BOTTOM SAMPLES, MURRAY ISLAND, THE BAHAMAS, AND FLORIDA. 257 



Silt (sample No. 2/'j^ja). — Of the larger fragments very many are 

 foraminifera; coccolithophoridae (Pontosphcera) are fairly frequent; spicules 

 are scarce and are mainly siliceous. 



Clay (sample No. 2yj^ja). — Coccoliths are extremely rare. There are 

 flakes with needle-shaped or lath-shaped, highly birefringent inclusions. 

 These inclusions, according to Dr. H. E. Merwin, of the Geophysical Labora- 



Analyses of sample No. 27337, ^"^^ h 200 feet from shore. 



1. Fine Gravel. 



Algae 



Corals 



Mollusks 



Tinoporus 



Amphistegina 



Orbitolites 



Total 



2. Coarse Sand. 



Algae 



Corals 



Mollusks 



Tinoporus 



Amphistegina 



Orbitolites 



Foraminifera (undif- 

 ferentiated) 



Crustacea 



Worm-tubes 



Total 



3. Medium Sand. 



Algae 



Corals 



Mollusks 



Foraminifera (undif- 

 ferentiated) 



Orbitolites 



Worm-tube 



Total 



4. Fine Sand. 



Algae 



Corals 



Mollusks 



Foraminifera 



Balanus 



Total 



5. Very Fine Sand. 



Algae 



Corals 



Mollusks 



Total 



No. of 



grains 



present. 



39 

 31 

 29 



5 

 4 



z 



56 



58 



20 



2 



I 



144 



II 



20 

 5 



39 



21 



20 



9 

 2 

 I 



S3 



6 

 II 



2 



19 



Cal- 

 culated 

 weight. 



gm. 

 0.0569 

 .0383 

 .0392 

 .0049 

 .0029 

 .0010 



Weight 



per- 

 centage. 



.1432 



0.0195 

 .0135 

 .0034 

 .0004 

 .0001 

 .0003 

 .0006 



.0004 

 .0001 



.0383 



wt. untts. 



1,595 



2,600 



650 



100 



130 

 60 



S.I3S 



3,04s 



2,600 



1,170 



200 



170 



7,185 



870 



1,430 

 260 



2,560 



39-75 



26.75 



27.40 



3.40 



2.00 



■70 



100.00 



1.05 

 ■25 



31.05 



50-65 

 12.65 



1-95 



2-S5 

 1. 15 



42.40 



36.20 



16.30 



2.7s 



2-35 



100.00 



34.00 



5S-8S 

 10.15 



100.00 



Calculated 

 percentage composition. 



CaCOa MgCOa CaSO, CaaPjO, 



35.60 

 26.55 

 27.30 



3 -OS 

 1 .90 



-65 



95-05 



93.80 



27.80 



50-30 



12.60 



1-75 



2.30 

 1.05 



95.80 



37-95 



35-95 



16.25 



2.45 



2.30 



94-95 



30.45 

 55-45 

 10. 15 



3-85 

 .20 

 10 



35 

 10 



05 



4-65 



4-95 



•25 



Tr. 



. 10 

 -IS 



-15 



Tr. 



5-75 



3.00 

 -35 

 -05 

 .20 



-25 

 .10 



3-95 



4-iS 



-25 



-OS 

 ■30 

 •05 



4-7S 



96.05 



3-30 

 -40 

 Tr. 



3,70 



0.30 



.30 



0-35 



Tr. 



•35 



0.25 



•25 



0.30 



■30 



.60 



0.25 



-25 



o.io 

 Tr. 



Tr. 



Tr. 



