THE MOUNT TOBY CONGLOMERATE. 359 



be best studied in the fine roclies moutoiinties in front of the churcli erected 

 recently by ^Ir. 1). L. j\Iood}' and along the Ijrook near by, down a little 

 west to the gristmill. Here the pudding-stone contains pebbles of granite, 

 quartzite, and amphibolite. One block of a flat, barren mica-schist was 2 

 feet long-. The whole series comes from the escarpment of crystalline 

 rocks directly east, and the great fault at the foot of tliis escarpment is 

 about 100 rods east, and that represents the prol)able distance of the shore 

 line. A mile farther south, at the south end of tlie village, tlie conglom- 

 erate contains pebbles of the peculiar coarse hornblende rock that crops 

 out in the lower portion of the escarpment due east, and there only, which 

 indicates that these conglomerates have spread thinly from tlie foot of the 

 scai*}3 less than a mile east, the spreading being due to a gradual transgres- 

 sion of the waters of the Triassic bay. The area just described seems to be 

 now almost isolated by erosion, and from tliis point south to the mouth of 

 Millers River the Connecticut may run wholly on crystalline rocks beneath 

 the Champlain sands, and the narrow shelf between the river and the 

 east-side escarpment of the valley has been stripped, largely, I have no 

 doiibt, by the ice of the shore deposits which once covered it. 



The section at the mouth of Millers River is interesting and peculiar. 

 The farthest bluff visible on the south side of the Connecticut to one stand- 

 ing at the mouth of the tributary is the coarse conglomerate of the Trias. 

 To reach it one passes along the shore over a coarse muscovite-granite, 

 rudely parallel and fissured by pressm-e, and comes at a small brook course 

 upon an outcrop of the Leydeii argillite and quartz-schist, wholly crushed 

 and slickensided. This continues a few rods and is followed to the west by 

 the conglomerate. This is the coarsest shore breccia, wdiolly derived from 

 the adjacent argillite and showing no granitic material. ]\Ian}- blocks are 

 3 feet long; one was measured 43 inches long. The junction is not well 

 exposed, but seems to be nearly vertical, and the whole region is one of 

 mtense crushing and faulting, though there is no indication of great throw. 



The conglomerate is exposed along the river about 25 rods, only a 

 part of its true thickness, and dips 40° N. (strike N. 80° E.) beneath the 

 sandstone, a thin-bedded, gray, slialy rock, which for many rods is crushed 

 into a mass of slickensided pencils. It also for a considerable distance has 

 strike N. 80° E., dip 30° W., and tlien changes suddenly to strike N. 80° 

 W., dip 40° S., and in a little distance one comes on a well-known "liird 

 track" quarry. 



