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Does anyone know what fossil this is?

Hi there! I found this here in Central Ohio a few years ago. It's a fairly light rock. As you can see from the photos, it has a few different things going on with it (at least it seems they're separate but perhaps not?). I've searched quite a bit to try and figure out what this is. It appears to be the end of a tree branch or something but I can't seem to find anything that matches up with it so I'm hopeful you lovely people can assist! Thank you!

Found on Brighton Beach in England. Salt Water, cold. The whole stone is about 8cm across and main circular shape has about 3cm diameter. It looks like it goes through the stone which is what was confusing me. Thanks

My backyard has a large area where it's mainly rocky, meaning you can't really dig. Separating it from the "nice" grassy side of the yard is a hill. My daughter and I have found fossils there of bivalves and snails. I've attached some pictures of what I found today. But my question is regard to these tiny, circular, flat pieces that seem to cover the hill (first 3 pictures). I'm thinking they're a fossil of some kind, but I'm not sure. Can anyone help?

Found near Canelo, AZ. The grey stone feels brittle, lightweight, and gritty. And there's tons of it around. I'm not sure if this is a fossil or not. Just thought it looked real curious. What do you guys think?

Need help as I have tried to search with no results please. Found in East Feliciana Parish, Louisiana

Hi everyone. Interesting shapes on rock. Circular shapes both indented and extruding from rock. Found in Fairfield County CT. I'm pretty new to this and have no idea what this stuff is but interested to learn whether geologic or otherwise. Thank you.

Hi all! Yesterday I visited Formosa Reef here in Ontario (Amherstburg Formation, Lower Devonian), and I found these weird circular imprints on a few rocks - does anyone know what they are? @Kane Thanks a bunch! Monica photo with ruler for scale: close up photos:

Garage sale find in San Antonio, TX. 2 pieces, black circular shapes are slightly concave May or may not be from TX. Please help identify. Many thanks!

Does anyone have any clue what are embedded in this? I've never seen them before.

Hi, I found this large stone today in a local field in the West Midlands, what would the circular marks be caused by ?

Found on Myrtle Beach. No idea what it is or whether it's worth keeping! Ideas?

Dear colleagues I found this strange small thin disk on the surface of the sand in the desert in Giza, Egypt (just outside Cairo). It's very thin and has concentric lines, each line being made up of small dots. I can't find anything like it on various fossil sites that I looked at. It's only 2.5cm (one inch) in diameter and very thin. Many thanks to anyone who has the time to reply, even if it's just speculation (it's fun guessing too !)

Don't know what this is. Might be a shell

Mystery circular, ridge and groove fossil. This fossil is a slightly oblong to circular fossil ranging from 5mm in diameter to 12mm in diameter. It is composed of a series of ridges and grooves radiating from the center to the edges. At the center, the ridges do not connect to a central point (at least in no example that I’ve found). Very few examples show the central feature, but in the best preserved of them, which appears to be complete (see photo) there is very small central circular depression and the radial ridges and groves terminate at the rim of the depression. That example may also show remnants of a stem fragment or other object in the central depression, but it is not clear. From the better preserved specimens it is easy to see that the fossils in question are three dimensional, rising from flat rock surface at the edge to the raised central depression. However, most examples are missing the top third or half of the specimen (see second photo). In those cases, the fossil presents as a narrow ring of grooves and ridges with a large flat top and no obvious internal structure. The number of ridges varies from 35 or so to over 60, but they are hard to count because what starts out as a single ridge at the top (near the depression) sometimes branches into 2 ridges at the bottom near the edge. All of the specimens that I’ve found seem to be flat and secure to the rock on the bottom. I haven’t tried to separate it from the rock to see if there are any details underneath. These are common fossils at a site in Hedgesville, WV. Jasper Burns, in his book Fossil Collecting in the Mid-Atlantic States, dates these rocks to the Devonian, specifically the Mahantango formation which I understand was laid down about 392 and 385mya. In the same rocks, I’ve found plentiful shell fossils of numerous species that I haven’t identified yet, including, in one instance, a very small shell fossil trace embedded on the mystery fossil above. Burns’s book doesn’t appear to discuss this fossil in his chapter on the same locality, and I haven’t had any success even using Index Fossils of North America. From some photos online, my best guess is that it may be a crinoid segment, although they all seem to lay perfectly flat, and I wonder if it may be a holdfast of some sort. Any help would be appreciated. Thanks, Alex

Hi everyone, I Stumble upon this during a rainy season, its a hilly region in the east of India. It weight almost like a stone, colored like a metallic rust and this looks like a walnut to me(but never this big size) . So if you guys got any clue Please help me out.

I need help identifying this donut / rollerskate wheel shaped fossil embedded in rock. I do not know for sure the type of rock, but could be limestone. Size is approx. 3.5 inches across. Any tips are appreciated. Thanks.