156 THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 
in the neighborhood of the Great Barrier Reef of Australia 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 Philippines, 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. 
