BERNARDSTON SERIES OF UPPER DEVONIAN. 273 



the quartzite next described. It is true that minute scattered garnets and 

 very small staurolites are found sparingly in the rock in some places in this 

 area, and these seem to have been relied upon by Professor Hitchcock in 

 making the assignment of the rocks to the Coos; liut the same garnets can 

 be found at times in the undoubted argillite in West Mountain, and these 

 and the same minute staurolites occur in the center of the Whately argillite, 

 and both the minerals are very different from their representatives in the 

 Coos group. Both iu macroscopical and microscopical structure the I'ock 

 remains quite constant up to the quartzite, and in its finer grain, its darker 

 color, its excessive contortions, and its abundant and large quartz veins it is 

 well distinguished from the slates of the higlier series. 



The very remarkable projection of the argillite into the basal quartzite 

 in Vernon, in the northwest corner of the Warwick quadrangle, is very 

 clearly made out on the ground and is very interesting. (See map, PI. IV.) 

 It is well exposed on the high, bare hill north of the last house in We.st 

 Northfield (M. Merrill's). The argillite dips everywhere outwardly under 

 the quartzite, and is greatly contorted and crushed and filled with ([uartz 

 veins and combs. 



Tlie basal quartzite and conglomerate. — The 2;)Osition and extent of the 

 basal quartzite gave the first clue to the complex stratigi-aphic arrangement 

 of the series in its eastward continuation. Beginning at the point already 

 described (page 27'2), opposite the Williams farm and east of the road to 

 East Mountain (back of "Mrs. Haley's" on the old atlas map), with a strike 

 due east, it has bent round to N. G5° E. before it goes under the massive 

 di-umlin which lies east of the river, and on its emergence it is abundantly 

 exposed with the same strike along the southern of the two northwest roads 

 mentioned above, west of Dry Brook, especially south of A. G. Chapin's 

 house. Taking the direction of this road across the valley of Dry Brook, 

 it can be followed readily, with the same strike and low southeast dip, and 

 physically unchanged, through the chestnut woods northwest of the end of 

 Purple's blind road, east of Dry Brook. It crosses the first north-south 

 road in Northfield at a point wliere a loop of the brook is cut by the road, 

 and gradually bearing round to the north it passes the State line with a 

 strike N. 10° W. It then makes a great sweep to the east, turns sharply 

 on itself, goes south across the State line for a little way, and then swings 

 round to the north at the foot of the high ground and continues northerly. 



MON XXIX 18 



