74 
PACIFIC SCIENCE, Vol. XII, January, 1958 
Fig. 1 . Spherules from Core 90, 
be practically the same. The carbonate con- 
tent was, however, much higher in the upper- 
most part of Core 90 B, viz., 56 per cent as 
compared with the corresponding 0-6.5 cm. 
of Core 90. 
CORE 92. This core, raised from a depth 
of nearly 4,000 metres close to the Equator, 
is also one of large diameter (90 mm.) with 
a length of only 5 metres. The sediment is a 
calcareous ooze, its content of CaCOs varying 
between 71 and 82 per cent. The uppermost 
64 cm. of the core were missing, having been 
lost in transport. The rate of sedimentation 
can only be tentatively estimated at 50 mm. 
in 1,000 years. 
The number of spherules extracted was 
very low. Recalculated to 1 kg. of lime- and 
salt-free sediment, the numbers varied from 
0 in a depth of 201-217 cm. to slightly over 
about 30 to 60 microns in diameter. 
200 between 64-81 cm., 231-248 cm. and 
275-293 cm. The average for the whole core 
was 80 spherules per kg. of sediment. (See 
diagram in Figure 6.) 
core 133. This core, the only thick core 
(90 mm.) raised from the central part of the 
Indian Ocean at a depth of 5,200 m., had a 
total length of 326 cm., from which the up- 
permost 3 cm. were missing. Down to a depth 
of 200 cm. below the top of the core it had a 
moderately high content of CaCOs, between 
14 and 40 per cent, whereas in the lower parts 
of the core the lime content was only between 
5 and 10 per cent, especially near the lower 
end where it varied over 45 cm. between 5 
and 5.6 per cent. The number of cosmic 
spherules extracted from the uppermost 3-18 
cm. was high, viz., nearly 700 per kg., whereas 
in the lower parts, at depths between 50 and 
