154 STRATIGRAPHICAL GEOLOGY. 



find a rock different from anything that has been mentioned. In its 

 several varieties it occupies the whole of the Chocorua group of eleva- 

 tions. That first seen is much weathered, of a reddish cast, sometimes 

 manganesian. The feldsjDar predominates in crystalline bunches ; the 

 quartz is not abundant; and the black scaly mineral is apt to be horn- 

 blende. In other samples from this spur the quartz is abundant, and the 

 mica or hornblende is scanty. Similar rocks extend to the very summit. 

 Scarcely anywhere else is it so difficult to appreciate the normal ajapear- 

 ance of the rock, on account of extensive and complete weathering. In 

 favored localities the granite assumes a greenish color, the feldspar at 

 first sight resembling labradorite. A typical variety consists only of this 

 greenish feldspar, apparently orthoclase and amorphous smoky quartz, 

 very like that noticed heretofore from Lightning mountain in Strafford. 

 (No. 443 of Mr. Huntington's catalogue.) At the east base of the peak 

 there is a similar rock of greenish color, very fine-grained, prevailing to 

 the exclusion of everything else. These two types of rock represent our 

 Chocorua granite. I have called them labradorite, perhaps erroneously, 

 in our first volume. As they will require further study before receiving 

 their proper designations, I need only to speak of the behavior of the 

 mass in relation to the other rocks. The specimens from the north-east 

 base of Chocorua peak and the summits to the east are labelled as Albany 

 granite, though they somewhat resemble the other. This variety has not 

 yet been discovered on the route between Piper's and the summit of the 

 peak, while on the north-east it seems to take its proper place between 

 the Conway and Chocorua varieties. Hence our order of succession from 

 the starting-point seems to be, first, the Concord, second, Conway, third, 

 Chocorua granite. In Fig. 6i, Vol. I, one sees how the Chocorua mass 

 is separated topographically from everything else. 



Mr. Morse's panorama from Chocorua in the Atlas shows incident- 

 ally the slightly inclined — 25° N. W. — jointed planes in his foreground. 

 Others nearly at right angles to this appear upon the summits, one in 

 particular of immense extent. They are prominent along the ridge for 

 half a mile. 



This peculiar granite occupies a larger area in this neighborhood than 

 is elsewhere known. It occurs all the way to Ellen's falls on the north, 

 at three and one fourth miles west, and perhaps farther ; to the south it 



