GEOLOGY OF THE WHITE MOUNTAIN DISTRICT. 1 55 



occupies all of the principal spur perhaps as far as Chocorua pond. I 

 have not examined the area between the spur and pond as yet, and can- 

 not affirm from observation that these two outcrops are joined together 

 continuously. Specimens of it have come also from Great Hill pond, 

 and one mile from Bcrrv's saw-mill in the north-west part of Tamworth. 

 Toad mountain, about two miles north, is composed of Albany granite. 

 Most likely the upper rock of Mt. Whiteface corresponds with this (p. 

 104), though it is sienitic. Other localities of it are the north peak of 

 Mt. Passaconnaway, the ridge between Sabba Day and Downs brooks and 

 Champney falls in Albany. The principal part of Mt. Passaconnaway is 

 Conway granite. None of the Pemigewasset series of granites have yet 

 been recognized in Sandwich. 



Watcrvillc, etc. Fortunately for our ease in making explorations, there 

 are settlements along Mad river in Waterville. This clearing reaches the 

 interior of the White Mountains, and thus we get glimpses of its structure 

 afforded by no other settlement. As one looks at the amphitheatre of 

 mountains from Greeley's hotel, he should understand that a considera- 

 ble portion of these lofty eminences is composed of the Pemigewasset 

 granites. On the south-west, west, and north nothing else can be seen. 

 Welch, Tecumseh, and Fisher are supposed to be entirely composed of 

 Albany granite. Osceola, at first thought to be the same, seems to be 

 more nearly allied to the Conway. In an extract following, by J. P. Les- 

 ley, mention is made of the interesting apparent bedding in this mountain. 

 North-easterly, the former variety appears at the lower end of the great 

 slide. But on the east. Snow's mountain, and the enormous Sandwich 

 Dome on the south, so far as known, belong to the porphyritic gneiss. 

 I find in the collection specimens of Albany granite from the Mad River 

 notch, or about the Greeley ponds, the east ridge of Osceola, and the 

 ridge between Mad and Swift rivers. The Conway granite occurs at 

 several places on Mad river below Greeley's, at the north end of the 

 north-east ridge of Sandwich Dome, on the east side of Snow's moun- 

 tain, at and above the cascades, on Flume brook a fine-grained variety, 

 on the ridge between Mad and Swift rivers, about a mile above the falls 

 on Sabba Day brook, the falls, and on Downs brook, a mile from Shack- 

 ford's house in Albany. The greater part of Mt. Passaconnaway has the 

 same composition. 



