ID Help with Douglas Point Finds

[Snaggletooth19]

I just took a trip to Douglas Point, MD (Paleocene, Aquia Formation). I found two great Otodus teethwhich is a first for me in several trips, actually (you can see them in the first image along with some other shark teeth). There are a few other items I found that I could use some help with ID on.

 

For #1, I know it's a crocodile tooth, but what genus/species would it be from this formation?

#2 I'm thinking might be turtle shell or plastron?

#3 I believe would be reptile bone. Is it possible to be more specific what bone it is based on its shape?

#4 Could this also be some piece of turtle shell?

#5 I can see enamel in two areas on this piece. I can't tell if this is just a very deteriorated shark tooth or another fossil entirely.

#6 I'm not certain if this fossil or concretion. If a fossil, it looks close to resembling part of an osteoderm?

 

Thanks for any help on these and happy hunting.

 

Chris

[shark57]

2 is a partial stingray mouth plate with several fused but broken teeth. 3 looks like a piece of turtle.

4 looks like a mouth plate from the fish Paralbula.

5 is a fragment of an Otodus with one cusplet and a small piece of the crown.

 

Try brightening your pictures before uploading them. It will help in getting them identified.

[Snaggletooth19]

Thanks! I considered ray plate but it didn't have any of the characteristic ridges. 

Can anyone confirm if the croc tooth is likely to be Eosuchus minor?

Any thoughts on 6?