Estimated abundance of phosphate (expressed as metric tons P2O5) in phosphate deposits throughout the Phanerozoic. The fixed time interval in the histogram is 25 Myr. It should be noted that a logarithmic scale is used for P2O5 abundance (). At the right margin, there is a list of the large Phanerozoic marine manganese deposits (). The numbers identify the following deposits: 1, Nikopol, Ukraine; 2, Chiatura, Georgia; 3, Groote Eylandt, Australia; 4, Molango, Mexico; 5, Úrkút, Hungary; 6, Taojiang, China.