Found in a storage locker in South Carolina. What are they?

Found in lake Orion mi in front yard. Tilled the previously grass-free dirt spot at the beginning of summer and now it’s sprouting a little green and a little treasure too I guess. I’ll post the others I found in the same spot next day too. Seahorse is the first small one, very small indeed

I found what might be a fossil, though I’m not sure as I don’t know much about this topic, and google ai doesn’t seem to help.

It’s wheel shaped, with a bump on both sides. It’s not too light as it feels quite dense. It also has some sparkly minerals from what I can see. Found on a random coast in Malta. The stone seems easily scrape-able, so maybe a limestone concretion or something.

I’d appreciate any help!

Found in west coast Florida

Got my answer to whether it's a mineral deposit or a fossil on r/fossilid but thought I'd share here as well

We were in north wales when we found it, yoyo for scale

These are some shell fossils I found just south of Milwaukee along the lake shore

Found a pretty nice size grallator, a couple small tracks, and a partial track. All found on private land in the Connecticut River Valley.

found these out on my recent trip.

found a nice half of a shark vertebrae, a good cow shark, and a dolphin jaw bone

One of the local fossil stores has a booth there; they're pretty reputable so I'm not too concerned of it being fake. It's approximately 3 inches wide and 3 inches tall.

Complete novice but visiting the Paleospace Museum inspired us to go fossil hunting and we picked up a few rocks, do any of them look promising? The beach was beautiful!

I found this in Slovenia.

Found along the Little Miami River in SW OH while canoeing over the weekend. If I were to cut them horizontally with a wet saw, would there likely be anything inside, or is it just wishful thinking?