BOTTOM SAMPLES, MURRAY ISLAND, THE BAHAMAS, AND FLORIDA. 263 



b 



(5) Oolitic sand from Great Bahama Bank, between Gun Cay Light and Northwest Passage, 



water about 9 feet deep. Sample No. 71, see plate 95. 



(6) Globigerina ooze from depths of 825 fathoms (sample 84), and 800 to 820 fathoms 



(sample 85), see plate 95. 



(7) Oolitic rock, from {a) Sharp Rock Point, Andres Island, marine-bedded oolite; 



{b) Queen's Stairway, Nassau, wind-blown oolite; {c) north ridge of Seven Hills, 

 New Providence Island, wind-blown oolite. 



SAMPLES FROM BEHIND THE REEF OFF COCOANUT POINT, EAST SIDE 



OF ANDROS ISLAND. 

 (Bottom samples 190-193; for precise location see fig. 3.) 



Figure 3 shows the general relations of reefs to depths and kind of 

 bottom. The country rock is oolite. The bottom material is composed 

 mostly of calcareous algae, foraminifera, fragments of madreporarian corals, 

 alcyonarian spicules, and mollusk fragments. There are also some cocco- 

 lithophoridae, sponge spicules, echinoid fragments, and grains derived from 

 the oolite which is exposed along shore and extends under sea. Polytrema 

 and crustaceous calcareous algae {Lithothamnion amulans Foslie and Howe) 

 are abundant here, as in Murray Islands. Goniolithon stricHim Foslie is 

 common in areas of quieter water. 



The following are the results of mechanical analyses of the samples: 



Mechanical analyses of bottom samples Nos. igo to igj, from the Bahamas.^ 

 [Graphic illustrations of the results of these analyses, plate 94.] 



'By the U. S. Bureau of Soils. 



The following is a chemical analysis of a composite sample of all four 

 samples, made by taking equal portions of each of the four and mixing them: 



Chemical analysis of composite of samples igo to igj from behind 



reef off Cocoanut Point, Andros Island. 



(By Alfred A. Chambers.) 



