Recent shore-line changes along the Pacific coast of Alaska

Geologic reconnaissance of possible powersites at Tyee, Eagle, and Spur Mountain Lakes, southeastern Alaska

“…Evidence of recent movement along the Coast Eange lineament is lacking. However, the region seems to be subject to crustal unrest as shown by post-Pleistocene uplift (Twenhofel, 1952). The uplift can be attributed to either glacial rebound or tectonic disturbances, but in either case such adjustments could be accompanied by seismic shocks.…”

“…In addition to the lineaments described, which are of local significance only, segments of several lineaments of regional significance traverse the study area. Bell Arm, Burroughs Bay, and the valley of the Unuk Eiver are parts of a system of east-northeast-trending lineaments which were interpreted as faults by Twenhofel andSainsbury (1958, p. 1442). A lineament of similar size extends parallel to the Unuk Eiver from the Hulakon Eiver northeastward across Spur Mountain for about 15 miles and includes the upper valley of Spur Mountain Lake.…”

Reconnaissance engineering geology of the Metlakatla area, Annette Island, Alaska, with emphasis on evaluation of earthquakes and other geologic hazards

“…2) at an altitude of 200-300 ft (60-90 m), where a large area of marine planation and shore deposits was interpreted by W. H. Condon (in Berg, 1973, p. 34). Shore deposits of marine origin are recorded at similar and higher altitudes elsewhere in the southern part of southeastern Alaska and nearby British Columbia (Dolmage, 1923;Twenhofel, 1952;Clague, 1975 Stuckenrath andMielke, 1973, p. 395), and from the central part of the east coast of Prince of Wales Island, 50 mi (80 km) northwest of Metlakatla at an altitude of about 30 ft (9 m) (9,510±280 years B.P., 1-1621; Swanston, 1969a).…”

Reconnaissance geology of Admiralty Island, Alaska

“…Twenhofel andSainsbury (1958, p. 1442) postulate that the distribution of mineral deposits, particularly the gold-bearing lodes, in the Juneau district is related to the position of regional faults. The results of the present investigation neither confirm nor deny this theory.…”