to a point in Richford. 



GREEN MOUNTAIN RANGE. 



This range is supposed to be the continuation of the gneiss and mica schist of the 

 Hoosac Mountain range and adjacent rocks in Massachusetts. One might be disposed to 

 think, upon placing the Vermont and Massachusetts maps side by side, that one of the 

 maps must be erroneous. Such should notice two things : 1. The mica schist of Hoosac 

 Mountain and the gneiss of the Green Mountains belong to the same formation, and the 



