Huntington.] 290 [October 1, 
down the side of the mountain, this is the only rock. The Chocorua 
granite seems to have been a subsequent intrusion, since it forms 
necks that appear to have been protuded into the common, or Con- 
way, granite without overflowing it. West of Rocky Branch, the — 
only granite that outcrops, except on the point between it and the 
Saco, is the common variety — at least, until we get west of Bartlett. 
It is possible that the last two may be contemporaneous, but they 
are so unlike in their physical characters, and the line between them 
where they come in contact is so sharply defined, that it makes it 
more than probable that they belong to different periods of intrusion. 
North of this granitic area in Bartlett, and westward, we have the 
coarse mica-schists and gneisses of the White Mountains. They 
form the summit of Iron Mountain, and here have a high, though 
variable, northerly dip. 
In the granite, about ninety rods south of the line of the schist, we 
find the iron. The rock in the immediate vicinity of the iron is fre- 
quently discolored with manganese, and we have already noticed the 
fact that rhodonite and feldspar here forms a rock. ‘This deposit of 
iron has been known for many years, and it was first noticed by Gen. 
Meserve, of Jackson, soon after the forests were destroyed by fire. 
It was visited by Dr. Chas. T. Jackson when he made the geological 
survey of the State, and it is thus described by him: “ One of the 
veins at the upper opening measures thirty-seven feet in width in an 
-east-and-west, and sixteen in a north-and-south, direction. The sec- 
ond opening, two hundred feet lower down the slope of the hill, ex- 
poses the ore, maintaining the same width. Three hundred feet 
lower down the vein is observed to narrow, and is but ten feet wide, 
and four hundred feet farther the width increases to fifty-five feet. 
Five hundred and forty-six feet lower still there is a small opening, 
or cave, twenty feet deep, where the ore narrows again. On search- 
ing to the westward of this great vein, at a distance, we soon discov- 
ered a new one, which appears to be of the largest dimensions... . 
Forty-nine feet farther westward the soil is full of angular fragments 
of the ore, indicating another vein. It is evident that this mountain 
is intersected by a great number of veins of excellent iron ore, and 
will furnish an inexhaustible supply. It is proper here to remark 
that it is composed chiefly of the peroxide of iron combined with a 
small proportien of the protoxide, and it contains a little man- 
-ganese.” 
