GLACIAL DRIFT. 243 



Examples of transported boulders of Albany granite are more decisive 

 of a glacial movement down the stream. From the mouth of New Zea- 

 land river nearly to Bethlehem station are numerous blocks of this gran- 

 ite, six feet in length. This rock is in place on the New Zealand river, 

 but not on the Ammonoosuc. Hence the fragments must have moved 

 down the stream (also Little river, in Carroll), and being too large for 

 water transportation, require the agency of a glacier. Rude stride, sup- 

 posed to have been made at this period, occur near the Wing road in the 

 river. The boulders are found as far south as North Lisbon. I obtained 

 a specimen there weighing about eight pounds. No search has been 

 made for them lower down. Their location in the river, and angular 

 shape, indicate transportation by a local glacier. About half a mile 

 above Bethlehem station the valley is almost closed by a large hill of 

 till, with some stratified layers on the outside. This eminence resem- 

 bles a moraine. 



On Little river, about four miles above its mouth, is a slide worthy of 

 mention. For a distance of 50 rods the ledges are bare, where they have 

 been exposed by the sliding, commencing at a point and expanding to 20 

 rods width. At the base of the hill are 10 rods space as long as the 

 width of the slide, full of fallen trees with their trunks mostly arranged 

 in convex order, opposite the direction of transportation. No other feat- 

 ures of local motion were apparent in the Little River valleys, largely 

 because a dense forest prevents them from being seen, or else the power 

 exerted in this slide was not sufificient to score the exposed ledges. It 

 is probable that the Bethlehem and Ammonoosuc glaciers united and 

 flowed down the latter stream several miles below their junction. 



River Moraines. In the Saco valley the tributary streams have 

 brought down immense masses of large boulders that would be called 

 moraines elsewhere. They cross the main valley like terminal moraines. 

 The larger the tributary the more important the deposit. They are par- 

 ticularly conspicuous at the mouths of Bemis and Davis brooks, Nancy 

 and Sawyer's rivers. The latter deposit has been cut through by a rail- 

 road excavation. This is the most conspicuous example. On descend- 

 ing the valley by the carriage-road, we approach a broad expanse of the 

 terrace where are one or two farms, and also the turning off of the branch 

 railroad to Livermore. The highway ascends a sort of terrace, and the 



