THE NORTHFIELD SBMISYNCLINE. 215 



111 the Swan section continued east alon<j- the Minot road the fauh and 

 tile contact of the mica-schist (./'), dippiny 80'^ E., with tlie l)asal quaitzite 

 dipping 15° W., can be clearly seen. The latter is here largely a two- 

 niica-gneiss of arenaceous structure, with shining-white nuiscovite. 



In the section opposite School No. 10, where the road branches a little 

 way south of Swan's house, a bed of granite 8 feet thick occupies the place 

 of the fault, and to the east of it is a thick-bedded quartzite, which at top 

 becomes a coarse, white, sandy muscovite-schist with wavy folia and carry- 

 ing garnets. The whole has a thickness of 307 feet, and represents the 

 basal quartzite (ft) and a little of the mica-scliist {<■) above it. It belongs 

 to the eastern flank of the syncline, aiad is brought up by a fault whose 

 throw must be at least equal to the thickness of the strata c to r, or 1,890 

 feet. The western flank of the syncline dips normally K. 30°-35°, while 

 the remnant of the eastern flank is overturned upon the mica-schist and 

 dips easterly against a great dike of ])egniatite. 



SECTIONS NORTH AND SOUTH OF THE OLD WARWICK ROAD. 



The mica-schist (./') continues north as a high ridge which terminates 

 in the prominent hill south of G. Alexander's, called locally Tom Field's 

 hill, whose crest and western slope are underlain by the corrugated schists, 

 while the fault runs along just east of the highest part of the hill. The 

 schists sink down northwardly to the east- west fault which follows closely 

 the line of the old Warwick road, upon which A. Moore's house stands. 



North of this fault the main longitudinal fault is continued north with 

 little or no interruption, passing just ea.st of A. Moore's house, but the 

 whole series of schists, which forms the western half of the anticline and 

 which has been already described, is overturned so that it dips everywhere 

 50°-70^ to the west. This continues to the next road on the north, the 

 present Northfield-Warwick road, and all the members of the series are 

 unchanged except the bed of rusty garnet-hornblende rock at the Minot 

 house, which becomes a persistent and thick bed of hornblende-schist in 

 the upper portion of the whetstone-schist. Another fault cuts oft" the 

 southwest portion of this area, and this part is placed in normal relation to 

 the north end of tlie gneiss area to the southwest, striking east and west, 

 and dipping north away from the gneiss. 



The next transverse fault to the north follows the Northtield- Warwick 



