The relations between phosphorite reserves, the mass of phosphorus in the sedimentary rocks, the rates of phosphorus accumulation in the sediments of the World's ocean, sea-level changes, climatic oscillations, and the fluctuations in the carbon isotopic composition (indicating biological productivity) are assessed over the time interval from the Early Jurassic to the Holocene. A kind of dependence is established between all these parameaaters: climate warming and sea-level rise correlate with a growth in the biological productivity of the ocean, an increase in the rates of accumulation of disseminated phosphorous in the ocean sediments and sedimentary rocks of marine origin over the continents. They stimulate the processes of phosphorite deposite formation.
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