380 DESCRIPTION OF THE COUNTRY BORDERING 
gorges still show large sections of holes, some of them, as along the margin of the 
upper gorge, high above the present water-level; while below them are the remains 
of potholes, some wholly, and others partially, broken into by the channel. In 
addition to the enlargement of the potholes by grinding, the freezing of water in 
them in winter has contributed, no doubt, towards breaking them into the gorge. 
The preceding sketch will illustrate the manner in which they occur. 
The highest point near the lake-shore, between Fond du Lac Supérieure and 
Pigeon River, is a hill which bears due north from a point on the shore half a mile 
below the mouth of Kawimbash River. The distance from that point to the sum- 
mit of the hill is about four miles. It was proposed by Colonel Whittlesey, who 
ascended. it in company with Mr. R. B. Carlton, in 1848, to call it Carlton’s Peak. 
It was measured, barometrically, by Major Richard Owen, in 1849, and the summit 
found to be nine hundred and thirty-seven feet above the level of the Lake. It is 
a prominent and important landmark to the voyageur, and commands a view of 
Point Keweenaw, the Porcupine Mountains, and a long extent of the south coast of 
the Lake. It also overlooks a large section of the country to the north. At the 
distance of twelve or fifteen miles to the northwest are several ridges, which appear 
to rise to about the same height as the Peak, and one of them, perhaps, is higher. 
The summits of the highest intervening ridges, some of which were measured, are 
only a little over seven hundred feet above the lake-level. 
The summit of Carlton’s Peak is composed entirely of felspar rock, which appears 
to have been erupted in the form of a dike, bearing east and west (No. 148). On 
the side next the Lake, and one hundred and seventy feet below the summit, No. 
149 appears, bearing northeast and southwest; and one hundred and ninety-six 
feet. below this, where the gentle descent to the Lake begins, No. 150 comes up, 
and forms a ridge about sixty feet above the general slope. Continuing to descend, 
a quarter of a mile further, is a ridge of greenstone, eighty feet high; and between 
this and the Lake are two low ridges of No. 150, which appear to be the same as 
the overlying rock found at numerous points on the lake-shore. Between all these 
ridges cedar swamps occur, and the rocks are entirely concealed, except at the 
summits of the ridges. The rocks underlying No. 150, however, are believed to be 
the same as those found on Kawimbash and Inaonani Rivers, and at the lake- 
shore. An analy sis of the rock forming this peak (No. 148), yielded the results 
given beige 
* BB.—Fuses with difficulty on the edges ; with soda on charcoal, forms a white enamel ; with borax, 
a colourless glass; with solution of cobalt, the fused edges become blue. Held in the forceps, a thin 
splinter fuses to a globule at the point, with ee the globule being, when cool, white and 
blebby. Sp. Gr. 2:710.—Streak grayish white 
Matters insoluble in Cl H.  -522. 
Silica, ; : 462 
Alumina, a a trace ae iron, ; ‘ B46 
Magnesia, . ; : : : “015 
ime, ‘115 
Potash, O17 
Soda, 010 
