GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 369 



observed, many of them showing contortions. Veins of quartz are abun- 

 dant all through this formation in Thetford. Just above Union Village 

 the slates are well developed, most of them vertical, and others nearest 

 the Huronian dipping 80"^ easterly in consequence of an overturn. The 

 Union Village Huronian anticlinal has been the older rock, whose north- 

 westerly pushing has produced this overturn. I have followed the range 

 from the Pompanoosuc to Norwich village, and find it standing vertical 

 for the most part. At G. W. Simmonds's it dips 85° S. 65° E., and it is 

 about the same at E. Johnson's. A valley has been excavated by the 

 east branch of Bloody brook between Meeting-House hill on the east, 

 and an equally lofty eminence to the west. The east edge of the slates 

 is well shown at the crossing of Bloody brook at S. Wright's. It also 

 crops out in the valley of this brook in school-districts Nos. 17 and 11, 

 not extending above school-house No. ii. The hill west of Norwich vil- 

 lage is entirely composed of this same clay slate. The rock shows itself, 

 also, in the valley of the stream descending from school-house No. 2. To 

 reach these last-named localities, the slate bends considerably southerly. 

 In the edge of Hartford, along the valley of a stream, the slate dips 80° 

 N. 80° W. Between this and White River valley no observations have 

 been made. In the last-named region, near Hartford post-ofBce, a rail- 

 road cut exhibits vertical and disturbed slates, and there is a greater 

 breadth of measures. Not far to the west of school-house No. 14, the 

 slates dip 70° N. 70° W., and the country rises. At a bend in the road 

 farther west, the slates dip 70° S. 70° E., thus making a synclinal axis. 

 The slates continue to the foot of a higher range of hills forming the 

 dividing ridge between the Quechee and Connecticut rivers. Along this 

 line, parallel wath White river, the formation is twice as wide as it is far- 

 ther south. It diminishes towards North Hartland. At the south end 

 of this village the slate dips 75° E. If the range follows the adjacent 

 Huronian, it should cross the Connecticut here ; but there are no clay 

 slates of consequence opposite in Plainfield. Hence, for the present, we 

 must believe the formation terminates at North Hartland, and it is so 

 represented upon the map. 



Our studies of this range have been fragmentary; but we seem to have 

 evidence of an anticlinal in Fairlee, an overturn synclinal at Union Vil- 

 lage, a synclinal, with enough measures to supply other axes, in Hartford, 

 VOL. II. 47 



