5SO HARRY FIELDING REID 



of the International Boundary. De Margerie Glacier and the Reid and 

 Lamplugh glaciers at the upper end of Glacier Bay were likewise active and 

 advancing, the two latter moving forward half a mUe from 191 1 to 1913. 

 Rendu Glacier retreated about 4,100 feet from 191 1 to 1913. The adjacent 

 cascading glacier, which was advancing in 191 1, was retreating, and no longer 

 reached tide water in 1913. The southwesternmost tributary of Rendu Glacier 

 advanced in 1913 and pressed out the medial moraines of the Rendu. A cas- 

 cading glacier on the east was probably also advancing. 



Adams Glacier in Muir Inlet retreated about 3,575 feet from 1907 to 1913. 

 Muir also continued to recede. It was more accurately mapped in 1913 than 

 at any time since 1892. Its total recession between these dates was about 

 7f miles. Its decrease in thickness is notable; according to Reid's Survey, the 

 ice surface was 1,500 feet above sea-level in 1892 at the site of the ice-front 

 of 1913; and nunataks, 1,050 and 1,150 feet high, were, at the earlier date, 

 covered by ice to depths of 400-600 feet. Soundings in Muir Inlet in 19 13 

 revealed a depth of 1,128 feet at a point where the ice surface was 1,250 feet 

 above sea-level in 1892. Thus the total thickness of Muir Glacier 5! miles 

 from its 1892 terminus is now known to have been 2,378 feet. Soundings like- 

 wise show that in Tarr Inlet (at the upper end of Glacier Bay) the ice of Grand 

 Pacific Glacier at a point 12 miles from the terminus of 1894 was at least 2,500 

 feet thick. 

 . Near Lynn Canal. — R. G. McConnell reports that the Rainy Hollow or 

 Sullivan Glacier had advanced about 2,000 feet before it was observed in 19 10 

 by Webster Brown, making a total advance of about three-quarters of a mile 

 in less than ten months. It receded slightly between 1910 and 1913. Jarvis 

 Creek Glacier likewise advanced in 19 10. The detailed map of the Menden- 

 hall. Eagle, Herbert, and adjacent glaciers east of Lynn Canal,^ is accompanied 

 by cursory notes on these ice tongues by Knopf. 



Yakutat Bay. — Since 19 10 Hidden Glacier has retreated 400-500 feet at 

 the terminus and thinned 150 feet or more at the north margin. The tide- 

 water terminus of Nunatak Glacier retreated slightly from 1912 to 1913. 

 The adjacent cascading glacier advanced several hundred feet from 1910 to 

 1913. Hubbard Glacier receded slightly. Turner Glacier suffered a more 

 pronounced diminution, especially at its south margin. 



Mount St. Elias Region.— -'North of Mount St. Elias the Logan-Chitina 

 Glacier changed from spasmodic, earthquake-stimulated activity in 1912 to 

 stagnation in 1913, as reported by D. W. Eaton and J. D. Craig of the Inter- 

 national Boundary Surveys. Its margin receded 30-50 feet during the year. 

 A number of the ice tongues south of Logan Glacier were first mapped in 19 13. 

 The surveyors 'saw no unusual activity between Logan Glacier and Mount 

 St. Elias but report that ablation during cloudy, rainy weather in July lowered 

 the ice surface at a measured rate of between 3 and 4 inches per day. 



^Bull. No. 502, U.S. Geol. Survey, 1912. 



