. Fig. 15. The Scotia Arc. Positions of soundings and contours of the bottom for the section of the Arc between the South Orkneys and Clarence Island. Between King George Island and Elephant Island information is scanty, but such evidence as is available no longer supports our original conception of a connexion here at depths of less than 250 m. (137 fm.); it now appears more likely that the average depth of water on the ridge is less than 500 m. (273 fm.), with a small bank of less than 250 m. in the centre. To the north of Elephant Island one line of soundings, however, showed that the rise
. Fig. 15. The Scotia Arc. Positions of soundings and contours of the bottom for the section of the Arc between the South Orkneys and Clarence Island. Between King George Island and Elephant Island information is scanty, but such evidence as is available no longer supports our original conception of a connexion here at depths of less than 250 m. (137 fm.); it now appears more likely that the average depth of water on the ridge is less than 500 m. (273 fm.), with a small bank of less than 250 m. in the centre. To the north of Elephant Island one line of soundings, however, showed that the rise from 1872 fm. (3423 m.) to 151 fm. (276 m.) was at an angle of approximately 13°. If we now consider the contours of the Bransfield Strait in conjunction with those of the bottom west of Clarence Island it will be found that the deeper water of the strait can be traced, by means of the looom. (547 fm.) contours, to a position to the north of Coronation Island, South Orkneys. Admittedly, the trough south of Clarence Island is very narrow, but there can be little doubt that it exists. The average depth of water on the ridge south of the trough is less than 1000 m. for a large part of its length; it seldom exceeds 2000 m. (1094 fm.) in depth and there is an extensive area south of Clarence Island where the soundings are less than 500 m. (273 fm.). The least depth determined by us on this
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