Discovery reports (1953) Discovery reports discoveryreports25inst Year: 1953 76 DISCOVERY REPORTS 5000 m. (2734 fm.) were obtained here by the ' Discovery II' and it is probable that these are connected by a small trench. Forty-five miles approximately west-by-south of this is another small area where depths of more than 5000 m. were obtained by the 'Meteor' in 1926. The area between these soundings and those taken by us is completely unsounded and it is reasonable to suppose that further observations will show that a long but narrow trench extends over the whole distance. North of our 5000
Discovery reports (1953) Discovery reports discoveryreports25inst Year: 1953 76 DISCOVERY REPORTS 5000 m. (2734 fm.) were obtained here by the ' Discovery II' and it is probable that these are connected by a small trench. Forty-five miles approximately west-by-south of this is another small area where depths of more than 5000 m. were obtained by the 'Meteor' in 1926. The area between these soundings and those taken by us is completely unsounded and it is reasonable to suppose that further observations will show that a long but narrow trench extends over the whole distance. North of our 5000 m. soundings is a small bank, with depths of less than 2000 m. (1094 fm.). In fact, this area is very similar in structure to the area north of the South Orkney Islands, except that the slope from the deep water here appears to be slight but regular and the shelf to the north of the South Shetlands is fairly wide. 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 ex
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