fossils 463 



Syringopora with slender corallites. 



Favosites, at least two species. 



Conchidium cfr. knighti. 



Gastropod related to Polytrophis alatum Lindstrom. 



(See Pumpelly in Amer. Jour. Sci., iii, 35, 1888, pp. 79-80.) 



SPECIMENS FROM LAKE MEMPHREMAGOG 



Mr Schuchert has also examined a collection of fossils from Owls head, 

 lake Memphremagog, about 60 miles to the north of Littleton. No Silu- 

 rian species were found among them. He reports that they represent the 

 typical Onondaga limestone fauna of the New York Devonian. 



Mr A. E. Lambert, a graduate student at Dartmouth College, has made 

 further collections of the Littleton fossils, and has furnished a description 

 and photographs of the Dalmanites, which are appended to this paper. 



THE TYPICAL FOSSILIFEROUS AREA 



The best localities are within an area 7 miles long and 2 or 3 miles 

 wide, from the north part of Littleton to the north part of Lisbon. 

 Limestone is not well shown beyond the south base of Manns hill, and 

 the old Clark and Burnham quarries are on what is sometimes called 

 Farr hill. The associated rocks cross Manns hill into Dalton. I can not 

 present a satisfactory section at the north end of the tract because of the 

 existence of dislocations which are not understood. On the east there is 

 a foliated granite, a mile and a half in width, reaching nearly to the 

 Parker observatory on the top of Palmer mountain. This summit is 

 occupied by slates, with a general northwesterly dip of the cleavage, 

 which are allied to those to be mentioned farther south. Some of the 

 strata are silicious. A mile west, on the ridge between the sources of 

 Palmer and Parker brooks, the limestone appears, 60 feet wide where 

 quarried, and carrying Favosites and crinoidal fragments. A sandstone 

 flanks the limestone to the west. All the dips are about vertical. It is 

 succeeded on the west side by an argillitic schist allied to hornfels. 



The sandy rock is sometimes a well defined sandstone (a quartzite) 

 and a partial or complete aggregate of crystals of quartz developed in a 

 slate or in pure limestone. Because of the angularities it is somewhat 

 analogous to the buhrstone used for millstones, and has locally received 

 that appellation. On the whole it is probable that the band represents 

 a single horizon, while it is easy to understand its origin from a sand, 

 slate, or limestone. Imagine these rocks permeated by water carrying 

 silica in solution. Crystals may form either by themselves or on grains 

 of sand for nuclei, and the result will be a rock mostly composed of 



