i think you somewhat underestimate satellite mapping, if there were any floating ocean forest remnants presuming it to be true, then by now one should have been spotted because unless it was anchored to the sea bed then it would migrate to about the same places where trash in the ocean congregates, thing is from mapping the ocean currents we do infact know where those places are and where they are likely to form, also consider that still assuming such once existed, it would have to be freshwater upon which they floated, because very few plants do well near ocean sprays(beaches) palm trees are pretty tough plants and as such do just fine on beaches and in deserts, interestingly they do not do well in the bush(zimbabwe bush land, they do fine in the wet parts(in cities an towns, because such are built by and on rivers and former swampland, because building a town in the middle of the bush is just plain stupid) but i to date havent seen a single one outside of a town or city, not even in matopos which can be quite wet, and is fun to hike through)
but back to seriousness, i dont know of anything that would suggest we have any floating forests, but if they were once a thing they cannot exist in the world as it is to day what with salty oceans (assuming whatever passed for seas if any before werent salty or as salty, only God knoweth that for certain and he hasnt told us much about such things, so clearly they are not important enough for him to mention in his word)
also hurricanes, turbulent oceans even a forest that could survive the salt i would not expect to survive the weather of this present world and still drift about without making landfall and dying off because of the dry sand.
