#fossil identification

Im currently out in the woods for rock and fossils. Just visited this rocky boulder pile with many medium sized flints. Found an mussel!!

Is this a fossil? Found on the side of a road on a walk. There is a river nearby. I’m not sure if it is or not. Circled it to show what I’m talking about. It has small groove lines that curve, reminds me of a shell. Tried to clean it to see it better but it’s the best I got.

I also didn’t find any other markings similar on this rock.

Could be wrong but thought I’d ask for opinions 🙇

is there anyone out there with some premium fossil/geology autism who can save me from asking reddit about my cool rocks? i don't know what any of these are...

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I’ve been yapping with my mutual about this for ages and need to finally play catch up. Some things may appear twice (as in they showed up in the last post) because I’ve reorganized how I’m holding these.

@thebrokenmechanicalpencil- I’m sharing finally.

But! I’ve had a good few days hunting. Im going to need to split what I have into a couple posts.

We have some sharks teeth and various shells.

These are the same things. One has my quarter for comparison the other has actual photo quality. But sea robin skulls. Specifically the… Neuro something or whatever. Brain plate.

We have ray and pufferfish mouth plates and some vertebrae. The first two are fragments but that last small one is whole! It was a really cool find!

i was on a coastal trip in kent last week and visited multiple beaches. these items i found in folkestone, all around the same rockpool area.

at first i thought the biggest piece might be something like a scallop shell trace fossil but then i found the others which have these ridges intact that seem to deep for any shell that i know by name??

then i thought maybe it's some mammalian teeth because of the general shape of some of these but because of how prominent the ridges are that seems unlikely.

it might be something entirely else and i just have no idea but it's definitely something.

I know it’s a bit of a random post, but I’ve really been wanting to have these (and other rocks I have) identified somehow. I’ve had these both for years and I’ve always wondered what they were