By Harold Stowell
The main robust forces on the earth have formed the panorama of Southeast Alaska. Scientists and viewers from world wide trek north to event wild rivers, strong glaciers, and breathtaking mountain peaks. Now, for the 1st time, a convenient consultant to the sector is out there. entire with colour illustrations revealing hundreds of thousands of years of geological historical past and in-depth descriptions of Sitka, Juneau, and Glacier Bay, Geology of Southeast Alaska is vital analyzing for someone desirous about rock and ice in movement. Written by means of a geologist with over twenty-five years of expertise within the north, Geology of Southeast Alaska will entertain and tell with plentiful images and specific drawings. even if you need to comprehend the forces that formed the nation of Alaska, otherwise you are looking to research the fundamentals of glacial move, this compact, authoritative booklet is for you.
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Additional info for Geology of Southeast Alaska: Rock and Ice in Motion
These U-shaped valleys are easily distinguished from valleys cut by running water, which instead have a V-shape with shallower, sloping sides and a narrow ﬂoor. Glacial valleys that are ﬂooded by the ocean are called fjords. These snaking arms of the sea are often long, narrow, winding passageways (Figure 8) that may be more than a thousand feet Tracy Arm fjord viewed from about 3,000 feet (915 m) above sea level on the south side of Sweetheart Ridge. The 6,666-foot (2,020-m) summit of Mt. Sumdum is in the clouds along the horizon.
The principal culprit is the Queen Charlotte–Fairweather fault located offshore along the west coast of Baranof and Chichagof islands and intersecting the mainland west of Glacier Bay (Figure 17). Most of the other large-scale faults in Southeast Alaska are historically inactive, including the Chatham Strait fault, which separates Baranof and Chichagof islands from Admiralty Island, and faults in the Coast shear zone, which parallels the western edge of the Coast Mountains. 39 40 CHAPTER 5 The Floating Crust: Isostacy The distribution of ocean basins, continental plains, and mountains can be attributed to different types and thicknesses of crust ﬂoating on the underlying mantle.
Terrane map of Southeast Alaska, showing the Chugach, Wrangellia, and Alexander terranes, the Intermontane superterrane, subdivisions of the Coast Plutonic Complex, and the Coast shear zone. A = Admiralty Island, B = Baranof Island, C = Chichagof Island, K = Kupreanof Island, POW = Prince of Wales Island, and QC = Queen Charlotte Islands. 8 cm/yr) Dixon Entrance Prince Rupert N QC 100 km 62 miles Insular superterrane Coast Plutonic Complex Chugach terrane western metamorphic belt (Alexander, Wrangellia, and Intermontane terranes, and Gravina Belt) central pluton-gneiss belt Wrangellia terrane Coast Plutonic Complex sill Alexander terrane eastern metamorphic belt (Intermontane superterrane) Yakutat block 50 CHAPTER 6 top of the Alexander terrane.