GLACIAL DRIFT. 24I 



the end of a road on the dh'ect Hne between the cliff and Bethlehem 

 street. The distance of their transportation is about two miles, and no 

 locality of this rock is known to exist nearer McDonald's than Eagle 

 cliff. Many of these blocks are four feet in length. The ledge near 

 here does not show any ice marks from the local glacier, but there are 

 appearances upon it of the usual south-west movement of the neighbor- 

 hood (page 211). North of McDonald's, towards Gale river, the surface 

 of the drift is smooth and nearly flat. This is to be explained by the 

 passage of the ice over it, as in Bethlehem. Near the western edge of 

 this flat expanse is a moraine running N. 27° W., about 20 feet high 

 and 40 rods long. It is thought to have been connected with this Beth- 

 lehem glacier, as a medial or lateral moraine. The hill slopes rapidly 

 just west of the moraine, and has many quite large boulders scattered 

 over it. 



Between Bethlehem street and Littleton is a Baptist church, near 

 which I observed boulders 15 feet long, 10 wide, and 10 high, whose 

 source is estimated to be from 300 to 500 feet to the south up hill. Their 

 transportation down this slope I ascribe to the same local glacier. 



There are numerous moraines commencing a few rods east of Littleton 

 railroad station, probably put in their present position by ice of this or a 

 related glacier. The eastern slope of the hill between Bethlehem street 

 and station is thickly strewn with large boulders, of material similar to 

 the nearest ledges. Their position is suggestive of transportation down 

 the Ammonoosuc from the east. As similar rocks occur as far as the 

 Twin Mountain house, it is not unlikely that the Ammonoosuc glacier 

 brought them there ; but further study is required to demonstrate the 

 proposition. 



Ammonoos?ic Glacier. We have a few facts in regard to the move- 

 ment of rocks down the Ammonoosuc valley, probably caused by a local 

 glacier. The ice transported boulders far below Bethlehem station, so 

 that abundant proof exists of the existence of a glacier close by the 

 gneissic blocks just mentioned, on the east slope of the Bethlehem hill. 

 The source of this movement was in the large valley occupied by Con- 

 cord granite, between Fabyan's and the Presidential range. Many large 

 blocks of a coarser-grained granite than ordinary lie upon the slope of 

 Mt. Deception, just opposite the Fabyan house, and along the turnpike 



