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



ite, Bethlehem Jgranite, Lake gneiss, diorites, and protogenes, to say noth- 

 ing of what has always been recognized as granite and diabase. The 

 periods of their extrusion were evidently middle or late Paleozoic. 



5. It is a fine field for the study of the metamorphism of sediments 

 and the foliation of eruptives. There are illustrations of contact phe- 

 nomena, the formation of hornfels and argillitic schists, a secondary en- 

 largement of minerals, the modification of the forms of pebbles, the 

 development of large garnets and staurolite, and the obliteration of the 

 planes of stratification. 



6. The general results of our studies tend to restrict the areas of the 

 more ancient rocks, and to increase those representing the Paleozoic 

 groups in the adjoining regions of northern New England. 



Description of Dalmanites lunatus; by Avery E. Lambert 



The only fossil bearing locality that has, as yet, been reported in the 

 state of New Hampshire is in the town of Littleton, about 2 miles to the 

 west and north of the village. 



The fossiliferous character of this area w T as discovered by Professor 

 C. H. Hitchcock in 1870, while, as state geologist, he was engaged in 

 studying the region. 



The fossils, mainly coralline in character, were sent to Mr Billings, a 

 Canadian geologist, for identification. Mr Billings believed, from the 

 evidence which they presented, that the general term " Helderberg " 

 could be applied to indicate the geologic horizon of this area, but later 

 observations seem to justify the conclusion reached by Walcott that it 

 belongs to the Niagara. 



The first mention of trilobites occurring in this region is to be found 

 in a report by T. Nelson Dale.* The material found by Mr Dale was 

 examined by C. D. Walcott, who identified the trilobite with Dalmanites 

 limulurus.f 



The locality in which the trilobite occurs is on the northern slope of a 

 range of hills known as the Blueberry mountains. This particular sec- 

 tion of the range is owned by Mr Frank Fitch, its local designation 

 being " Fitch hill. 1 ' The fossil bearing locks are distant from the road 

 some 400 or 500 feet. 



In ascending the hill from the road which passes in front of Mr 

 Fitch's residence one crosses first a stratum of igneous rock. Superim- 

 posed on it is a layer of limestone, ranging from 30 to 40 feet in thick- 

 ness, in which numerous coralline fragments abound. Lying on this is 

 the calciferous slate, in which the trilobites occur. This layer is from 6 

 to 10 feet thick and gradually merges into the undertying limestone. 



*Proc. Canadian Institute, Toronto, vol. xxii, no. 146, p. 69. 

 t Am. Jour. Sci., series iii, vol. 35, 1888, pp. 79-80. 



