National Geographic : 1892 Mar 21
24 H. F. Reid-Studies of Muir Glacier. publications of charts and other data making known the more important channels and waterways with ample accuracy for navigation. Southeast of the Alaska-British Columbia boundary the islands become larger and the waterways wider. Cross sound and Icy strait form the northwestern boundary of the archipelago. From them two deep inlets, Lynn canal and Glacier bay, stretch toward the north and northwest, forming, with the Pacific ocean, two peninsulas. The great Fairweather group of mountains occupies the western part of the peninsula between Glacier bay and the Pacific. The eastern part is occupied by another and much lower range, whose peaks rise about 5,000 or 6,000 feet above the sea. Their northeastern slopes are gradual and are covered with large glaciers, some of which reach tide-water and discharge icebergs into Glacier bay. Between these two ranges there seems to be a deep valley, which drains the eastern slopes of the Fairweather group. This is probably filled by a long narrow glacier discharging into Taylor or Dundas bay. Little was known of the peninsula between Glacier bay and Lynn canal before our expedition mapped its northern part, except that it is entirely made up of glacier-bearing mountains, whose peaks are from 5,000 to 7,000 feet high. Northwest of Cross sound the character of the coast changes abruptly; the coast line becomes continuous, without outlying islands, and broken by few inlets; and mountains of great height rise immediately from the water's edge. We can, therefore, topo graphically divide the southeastern coast of Alaska into two regions. The line between them passes along Cross sound ; then follows the valley just northeast of the Fairweather range for 40 or 50 miles, beyond which point we know nothing whatever about it. This topographic difference seems to be accompanied by a geologic difference. Mr Russell has shown that the St. Elias alps are of Tertiary origin; * and probably the Fairweather group belongs to the same range, though I believe it has not been explored. If this is true, the Fairweather mountains are of Tertiary origin, while the rocks forming the mountains about Muir glacier, and probably the rest of the same topographic region toward the southeast, belong to the Paleozoic and Archean.t Another difference is quite marked. Mr Russell has found raised * Nat. Geog. Mag., vol. iii, 1891, p. 172. t See Supplements I and II.
1892 May 15
1892 Feb 19