232 On the Geography and Geology 



place by insensible shades in the same stratum. It now and then 

 becomes red suddenly for a few square feet, from the presence of 

 iron : then the accidental minerals are few, and of obscure cha- 

 racters. 



This trap at first sight appears unstratified, lining the shore in 

 rugged shelves from 10 to 100 feet high, separated at intervals by 

 sand and shingle beaches, and rising out of the lake in low islands, 

 narrow oblong rocks, and in reefs. It is, however, i^i distinct 

 strata, usually somewhat massive, but often more or less shaly. 

 They almost all go north-north-west, but some, north and north- 

 north-east. They are at least 50 yards broad ; but the breadth 

 is not easily ascertained, from their condition as to weathering, 

 and from the frequent indentures of this tempestous coast only 

 exhibiting small patches of the rock, which are immediately lost 

 in the woods, beaches, or in the lake. They incline westward 

 with a rough, lumpy, surface, often hollowed by the waves into 

 bowls, caves, and small arches. The strata visible for the greatest 

 distance are 2| miles below Point Marmoaze*. One of them is 

 400 yards long. 



In the bay, of which Point Marmoaze is the south-east angle, 

 at that point, and for a short distance below, a dark brown pud- 

 dingstone is conformably interleaved at irregular intervals. Its 

 strata, dipping at an angle of 40°, are equal in size to the amyg- 

 daloid. Near Point Marmoaze, the end of one of these strata is 

 broken into cubic fragments, 8 and 12 feet square, heaped upon 

 each other in a high confused pile. In most instances, this pud- 

 dlngstone is not seen in contact with another rock, but a mile and 

 a half below Point Marmoaze, it is supported on a hard, pale 

 greenish amygdaloid, full of flat masses of green earth, and nodules 

 of quartz, and brown and blue agate. The line of division is 

 abrupt and well marked ; but there is now and then interposed, a 

 fine (coarse in places) reddish-brown sandstone, from 9 to 12 inches 

 thick, studded with two or three rows of pebbles parallel with the 

 stratification : the sandstone close to them being glossy and 



* I was three days near this Point. 



