242 SURFACE GEOLOGY. 



for a mile easterly. These have not travelled far, having been derived 

 from the south base of Mt. Deception. One piece is 22 feet long, 14 

 high, and 10 thick. Those 6 feet in length are common. The frag- 

 ments are too far removed from the mountain to have accumulated 

 merely by gravity. A similar moraine is cut by the railroad just below 

 the White Mountain house at the head of the falls in the Ammonoosuc. 



The recent clearings disclose a sharp, conical moraine south of the Mt. 

 Pleasant house, perhaps 20 feet high, and very different in character from 

 the neighboring mounds of esker and river gravel. The many large 

 granite blocks, where the railroad approaches near the Ammonoosuc 

 river, above Mt. Pleasant and near the upper falls, are also like a local 

 moraine. 



In the fields east of the Twin Mountain house there are hundreds of 

 boulders of Mt. Deception granite, often 12 feet in length. The under- 

 lying rocks, for the four or five miles distance between the Twin Moun- 

 tain house and Fabyan's, are of very different material. Hence this is 

 an example of materials transported westerly a distance of four miles. 

 This cannot have been done by water, — the blocks are too large. A 

 local glacier sliding over the more ancient drift must have been the agent 

 of transportation. This lateral moraine east of the Twin Mountain house 

 is quite conspicuous, and the most readily accessible of any examples 

 known. It may be seen from the train, a short distance east of the 

 station. 



Just west of Rounsevel & Colburn's saw-mill, midway between the 

 Twin and White Mountain houses, I found a large block of granite, in 

 1871, nearly 12 feet in diameter, and about square, closely resembling a 

 handsome variety of granite occuring on Mt. Willey, and further south. 

 A second smaller one exists in the neighborhood. I have never found 

 this particular kind of granite north of the Notch in ledges, and as it 

 occurs with the Conway granite near Mt. Willey, it is probable that these 

 blocks descended the New Zealand valley, starting from the west side of 

 the same mountain. Other boulders, seemingly from the south, are a 

 few of Chocorua granite near the Crawford house, in which Prof. Dana 

 discovered grains of chrysolite. I know of no ledge to the north of their 

 present situation from which they could have been derived, while similar 

 ledges abound farther south. 



