Yeah, it can be hard to know what's happened to fossils that are exposed like that, unless you can see unmistakable evidence that someone's been there. Most likely, it's just crumbled away and/or been interfered with by animals.
I like the footprints. Yeah, if I remember correctly there's a bit of a controversy about how old they might be. More study!!!!.
Looks like several individuals are there...unless it's just one person doing a tap dance!!!!:):):P:P
Yep, many of the bivalve genera that are present in those fossil beds are still extant. Same with the other molluscs there.