[dangus]

<<The above is just an illustration of the fact that your experiment is making a lot of assumptions. <<

Yes, but those assupmtions are consistent with creationism. The sandstone must have been MADE hard, since it takes a heck of a lot longer than a couple thouand years to turn sand into sandstone. And if the feature was made by the ordinary receeding of water, we actually could guess how much water. Here's a hint: not much. You'd have a few month's worth of erosion, and not at a very fast rate. Actually, one other poster posted the real kicker: Geological upheaval has gone on since the erosion started: The water would have to had run UPHILL early on in the process.

[Hunble]

Geological upheaval has gone on since the erosion started: The water would have to had run UPHILL early on in the process.

Think about it.........