940 



T. W. VAUGHAN CHEMICAL DEPOSITS OF THE SEA 



Chemical Analyses of Foraminifera important as Contributors to Deposits in 



Coral-reef Areas 



(1) Tinoporus hacnlatus (Montfort) Carpenter, from Murray Island. 



(2) Polytrenia mineaceiim (Linn.), from Cocoaniit Point. Anclros Island. 



Bahamas. 



(3) OrhicKlina adunca (Ficlitel and Moll), from Key West, Florida. 



(4) Orhitoliies marfjinaUs (Lam.), from sontli of Tortn.scas, depth 17 fathoms. 



(5) Qninqueloculina aiiheriana d'Orbigny, from south of Tortugas, depth 17 



fathoms. 



Analyses of 1, 2, 3, 4 hy W. C. Wheeler ; of 5 by Alfred A. Chambers 

 Chemical analyses of foraminifera 





(1) 

 Tinoporus. 



(2) 

 Polytrema. 



(3) 

 Orbiculina. 



(4) 

 Grbitolites. 



(5) 

 Quinque- 

 loculina. 



SiO.o 



(Al, Fe),03.. 



MgO 



CaO 



P2O. 



Ignition '-. . . 



0.03 



.18 



5.03 



27.35 



.00 

 46.57 



1 '■'' 1 



5.09 

 47.35 



(?) 

 46.24 



0.11 



.09 



4.64 



48.79 



Trace. 



45.56 



0.30 

 .13 



4.93 

 48.92 

 Trace, 

 45.20 



1 0.54 



4.32 

 49.02 



(?) 

 45.54 



Total... 



99.16 



98.70 



99.09 



99.48 



98.42 



Reduced analyses (hypothetical combinations) 



SiO, 



(Al, Fe)oO 

 MgCOs.... 

 CaCO,.... 

 Cii.,FoO,... 



Total . 



0.03 

 .19 



11.08 



88.70 

 .00 



100.00 

 INTurray Id. 



0.02 



11.22 



88.76 

 (?) 



100.00 

 Bahamas. 



0.11 



.09 



10.04 



89.76 



Trace. 



0.31 



.13 



10.55 



89.01 



Trace. 



100.00 100.00 



\ 



Key West, i Tortugas. 



0.56 



9.33 

 90.11 



(?) 



100.00 

 Tortugas. 



Doctor Goldman undertook at my request a study of two bottom sam- 

 ples from Murray Island, Australia, and endeavored to correlate the 

 chemical composition of each sample as deduced from the organic remains 

 composing- it with the chemical composition of the entire sample as deter- 

 mined bv actual analysis. 



- Equals organic matter + CO, + H,0. 



