There's some geologic evidence for a rapid filling of the Black Sea via the Bosporus in the early Holocene. Megafloods have also occurred such as the ones that created the Channeled Scablands of the NW USA. Large amounts of coastal land such as Doggerland and Beringia were also submerged as sea levels rose after the last termination. Of course none of this is evidence for the Biblical Flood any more than dating an eruption of Santorini to the time of the Sea Peoples is evidence for the existence of Plato's Atlantis. The stories themselves are myths--explanatory narratives meant to communicate cultural values. Myths by their nature can't be proved since they trade in moral concepts as opposed to material truth. So, lots of geologic evidence for megafloods and rising sea levels, no evidence for a forty day global flood as described in Genesis.

>>"if there is a shred of it anyone knows about, i'd like to hear it."<<

I have a Master's degree in geology/sedimentology and have worked in the oil industry as a geologist for over thirty years. In my experience there is no sedimentary record of a global flood, as described in the bible. I do not not believe that if there had been such a flood there would necessarily be any record of it. Simply covering the earth with water is not likely to erode or transport very much sediment in one year's time. The strongest signal might be a layer of mud stirred up and settled out all over the planet, but this is likely to be thin and quite likely to be reworked by sedimentary processes after the flood ended. The same would be true for any coarser grained deposits. Hurricanes can stir up lots of sediment and move and deposit a lot, but longer term coastal processes will rework all this and over time any evidences of hurricanes tend to disappear or blend in with the sediments formed by hurricanes. The same would be true of a global flood. Young Earth Creationists have created something they call flood geology which essentially attempts to explain all sedimentary deposits as the result of Noah's flood. This is probably the most absurd set of ideas ever conceived, as there are no geologic deposits that fit the global flood model and the vast array of different sedimentary deposits we know about cannot be explained in even the remotest way by these models.