Thank you for your responses -
appears to be disintigrating from UV exposure
Yes and no - lots of that wear is from where the oars have rubbed against the boat. It's by no means in a perfect shape, but does hold air and is fun for day trips.
The tear is not a great picture, but is just something from sharp rocks, the crap around it is residue from an aquaseal 'repair' - you can see how that worked.
Legacy was a thin "hypalon" material.
Yes, it is thin! Feels like a paper bag when compared to the quality, heavy Avon, but hey, it holds air.
Which glue would be best to use to patch the floor?
I believe a drifter, it's a 12.5 ft bucket boat