#6 looks like a very worn ichty vert
#7 is a modern small herbivore mammal tooth not a fossil
#8 completely pyritised echyoceras (or something similar)
#6 is appears to be pyritised and is surprisingly heavy, so I was assuming the probability of it being bone was very low.
#7 yes, I was coming to that conclusion 👍
#8 interesting. There's trace pyrite crystals on the surface, but it superficially appears to be mudstone with no evidence of the external structures you'd expect to see somewhere. That said, it's got exactly the kind of profile you'd expect to find in a largely pancaked ammonite with the preserved body chamber.
I don't have access to the kind of tools that would let me strip away the matrix. Any suggestions on prepping?