Sediment Transport and the Coconino Sandstone: A Reality Check on Flood Geology

by Timothy K. Helble

The origin of a graphical procedure developed by a prominent Flood geologist to estimate the water depth and current speed associated with deposition of cross-bedded sandstones during a global Flood is examined. It is shown how this graphical pro- cedure was used to estimate a widely quoted depth and speed of Flood waters said to be responsible for depositing the Coconino Sandstone and other Grand Canyon sandstones in a matter of days. Simple calculations are then performed to show that sediment transport rates much greater than anything reasonably associated with this estimated water depth and current speed would still be grossly insufficient to deposit the Coconino in a matter of days.

PSCF 63, no. 1 (2011): 25–41

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