Detailed chemical analyses of marine halite rock ranging in age from Cambrian to Holocene are compared. If evaporite deposits reflect the geologic history of sea water, then a similar composition of rock salt of differing ages suggests that the ratio between ions in sea water has remained approximately constant since Cambrian time. Certain elements, such as strontium and boron, are depleted in marine halite rock because they are deposited respectively earlier and later in the evaporation sequence. Lead is enriched a thousandfold, possibly because of heavy-metal concentration by microorganisms.

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