Metamorphic Upper Devonian Rucks. 369 



prominent ridge overlooking an isolated house (W. Soudin's), 

 and is followed by one more repetition of mica schist, before 

 coming to a fanlt, upon a broad area of feldspathic quartzite 

 — to be described later — which continues to the railroad at the 

 northwest corner of Gill; and if the section is continued 

 across Grass Hill to the Connecticut river, it cuts first a broad 

 continuation of this upper quartzite, followed by a complete 

 repetition of the mica-schist series, with live hornblendic bands, 

 one feldspathic, and the eastern sloping down the hillside 

 from the Moody school buildings to the river, and thus cover- 

 ing a large area. 



Sections carried across the area anywhere from the quartzite 

 base southeastward, give substantially the same succession as 

 that detailed above, only for a distance east of the line there 

 chosen, there is a fault and a repetition of the beds ; so that 

 starting from the same point as the one chosen for the begin- 

 ning of that line, and going directly east, to the saw- mill, on 

 the South Yernon road, nine distinct hornblendic bands are 

 passed, and in almost every case each band is found capped by 

 the whitish schist described above. Also along the State line, 

 and for a distance north and south ; either by the thinning of 

 the beds of mica schist or by the slipping of the hornblendic 

 bands over them, the latter are unusually approximated, the 

 three bands below the middle quartzite coming into close prox- 

 imity to each other, and with the basal quartzite ; it is sepa- 

 rated by a broad mica-schist valley from a prominent horn- 

 blende-rock ridge, just in the east edge of the woods looking 

 down on South Yernon, which is subdivided by only very thin 

 layers of schist. Still farther east, in the large pasture above 

 the South Yernon Hotel, the beds are greatly faulted as indi- 

 cated upon the map. It illustrates the abundant faulting of 

 the region that at the two short railroad cuts in these beds 

 there are in each case two marked faults, bringing quite distant 

 beds into contact. 



Just south of the South Yernon station nearly horizontal 

 mica schist is faulted, on the north, against a dike like mass of 

 hornblende rock, about 10 meters wide ; and on the south, an 

 equally distinct east-west fault-line separates the latter rock 

 from the feldspathic quartzite, also nearly horizontal. 



At the next cutting, three miles farther north, near where 

 the road crosses the railroad, one band of the hornblende rock is 

 pushed over another and the quartzite over both, so that they 

 have a common dip of 25° S. 65° E. ; but the fault planes are 

 distinctly visible, and both the hornblende rock bands are capped 

 by the whitish schist layer which marks their transition into 

 the common mica schist. 



