 Thinner layers of beachrock underlying the primary bed of beachrock were also broken up as the loose sediments enclosing them and the thicker primary bed were eroded.As the loose sediment was scoured out from under the blocks and other pieces of beachrock by so-called "scour and settling processes", they dropped downward for several meters until they rested directly on the erosion-resistant Pleistocene limestone as an erosional lag.Eugene Shinn discusses a similar, but not identical, process by which the Bimini Road could have been created.