464 C. H. HITCHCOCK — AMMONOOSUC DISTRICT, NEW HAMPSHIRE 



crystals. Sections across specimens of sandstone from Fitch hill show 

 the secondary enlargement very much like that described from Wis- 

 consin and elsewhere.* It is also conceivable that a part of what is 

 termed " induration " may be the result of the deposition or interpene- 

 tration of strata by amorphous silica. 



There seem to be two ranges of this sandy rock, coming near together 

 on Manns hill, in the north part of Littleton, and diverging so as to 

 appear on both sides of the Blueberry Mountain range, where they are 

 disposed in a synclinal attitude. They are both represented in figure 1 

 of plate 42. This section extends from the village cemetery in Littleton 

 along the Waterford road, past Fitch's house. At the east end the rock 

 is a granite overlaid by the quartzite (ss), and then by the limestone 

 before coming to Parker brook. A few fossils have been found in the 

 limestone on both sides of the brook. After passing diorite the sand- 

 stone is again in evidence, both outcrops dipping westerly. The granite 

 (protogene) crops out to the west of the sandstone, and also more abun- 

 dantly near Fitch's house. Crinoidal stems have been found in thin 

 bands of limestone in a slate quite near a fork in the road, and the rock 

 is supposed to be a continuation down the hill from the fine exposures 

 of fossiliferous strata represented in figure 2, plate 42. 



The best fossil locality is near the residence of Mr Frank Fitch, about 

 2 miles west of the Littleton railroad station. The section through it, 

 figure 2, suggests that the age of the coralline layers (1) is greater than 

 that of the trilobite slate (2), while above them both are two other dis- 

 tinct bands of limestone — one quite pure calcium carbonate (3) and the 

 other magnesian (4), neither of which contains fossils. The trilobite 

 slate is calcareous and distinct from the argillite. The total thickness 

 of these members must be from 200 to 300 feet. Above the limestones 

 is a band of coarse sandstones (5), perhaps 25 feet thick. Hawes called 

 it a " half fragmental quartz schist." As it contains both well rounded 

 pebbles and enlarged mineral fragments, the term is not inappropriate. 

 It is believed to be the equivalent of the sandstone, quartzite, or buhr- 

 stone previously mentioned. Still above the sandstone is a thick mass 

 of argillite (6). On Fitch hill the amount is small, and it has been par- 

 tially altered into a hornfels (novaculite) (7) because of contact with a 

 diorite which occupies the summit of the hill and stretches on toward 

 Kilburn's Rest for half a mile. 



The section shown (figure 3) crosses Fitch hill a little to the south of 

 figure 2. The order is the same as in figure 2, with the duplication of 



*R. D. Irving and C R. Van Hise : Secondary enlargements of mineral fragments in certain 

 rocks. Bulletin 8, U. S. Geol. Survey. 



