154 THE DEPTH AND MAEINE DEPOSITS OF THE PACIFIC OCEAN. 



nearly all the northern Pacific, and Red Clay and Globigerina Ooze together 

 the greater part of the southern Pacific. 



The distribution of the different types of deposits in the Pacific Ocean 

 may be briefly summarized as follows: — 



I. Red Glay. — There are nine areas covered by this type, but four are 

 small, viz., one based on a single sounding to the southwest of Galapagos, 

 a second to the west of the New Hebrides, a third in the centre of the 

 Coral Sea, and a fourth in the sea between New Zealand, New Caledonia, 

 and the Fiji Islands. Of the larger areas, one is laid down in the deep 

 water between New Zealand and Tasmania and Australia, extending from 

 25° to 55° south latitude, and having a breadth in its southern portion of 

 about 15° of longitude. Two other areas touch the terrigenous band 

 bordering the west coast of South America, one extending from 5° to 

 35° south latitude, the other extending from 45° to nearly 60° south lati- 

 tude. The remaining two areas of Red Clay are by far the largest, and 

 might be termed the North Pacific area and the South Pacific area respec- 

 tively, though in the one case the Red Clay extends about 18° south of 

 the equator, and in the other about 8° north of the equator. The South 

 Pacific area covers about seven millions of square miles in the centre of 

 the ocean, and is surrounded by Globigerina Ooze and Radiolarian Ooze. 

 The North Pacific area covers about eighteen millions of square miles, 

 and is surrounded by a band of Diatom Ooze in the extreme north, by 

 borders of terrigenous deposits along the coasts of North America and 

 Asia, and by bands of Radiolarian Ooze and Globigerina Ooze on the 

 south. 



II. Globigerina Ooze. — This type covers a large, but very irregular, 

 area in the South Pacific, consisting of two portions joined by a narrow 

 band along the south ; the eastern portion covers an area of about eight 

 millions of square miles, stretching from 8° north to 56° south latitude, 

 and touching the band of terrigenous deposits bordering the west coast 

 of South America both in its northern and southern parts; the western 

 portion is much smaller, and is broken up by areas of Red Clay, of Ptero- 

 pod Ooze, and of terrigenous deposits, stretching from 5° north to 59° 

 south latitude, and from the coasts of Australia and Tasmania to the 

 Chatham, Kermadec, and Friendly groups of islands. Another area of 

 Globigerina Ooze covers about a million square miles in the central part 

 of the Pacific, stretching from 133° to 165° west longitude, and from 12° 



