KELATIVE POSITION. 



349 



above, has generally been answered in the affirmative. There is little doubt of its stratigraphical relations 

 to the former, as in most of our sections it is seen to overlie the Eolian limestone, or else, as in the deposit 

 running south from Rutland, interstratified with it. Let us present in a tabular form the relations of the 

 quartz rock and gneiss to each other : 



Locality. 

 Massachusetts, 

 Section I, 

 S. W. Woodford, 

 Section II, 

 Section III, 



Section IV, 

 Section V, 

 Section VI, 

 Section VII, 

 Section VIII, 

 Bristol, 

 Starksboro, 



Position of Quartz rock. 



A synclinal trough most of the strata dip east, 

 Probably the same, 

 All that is seen clips east (Fig. 251), 

 All at a small angle, 

 A perfect synclinal basin, 



A synclinal basin, 



Synclinal basin, E . side dip 70 W., W. about 50E., 



Uncertain. Probably both dip east. 



Both dip east, 



Variable, 



A perfect synclinal basin (Fig. 248), 



Position uncertain, 



Position of Gneiss. 

 Granite underlying the quartz. 

 Granite underlying the quartz. 

 Unknown. 

 Perpendicular. 

 Granite veins at junction, gneiss 



near, dips E. 60. 

 Dip west beneath quartz. 

 Perpendicular or high dip to east. 



Overlies quartz. 

 Overlies quartz. 

 Uncertain. 



Both perpendicular at their junc- 

 tion. 



Upon Section III. the quartz rock is slightly disturbed at the junction. The gneiss is highly inclined 

 and appears to underlie the quartz. Fig. 249 shows the particulars. 



Fio. 249. 



G 



Section in Sunderland. 



Explanation of Fig. 249. 

 A Quartz Rock, dip 20 E. 

 B Stream. 



C Quartz rock, N. 45 W., dip 10 W. 

 D Locality of Scolithus linearit (Hall.) 

 E Gncissoid quartz, dipping 15 W. at first, but increasing to 25. 



The land rises rapidly from L to the top of Stratton Mountain. 



Prof. Emmons terminates one of his New York sections at Sunderland, and upon it has represented the 

 quartz rock as nearly horizontal resting upon highly inclined strata of gneiss. See his Taconic System, 

 Albany, 1844, Plate VI, Section L 



FIG. 250. H 



F Granite like that in Stamford. 

 G Quartzose rock, dipping 10 E. 

 H A slide or fault. 

 K Gneiss, N. and S., dip 60 E. 

 L Gneiss, high dip to the west. 



Section in East Dorset and West Peru. 



Explanation of Fig. 250. 



A Eolian limestone at the foot of Mount Eolus. E Micaceous quartz rock, dip 10 E. 



B Western Vermont Railroad Station at East Dorset. P Hyaline quartz rock, horizontal. 

 C Nearly vertical strata of Eolian limestone. G Micaceous quartz rock, dip 20 W. 



D Valley. Rocks obscured by drift and tertiary deposits. H Gneiss, dip 50 W. at Wood & Brown's saw-mill, in Peru- 



