Which preposition to use with floatage

of Occurrences 1%

The raven would find sufficient for its carnivorous appetite in the floatage of the animal remains, on the briny flood, and would return to roost on the ark; but it was far different with Noah's bird, so long as the waters prevailed, there could be no pause for her weary wing, and the messenger would return to the ark.

Which preposition to use with  floatage