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10 THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 
mica being also present; fragments of a well-rounded pebble of black chert, traversed by 
microscopic quartz veins. 
“ How these pebbles, having all the characteristics of glacial-worn pebbles, came to be 
carried to this point is an interesting question. As the sharks’ teeth and cetacean bones 
found in the red clay seem to indicate that since tertiary times there have been but very 
insignificant deposits at great distance from continental areas, similarly we may be tempted 
to assume that these pebbles, which could not have been transported to their present 
locality by any agency of the present epoch, were carried to it during the glacial epoch, 
the thin coating of manganese indicating how small have been the bottom deposits since 
the glacial period.” ... 
“We could find no spherules of cosmic iron in the few samples of 
manganese nodules which we ground to powder. . 
“At Station 13, in 2690 fathoms, lat. 9° 57’ N., long. 187° 47’ W., 
. the ‘Blake’ trawl came up full of large manganese nodules, balls 
varying in diameter from 43 to over 6 inches ; a few of the largest measured 
; inches in diameter. . . . The manganese nodules were all more or less 
mammary ; this is specially well-developed in the flat pieces. . 
“ At Station 31, in 2700 fathoms, lat. 12° 20’ S., long. 144° 15° W. Red 
clay. The sea being a little too heavy for a successful haul, the‘ Blake’ 
trawl came up with the net badly torn; it must have had too heavy a load 
of manganese nodules, as the part of the bag left contained about a plate- 
full of small, irregularly shaped nodules, incrusting also volcanic rock. . . . 
“ At Station 73 we lowered the trawl in 807 fathoms, lat. 17° 27’ S., 
long. 149° 32’ W. It brought up a mass of fine volcanic mud filled with 
sticks and leaves and decayed vegetation, fragments of rocks and other tel- 
luric material, pieces of sugar cane, and fragments of cocoanut shells. . . . 
“At Station 133 we lowered the trawl in 742 fathoms, lat. 18° 05’ S., 
long. 142° 23’ W... . The trawl came up in pieces; the pocket of the 
bag contained a piece of obsidian as large as a hen’s egg, a piece of pumice 
and of coral, both coated with manganese, a few fragments of wood simi- 
larly coated, a fragment of Tubipora, also coated, and a mass of Globigerinse 
connected by manganese, as well as volcanic fragments and particles of 
manganese. 
“ At Station 134, in 807 fathoms, lat. 18° 06’S., long. 142° 24’ W.... 
We sent the swabs down; brought up . . . some small manganese nodules 
and sharks’ teeth. .. . 
“ At Station 173, in 2440 fathoms, lat. 18° 55’ S., long. 146° 32’ W... . 
The ‘Blake’ trawl brought up about half a ton of flattened manganese 
