|
Detailed information on frontal positions can be derived from several published maps and a variety of government documents. The first map to show a dated icefront was a sketch map produced by Albrecht Penck (Penck, 1898) (Fig. 4). Penck estimated the position of the terminus in 1897 by pacing the distance from the ice to large boulders in the forefield. He established four reference points near the terminus and reported compass bearings, paced distances and aneroid readings. This was followed by a detailed, longterm icefront mapping programme conducted by the Vaux family from 1898-1912. Using theodolite surveys from fixed locations they produced at least three large scale icefront maps (Vaux and Vaux, 1899, plate xx, Vaux and Vaux, 1900, p.6, Vaux and Vaux, 1907, p.149). The map produced by Vaux and Vaux (1907) is the most detailed (Fig. 5).
Collier (1958) provides a summary map (Fig. 6) and cross-sectional profiles of the terminal zone as mapped by the D.W.P.B. from 1945-56. The surveys were repeated in 1958, 1960 and 1962. The maps and surveyed cross-sectional profiles of the snout are available as Water Survey of Canada unpublished reports (Polvi, 1958, 1961, Ramsden, 1962). The D.W.P.B. reported distances from reference rocks identified in the Vaux maps but the D.W.P.B. maps do not show the terminus locations that had been so carefully recorded by the Vaux family.
|
