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How could a flood have deposited chalk?

April 26, 2017chalk deposited flood

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How could a flood have deposited chalk?

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Chalk is largely made up of the bodies of plankton 700 to 1000 angstroms in diameter [Bignot, 1985]. Objects this small settle at a rate of .0000154 mm/sec. [Twenhofel, 1961] In a year of the Flood, they could have settled about half a meter.