Hiichcock.] 308 [March 5, 
tain range, and narrow bands of clay slate adjacent between them. 
This slate seems to rest upon the Huronian and to underlie the Cods 
group, which occupies the rest of the area between the two talcose 
ranges. The Cods range in New Hampshire is often folded beneath 
the Huronian, and is contiguous to gneiss upon the east. Its quartz- 
ite is often isolated from the other members of the group. Its lith- 
ological character and occurrence in mountainous masses, remind one 
of the hyaline Potsdam quartzite at the west base of the Green 
Mountains. 
Some of the clay slates have been mentioned. Other long and nar- 
row ranges lie upon the Huronian and Coos group, some of which 
carry veins of auriferous quartz. Interesting remnants of it occur 
upon Mount Pequawket, near North Conway. The geological struc- 
ture of Mounts Pequawket and Mote is peculiar. They border the 
valley of the Saco. At their base is the common horizontal granite 
of the Labrador series, capped by perhaps two hundred feet of spotted 
granite. Upon the first of these peaks are two fragments of slate, 
neither of them a mile in length. The conical summits of both moun- 
tains consist at the base of a conglomerate almost exclusively com- 
posed of fragments of slate. Upon Mount Mote there are also anda- 
lusite slate, red feldspar and labradorite pebbles in it. The 
proportion of pebbles diminishes in ascending Mt. Pequawket, and 
they are small and few at the summit. The paste is a feldspathic 
granite. Upon Mount Mote there is a large amount of a greenish 
granite connected with the conglomerate. The character of the 
imbedded pebbles proves these conglomerates to be more recent than 
the clay slates, and they are certainly the newest rocks about the 
White Mountains. 
Fossil corals have been found in Littleton, which resemble those 
described in the Geology of Canada as occurring about Lake Mem- 
phremagog. A slate is associated with them which may be of similar 
age,—the Helderberg. A very large area of this slate occurs in 
Dalton. Mr. Huntington has recently discovered more perfect speci- 
mens of the corals in the town of Flagstaff, Maine. 
These facts indicate that the New Hampshire formations will 
afford us conclusions of immense importance when properly explored. 
The study of the crystalline schists of New England has been 
neglected so much in the past, that less is known of the geology of 
the long settled States of the east than of the newer but flourishing 
commonwealths of the interior. Let us hope that the true order of 
