feldspar and quartz except at its bottom. Here rock fragments predomi- 

 nate, and the texture is sandy mud. Also, this core contains 30 percent 

 Globigerinoides at its top and traces of coral fragments, benthic fora- 

 minlfera, sponge spicules, fecal pellets, and radiolaria in segments 

 throughout its length. 



c. One sediment sample was obtained from the bottom Nansen 

 bottle of a BURTON ISLAND cast in 1,300 fathoms of water at the base 

 of the Antarctic Continental Slope. Although this sample was collected 

 at 70 6 it8'S, it contained 80 percent Globigerinoides, 5 percent spicules, 

 and only 15 percent inorganic constituents. Its contents may result 

 from slump of material down the Continental Slope. 



3. Peter I Island Area 



a. North of the Bellingshausen Sea, 2 cores were obtained in 

 the vicinity of Peter I Island. BURTON ISLAND sample 9, taken in 1,^50 

 fathoms on the island's western slope, averaged 95 percent volcanic ash 

 and 5 percent plankton! c biological remains. GLACIER sample 15 was 

 obtained in 2,025 fathoms about 9° miles east of Peter I Island. This 

 core consists of silty clay throughout, but has some sandy constituents 

 in the 2 to 5* 7»5 to 9*25, and 23 to 25 inch segments. Feldspar is the 

 predominant mineral while volcanic glass, rock fragments, and quartz are 

 secondary. Radiolarians are the most common biological constituent and 

 reach a maximum of 30 percent at the top. In certain segments, fecal 

 pellets are prominent. 



k. Adelaide Island Area 



a. Five bottom sediment samples were obtained from GLACIER in 

 the vicinity of Adelaide Island. Three of these were at the north end 

 off Matha Strait while the other two were %5 miles west of the south 

 end. These two groups of cores are remarkedly different in texture, 



but are similar in the distribution of organic and inorganic constituents. 



The cores off Matha Strait are composed of grayish olive gravel and 

 pebbly sand to a depth of 6 inches. Only one core penetrates deeper 

 than this, and it contains medium bluish gray clayey silt from here to the 

 bottom with an increase in amount of the sand fraction at 6 to 8 inches 

 and 16.5 to 18 • 5 inches. Feldspar in the predominant mineral constituent 

 of this core while quartz and rock fragments are secondary. Volcanic 

 glass averages 10 to 15 percent from the 3- through lk. 5-inch segment, 

 and a trace of pyrite is evident from 1^.5 inches to the bottom. Traces 

 of plankton! c micro-organisms, sponge spicules, and fecal pellets exhibit 

 an irregular distribution up to 10 percent throughout the core. However, 

 these range from 20 to 25 percent of the sand size in the upper 8 inches. 



b. Both southern cores consist of grayish olive silty clay or 

 clayey silt of medium low to medium sphericity from their tops to a depth 



50 



