156 THE DEPTH A^J) MARESTE DEPOSITS OE THE PACIEIC OCEAN. 



in the neighborhood of the Great Barrier Reef of AustraHa and the Fiji 

 group of islands, and a few among the islands of the Paumotu and Marquesas 

 groups, the aggregate area being relatively very small. This deposit may be 

 said to be limited to tropical and sub-tropical areas where the depth is less 

 than 1500 fathoms at a considerable distance from land. 



VI. Coral Mud and Sand. — These deposits are found encircling the many 

 coral islands in the tropical and subtropical regions of the Pacific, and off the 

 Great Barrier Reef of Australia, the aggregate area covered by these types 

 being estimated to exceed a million square miles. 



VII. Other Terrigenous Deposits.— The terrigenous deposits other than Coral 

 Mud and Sand cover an area of about eight millions of square miles, forming 

 a border around the shores of the Pacific, and around the continental and 

 volcanic islands, like Japan, the Phihppines, New Guinea, the Solomons, the 

 New Hebrides, Tasmania, New Zealand, etc. Blue Mud covers that part of 

 the ocean between the Diatom Ooze of the far south and the Antarctic conti- 

 nent, forming part of the great circumpolar band bordering that continent. 



