248 SURFACE GEOLOGY. 
come down the mountain. The greatest angle of descent, 42°, occurs in the upper and 
lower of the four sections, and the least angle of 18° is in the third section from the 
top. The minimum widths of the four sections are 10, 15, 20, and 30 metres; the 
maximum 15, 20, 30, and 90 metres. The minimum depths of the excavation were 15, 
10, 5, and 3 metres; the maximum 18, 15, 10, and 10 metres. 
Mr. Sweetser, in his guide-book, speaks ofa line of boulders in the Carter Notch 
which may have had some connection with glacial action. At the south entrance of 
the Notch is a lofty line of immense boulders, piled on each other in inextricable confu- 
sion, and affording some of the most remarkable rock scenery in the mountains. They 
are rugged and deeply pitted, like the rocks on the cone of Mt. Washington, and 
may have been derived from the crests of the adjacent peaks. One or two of these 
boulders are near seventy feet long each. 
Returning to Jackson, we find a tributary of the Wildcat coming from 
the north-east, and uniting with it about a mile above the falls, which 
ought to show a few glacial traces. I found nothing very characteristic, 
unless it were a few boulders of a peculiar porphyritic granite. I think 
these must have been derived from the north, as nothing like them is 
known in ledges west of Mt. Baldface, or “Peaked,” a summit so called 
by Packard, and not named upon our map. The striz upon these moun- 
tains do not point towards Jackson, as they belong to the older set. Mr. 
Packard says,—“On the summit [of Baldface, where the striz run S. 
23°-28° E.] rest several angular boulders of a peculiar porphyritic sienite, 
containing curious oblong crystals of albitic feldspar. Our guide to their 
and, by 
investigation, he found the rock zz szt# upon that eminence. The por- 
phyritic boulders found by me did not come from the mountains men- 
tioned by Packard, as the rubbish derived from them would have gone 
down the east branch of the Saco, joining the main stream in Lower 
Bartlett. Further search will develop evidences of the existence of this 
glacier in the east branch. Packard speaks of staurolite mica schist 
boulders on the north flank of Mt. Pequawket, saying “they must have 
been borne down on the back of the glacier from Mt. Washington.” 
This is hardly probable, since the rock occurs on both the north and 
south sides of Pequawket, and the boulders are even more abundant on 
the south side of the mountain. Jackson Falls village is situated in a 
hopper-shaped depression considerably open on the west side. Pickett, 
Thorn, and Tin mountains constitute the north and east rims, Black and 
” 
source—the trusty ice grooves—points to Peaked mountain; 
