Quote Originally Posted by loogie View Post
first... i'd mention that in geology standards, 4000 years is a pretty small measure, so the erosion over that time would probably be all but nothing. for significant noticeable erosion, you'd be talking millions or billions of years, not thousands.
Actually, when discussing karst topography, lots of erosion can happen in 4000 years. You'd start with sinkholes (think central Florida for an example), which would then evolve into connected canyons sunk into a flat karst block (kind of like the area around Mammoth Cave in Kentucky).
And limestone doesn't have to come from a coral reef. Much of the world's limestone originally comes from shells deposited on the seabed.