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



Silt (sample No. 27353a). — Of the larger fragments very many are 

 foraminifera; coccolithophoridae (Pontosphara) are fairly frequent; spicules 

 are scarce and are mainly siliceous. 



Clay (sample No. 27353a).— 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, Ivm I, 200 feet from shore. 



1. Fine Gravel. 



Alga: 



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. 



Alga: 



Corals 



Mollusks 



Foraminifera (undif- 

 ferentiated) 



Orbitolites 



Worm-tube 



Total . 



4. Fine Sand. 



Alga: 



Corals 



Mollusks 



Foraminifera 



Balanus 



Total . 



5. Very Fine Sand. 



Algae 



Corals 



Mollusks 



Total . 



No. of 



grains 



present. 



39 

 31 

 29 



S 

 4 



2 



Cal- 

 culated 

 weight. 



gm. 

 0.0569 

 .0383 

 .0392 

 .0049 

 .0029 

 .0010 



56 



58 



20 



2 



I 



I 



3 



2 

 1 



.1432 



0.0195 

 .0135 

 .0034 



.0004 

 .0001 

 .0003 

 .0006 



.0004 

 .0001 



Weight 



per- 

 centage. 



39-75 

 75 



26 



27 



3 



2 



Calculated 

 percentage composition. 



CaC0 3 MgC0 3 CaSO, Ca,P 2 0, 



39 



21 

 20 



9 



2 

 1 



53 



6 

 11 



2 



"9 



130 

 60 



5,135 



3,045 

 2,600 



1,170 



200 

 170 



7,185 



870 



1,43° 

 26b 



2,560 



95 05 



60 

 00 

 •85 

 ■95 

 •25 

 •70 

 .40 



.80 

 •25 



J 85 



.20 

 . 10 



•35 

 . 10 



•05 



2-55 

 1. 15 



100.00 



42.40 

 36.20 

 16.30 



2-75 

 2.35 



100.00 



34.00 

 55.85 

 10. 15 



4.65 



4 95 

 ■25 

 ■05 

 . 10 



Tr. 

 . 10 

 •15 



«5 

 Tr. 



0.30 



.30 



0-35 



Tr. 



2.30 

 i. 05 



95.80 



•95 

 ■95 

 ■25 

 •45 

 •30 



94-95 



30.45 

 55-45 

 10. 15 



96.05 



.25 

 .10 



3 95 



i 15 

 •25 

 •05 

 .30 



•05 



4-75 



3.30 

 .40 

 Tr. 



3.70 



•25 



0.30 



•30 



.60 



0.25 



•25 



o. 10 

 Tr. 



Tr. 



Tr. 



