i 94 DISCOVERY REPORTS 



GROUP B 

 The distribution of this group, like that of group A, is confined to the southern part 

 of the region, and occurs only to the north-east, east and south of the Falkland Islands. 

 A line extending in a north-easterly direction from long. 59 30' W off the north coast 

 of West Falkland Island forms the north-eastern boundary of the area, while a line 

 extending in a south-easterly direction from the edge of the coastal belt of deposits of 

 group A, south of the western extremity of West Falkland Island, forms the south- 

 eastern boundary. Within these boundaries deposits of group B cover the continental 

 slope and the coastal shelf, except for the coastal belt of group A deposits off the south 

 coasts of the Falkland Islands and the patch of group A deposits lying on the continental 

 shelf to the north-east of East Falkland Island. They also occur in the southern end of 

 Falkland Sound. The northern part of the area as far south as lat. 51 30' S consists 

 entirely of type B 2, which appears also to form the deposits on the continental shelf east 

 of East Falkland Island. On the continental slope south and east of the Falkland 

 Islands type B4 predominates, while a patch of type B3 occurs just below the 200 m. 

 contour west of Beauchene Island. The deposits in the eastern end of Falkland Sound 



consist of type B 1 . 



GROUP C 



Deposits of group C cover a large area of the continental shelf. At the north of the 

 region examined they cover the continental shelf to the edge of the continental slope 

 nearly as far south as lat. 45 S, with the exception of a broad coastal belt south of 

 Delgada Point. These deposits are of the type C2, with the type C3 occurring at the 

 south-east point of the area. 



A large area stretching west and north from the coastal belt of group F deposits 

 between Point Deseado and Point Santa Cruz covers about half of the continental shelf 

 in its southern part, and about three-quarters of it in its northern part. At about its 

 centre it reaches as far east as the edge of the continental slope. Types C 1 and C 2 

 occupy all the northern half of the area and the area on the western or coastal part of 

 the southern half. The eastern or outer part of the southern half consists of types of 

 higher index number, type C5 occurring to the north and C4 to the south. Type C6 

 occurs at the extreme south-east point of the area, while type C7 intrudes to the east 

 on to the type C 1 and C 2 portions of the area in lat. 48° 20' S, long. 65 20' W. North 

 of this lies a small area of type C3. 



A third area bearing deposits of group C stretches north-east from the coast of Tierra 

 del Fuego as far as lat. 51 40' S, long. 65 W, separated from the entrance of the 

 Strait of Magellan by a coastal belt of group E deposits. The index number of the 

 types increases from type C4 in the northern part of the area through type C5 in the 

 central part, to type C 6 in the southern part. 



GROUP D 

 The main area covered by deposits of group D lies in the southern part of the region 

 under consideration. Between Point San Julian and the entrance of the Strait of 



