CHEMICAL DEPOSITS 



937 



hamas contain over 99 per cent CaCOs and only traces of MgCOs; i^ the 

 oolitic muds, however, MgCOg nsiially ranges from about 2.7 to about 3 

 per cent, this. larger percentage probably being due to the presence of 

 alcyon arian epicules and of foraminiferal shells and other organic tests 

 that contain MgCOg. The oolites, both those elevated and those sub- 

 marine, seem uniformly to contain a little CaS04, which, according to 

 Messrs. Johnston, Merwin, and Williamson, is probably necessary for the 

 formation of aragonite at ordinary sea temperatures. 



Chemical Analyses of Oolite and lyottom Samples from Florida and 'the Bahamas 



(By W. O. Wheeler) 



Oolite, 

 Boca 



Grande 



Key, 



Florida. 



Oolite, 



Oolite 



Ever- 

 glades, 

 Miami, 



Sharp 

 Point, 

 Andros 



Florida. 



Island. 



Bottom sample'^ 



(98), east side 



Marquesas 



Lagoon, 



Florida. 



Bottom sample^ 



(87), 1 mile 



west of west 



end of South 



Bight,Baliamas. 



Chemical Analyses 



SiC. 

 ALCv 

 Fe,0. 



p. ct. 

 0.03 

 .18 

 90 



MgO Trace. 



CaO 53.77 



Na^O 90 



K2O Trace. 



H2O 1.21 



CO2 42. .34 



P2O5 Trace. 



SO3 28 



01 1.02 



Soluble 



Total 



p. et. 



«8.23 

 .00 

 .21 



Trace. 

 51.60 



.11 

 Trace. 



.17 



40.11 



Trace. 



Trace. 



.08 



99.95 100.51 



p. ct. 

 0.07 

 .00 

 .13 



Trace. 



54.57 



.14 



Trace. 



1.72 



43.07 



Trace. 



.14 



.03 



99.87 



p. ct, 

 1.13 

 .14 



.21 (total 

 Fe) 

 1.31 

 51.04 



2.03 (and 

 organic ) 

 41.50 



"2.21 



99.57 



p. ct. 

 0.28 

 .03 



.11 (total 

 Fe) 

 1.25 

 52.30 



3.16 (and 

 organic ) 

 42.45 



99.58 



Eeduced analysis (hypothetical combination) ; H2O, organic matter, and soluble 

 salts rejected; silica not essential. 



SiO, 



(Al,Fe)203.... 



MgCOa 



CaCO^ 



Ca,PoOs 



.. 0.03 

 .42 



Trace. 

 .. 99.05 

 . . Trace. 



8.19 

 .21 

 Trace. 

 91.60 

 Trace. 

 Trace. 



0.07 



.13 



Trace. 



99.56 



Trace. 



.24 



1.18 

 .37 



2.88 

 95.57 



0.29 



.15 



2.72 



96.84 



CaSO, 



.50 





Total . . . 



.. 100.00 



100.00 



100.00 



100.00 



100.00 



"^ Samples washed and dried over H2SO4. 



8 Sample filtered, washed, and dried over H^SO^. 



» Twenty-five per cent soluble SiOg ; the rest of the silica appears to be white sand. 



10 Saline salts not washed out by water in the preparation of the sample. 



