Wouldn't all the preserved stuff be directly at the bottom, though? So the only change to preserving would be in places where the bottom is 90-150m, and the onl

Wouldn't all the preserved stuff be directly at the bottom, though? So the only change to preserving would be in places where the bottom is 90-150m, and the only stuff it would apply to is whatever sank after the level changed to 90m, so it can't be a lot or very interesting.