The amount of Sr in Recent carbonate sediments increases from the Pleistocene reef area of the Florida Keys to the living reef area on the E. The maximum values for Sr contents are reached about one nautical mi. on the leeward side of the living reef, and there is a gradual decrease closer to the living reef and seaward from it. Within the same sediments the Mg content decreases as the Sr content increases and reaches a maximum where the Sr content reaches a minimum. The high Sr-low Mg content and the low Sr-high Mg content are related to the mineralogical nature of the organic remains composing the sediments.

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