GEOLOGY OF THE CONNECTICUT VALLEY DISTRICT. 389 



again upon this section, as their place, between the gneiss of Corey hill 

 and the hornblende schist of Observatory hill, is covered by clay. The 

 section crossing Craft's hill in Lebanon, which is a very important one, 

 has already been described upon page 363, Fig. 59. 



Fig. 60 shows the position of the rocks along Mascomy river, through 

 Lebanon to Enfield village. West Lebanon shows hornblende schist in 

 the Connecticut river. The village is entirely covered by alluvium for a 

 mile back from the mouth of the Mascomy; and then succeed ledges of 

 argillo-mica schist, vertical, strike N. 24° W. Massive hornblende comes 

 next, at the joint crossing of the Mascomy by road and railroad, dijDping 

 42° N. 63° W. The mica schists of Craft's hill are believed to succeed 

 on the east, before coming to the Bethlehem area. Hard sienitic ledges 

 are seen near the scythe factory. These are replaced, near the village of 

 Lebanon, by protogene gneiss. In the south-east part of the village are 

 many ledges of mica schist, dipping 60° S. 40° E. Among them are lay- 

 ers carrying patches of the peculiar variety of fibrous hornblende, called 

 locally "Bentonite." Other ledges are conglomerates, holding distorted 

 pebbles. One of them, consisting of a decomposing feldspathic material, 

 is represented — half the natural size — in another part of this volume. I 

 have in other publications enlarged upon the distortion of pebbles, and 

 their bearing upon the subject of metamorphism, and will not say more, 

 now, than that the shape of this pebble is not a natural one. The upper 

 end of it has been compressed more than the lower, so that it has been 

 drawn out, as if plastic, and somewhat bent. Other ledges in the village 

 show abundant cavities, produced through atmospheric decomposition of 

 limestone patches. On the hill, also, is a nodular vein of quartz, carrying 

 hornblende, sometimes fifteen feet thick. South of the village are ledges 

 thought to dip 75° N. 23° W. Half a mile east of the village a railroad 

 cut develops similar ledges, thought to stand vertically, with the strike 

 N. 53° E. This is somewhat like the gneiss of Mill Village, Hanover. 

 The hills north-east are of mica schist, often considerably ferruginous. 

 Near the mouth of Stony brook, ledges of ferruginous mica schist, with a 

 north-east strike, are visible as one rides past them on the cars. The 

 section crosses next two bands of quartzite, with the intervening argilla- 

 ceous schists. In Enfield the staurolite mica schists are finely developed. 

 The railroad cuts through them near the lake, west of the village, where 



