Odd, that Noah's flood neither destroyed it nor deposited thick sediments on top of it!
Jennifer Hillam of the University of Sheffield and Mike Baillie of Queen's University of Belfast and their colleagues were able to date the walkway by a second method, i.e., treering dating.
Dating various portions of a sample is another kind of check that may be performed. Samples from top to bottom of a peat bog gave reasonable time intervals (Science, vol.200, p.11).
The calibrated C-14 method confirmed Egyptian records, and most of the Aegean dates which were crossdated with Egyptian dates were confirmed (American Scientist, May June 1982).
On page 1346 the author explains some of the professional care which stands behind his use of the carbon-14 method.