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A good many pelagic foraminifera and their fragments.
Coccoliths and rhabdoliths.
No. 9.— Station 12. March 3rd. Lat. 21° 57' N. ; Long.
43° 29' W. Depth, 2,025 fathoms. Bottom temperature, 1°'9 C.
Chemical composition
Loss on ignition after d rjin g at 230“ F ..................................................... 8 ‘80
A l u m i n a ................. ....................................................................... 19-24
Ferric o x id e ............................. ...................................................................... 13-74
Calcium phosphate .....................................Fair traces.
Calcium s u l p h a t e ............................................................................ 1-37
Calcium c a rb o n a te ................................................................................43-93
Magnesium carbonate . . 1-94
General residue, consisting of soluble silica -with the insoluble
s i l i c a t e s .................. ...................................................................... 10-98
100-00
A ‘ globigerina-ooze ’ containing many pelagic foraminifera
of the genera Olohigerina, Orbulina, Pulvinulina, Sphoeroidina,
and Pullenia. Many coccoliths and rhabdoliths.
Mnch amorphous clayey matter, tvith iron and manganese
peroxides.
No. 10.—Station 13. March 4th. Lat. 21° 38' N. ; Long.
44° 39' W. Depth, 1,900 fathoms. Bottom temperature, 1°‘9 C.
Chemical composition :—
Loss on ignition after drying at 230“ F ..............................................
......................................... 6-63
Alumina .............................................................................
........................................... I 5-86
Ferric o x i d e ..............................................................................................
Calcium p h o sp h a te ..................................................................................Small traces.
Calcium s u l p h a t e ......................................................................................... 0-51
C a lc ium c a rb o n a te ................................................................................................ 74-50
Magnesium c a rb o n a te ...................................................................... 1-27
General residue, consisting of soluble silica with the insoluble
s i l i c a t e s .............................................................................................................11-23
100-00
A ‘ globigerina-ooze ’ containing many pelagic foraminifera of
the genera Globigerina, Hartigerina, Pulvinidina, Sphoeroidina,
and Orbulina. Many coccoliths and rhabdoliths. A fe-w pteropod
shells and valves of Ostracoda and otolites of fishes.
Amorphous clayey matter and small mineral particles—mica,
quartz, olivine, felspar, and pumice. Some of the particles of
quartz -were rounded as if vand-blo-wn.
No. 11.— Station 14. March 5th. Lat 21° 1' N .; Long.
46° 29' W. Depth, 1,950 fathoms. Bottom temperature, l°-8 C.
Chemical composition:—
Loss on ignition afte r drying a t 230° F. .
Alumina . . . .
Ferric oxide .
Calcium phosphate .
Calcium sulpliate
Calcium carbonate .
Magnesium carbonate
Sihca ........................
Portion soluble in
hydrochloric acid
= 90-82.
Portion insoluble
in hydrochloric
acid = 4-60.
Insoluble residue, principally alumina and
ferric oxide, with s i l i c a ..............................
4-58
3-33
1-12
1-20
79-17
1-40
4-60
4-60
100-00
A reddish ‘ globigerina-ooze ’ containing many pelagic foraminifera
of the usual genera, and many coccoliths and rhabdoliths.
Amorphous clayey matter with oxide of iron. Many small
particles of sanidine, augite, hornblende, and magnetite.
No. 12.—Station 15. March 6th. Lat. 20° 49' N. ; Long.
48° 45' W. Depth, 2,325 fathoms. Bottom temperature, 1°'7 C.
Chemical composition :—
Loss on ignition afte r drying- at 230° F ...................... ....................... 4-17
f A l u m i n a ...................................
Ferric o x i d e ............................. ........................1 6-25
Portion soluble in Calcium phosphate . . . . . . Large traces.
hydrochloric acid ' Calcium sulphate . . . . ........................ 1-91
= 87-50. Calcium carbonate . . . . ........................67-60
Magnesium carbonate . ....................... 2-58
S i h c a .........................................
Portion insoluble
in hydrochloric , Insoluble residue, principally alumina and
acid = 8-33. ] ferric oxide, with silica ........................ 8-33
100-00