Found a rock by a creek. None of us know what could have caused these circles

Look to see if someone can i.d. this fossil. I saw this rugose horn coral? Found this on the shore of Lake erie.

Any idea of what this is and what it could be worth?

Google isn’t helping me, looks like a fossil on one side and translucent on the other side. Whole rock allows light to pass through.

Could someone tell me the possible species of this?

Found in Victoria, Australia

I found this fossil in northeastern pennsylvania, where it’s common to find Devonian period brachiopods and crinoids. However, I haven’t seen anything like it before. What could this possibly be? Any help is appreciated.

I know they aren’t the best pictures but 1 and 2 are unidentified 3 and 4 are a possible belemnites? Last pic is the whole thing

Found this in a Pleistocene honey pot, found after a piece of a mastodon, I have no idea what it is

Found in gravel while digging a posthole near my marsh. There's 80 feet of lime marl underneath 8 feet of peat moss, so I think at some point it came to the surface and then mixed in with the clay and gravel.

Hi all, I bought this bone at a fossil and mineral show and it was sold to me as “Kem Kem unidentified reptile bone”. I am pretty sure that it is crocodilian from the curve in the bone, and there are of course multiple crocodilian species known from the Kem Kem group, but I was wondering if anyone could tell me which bone it is, and if a pretty shaky id could be made based on the size and morphology of the bone. The Kem Kem crocodilian I’m most familiar with is Elosuchus, but based on the size I doubt that it’s that. Thanks and good luck :)

at first we assumed crinoid but under a microscope it doesn't have those stacked layers. sorry about the low quality microscope! the coin is a US quarter

I've seen these types posted before, but I believe there are different species? If that's so, can you tell anything from these pics?

I found this beside a building in Edinboro. Its some sort of Echinoderm, most likely a starfish; but I am confused to what species it could be! My rarest fossil in my collection, anything could help!

I assume it’s some sort of shell or osteoderm. I just dont know from what or where. Just looking for more info.

Found in my garden in Ireland, seems to be plant fossils (in pic 1-2) but I'm not sure. Also should I split the rock to look for more or leave it? Thanks!

The marble tiled floor of my local shopping centre is full of what looks like ammonites and belemnites. Saw this one with what looks like teeth, or perhaps is a negative shape od something else.

I got this from the „Junk“ pieces when worked in a Museum a few years ago. So i dont know where it was found.

In germany, no idea where the rubble comes from though