National Geographic : 1892 Mar 21
II. F+.Reid-Studies of Muir Glacier. cier, and is about a mile wide. Its surface bears a number of shallow lakes; and here and there deep ravines mark the posi tions of former watercourses. The western subglacial stream has cut a gorge through this plateau, and exposed the buried forest described by Professor Wright (see page 39). For three quarters of its length, the plateau ends on the water side in pre cipitous bluffs, below which there is a narrow beach, only covered by the highest tides. On the eastern side the bluffs only extend for a half mile or so; the upper surface of the deposit is not a plateau, but slopes gradually down to the bed of the glacial stream at the foot of the mountains. This stream empties into the inlet just below where the bluffs end. South of the stream the deposits slope gradually up from the beach to a height of about 400 feet against the mountain side.* The inlet is quite deep. Professor Wright reports a sounding by Captain Hunter of 516 feet about 1,300 yards south of the present position of the ice front. Captain Carroll last summer (1890) found within a hundred yards of the ice-front a depth of 720 feet. This does not necessarily indicate that the inlet in creases in depth as we approach the immediate neighborhood of the ice, for the earlier sounding may not have been taken in the deepest part of the channel. MUIR GLACIER. General Features. Muir glacier occupies a depression in the mountains about 35 miles long and from 6 to 10 wide. It is fed by a great number of tributaries, of which the first northern, the second northern, and the northwestern are by far the largest. These again are made up of many smaller glaciers. The general slope of the surface, based on a barometric reading made between Tree mountain and Granite canyon, is about 1° 15'. The appearance of the glacier toward the northwest indicates that the slope there is about the same. The total area drained by this system is about 800 square miles; the actual surface of the ice being about 350 square miles. The area draining into Muir inlet is about * For an excellent description of these deposits see " Notes on the Muir glacier region" by Mr H. P. Cushing in Am. Geol., vol. viii, 1891, pp. 207-230, pl. iii, and map; c. f. ibid., vol. ix, 1892, pp. 190-197.
1892 May 15
1892 Feb 19