MARINE DEPOSITS OF PATAGONIA 195 



Magellan a belt of groups E and F lines the coast: outside this belt an extensive area of 

 deposits of group D stretches eastward as far as long. 65 W. Here it sends a wide limb 

 in a southerly direction towards Staten Island, outside the areas covered by deposits of 

 groups C and A, bounded on the east approximately by the 200 m. contour at the edge 

 of the bay of deeper water extending in a northerly direction between the Falkland 

 Islands and South America. North of this southerly-directed limb the area extends to 

 the east to about long. 6i° 40' W, where it approaches closely the deposits of group A 

 off the Jason Islands. Here a narrower neck joins it to an area occupying the centre of 

 the continental shelf between lat. 48 20' and 50 S. The northern part of this latter 

 area consists of type D4, the remainder of type D 1. The narrow neck joining it to the 

 rest of the area covered by deposits of this group consists of type D 5 which also occurs 

 in a northerly directed extension of the main area and along the adjacent eastern border. 

 Type D4 forms most of the southerly directed limb, with type D3 appearing on the 

 east and type D5 on the west of its northern half. 



Types D 1 and D2 occupy the central part of the area, type D 1 occurring again near 

 the coast between Point Gallegos and Point Santa Cruz; the intermediate portion is 

 covered by deposits of types D3 and D4. 



Another area covered by deposits of group D lies on the eastern third of the con- 

 tinental shelf between lat. 44 30' and 46 40' S. Between 46 and 46 40' S it bends 

 towards the south-east and extends out to the edge of the continental slope. The de- 

 posits of this area consist entirely of type D 1 . A further small area covered by deposits 

 of group D lies east of Cape Tres Puntas and stretches over the continental shelf as far 

 as the area covered by deposits of group F. It consists of type D5. 



GROUP E 



Deposits of group E occur in scattered areas, of smaller extent than those of most of 

 the other groups, in all parts of the region. The largest area covered by deposits of this 

 group lies off the coast between Delgada Point and Cape Tres Puntas, including the 

 Gulf of San Jorge. The northern part of this area consists of deposits of type E3, while 

 the Gulf of San Jorge and the area to the east of it consist of deposits of type E 1. East 

 of the Gulf of San Jorge at the edge of the continental shelf an area of deposits of 

 group E occurs; on the continental shelf the type is E3, whilst on the continental slope 

 it is E2. 



A coastal belt running from Point Santa Cruz to San Sebastian Bay in Tierra del 

 Fuego consists of deposits of type Ei as far south as Cape Virgins, where type E2 

 appears, while the remainder off the entrance of the Strait of Magellan consists of 

 type E 3 . 



On the Burdwood Bank deposits of the type E4 cover the western part of the summit 

 and adjoin deposits of type E2 lying on the western slope. 



Two isolated patches of deposits of type E occur, one at the edge of the slope to 

 deeper water between the Falkland Islands and Tierra del Fuego in lat. 52 40' S, long. 



