The strontium-calcium atom ratio in carbonate-secreting marine organisms 



37 



Table II. — The occurrence of calcium and strontium in substances other than 



marine organisms 



Localilv 



Carbon Organic Atom ratio 

 Calcium Strontium dioxide matter ' Sr 



Ca 



X 1000 



* Specimen was provided by Mr. Taivo Laevastu. 

 t Specimen was provided by Dr. Howard R. Gould. 



Table III. — Summary of results arranged in accordance with the phylogenetic 



classification of marine organisms 



