My 6yr old son found this in a flit in school today. He very interested in what it can be?

I posted this a few days ago, but I was asked for more pics!

This was found on my grandparents property in Callaway County, Missouri near the Ameren Nuclear Plant. I’ve seen marine fossils in this area my entire life, but NEVER have I seen one like this.

I’d love to hear what you think!

So, as the title says she found this is Marine City Michigan. She is swearing up and down its Nordic Writing. I believe this is simply fossils, anyone know if these are in fact fossils? Pieces of fossilized fern? Roots? Grass? Any help is appreciated. Thanks folks!

Round 2: I completely forgot to add photos….

Thought this was rebar until I realized that this is a rock and not a chunk of concrete. Is this some sort of fossil, or just some iron deposit vein?

Found this along a river in northern MN on Canadian border. I thought we didn’t have fossils here??

This interesting but somewhat vaguely defined fossil was obtained via auction, so its geographic origin is unknown. There clearly are circular fossils resembling crinoids on both left and right sides, but I’m curious about the branching structures. At its widest point, the piece measures about 10 cm. Dry on the left, wet on the right. Any ideas what we’re looking at here? Thanks.

Found this petrified wood and the bark inprint looks cool. Wondering if anyone can use this to determine the specific species.

Found in eastern kentucky inside what was probably some coral.

Last photo is an inprint I found in a rock I thought y'all would like.

Found while exploring some rock formations today - including a pic of the rock formation itself as well as some close ups of different interesting things - especially curious what the fossil with circular markings might be?

I didn’t notice this fossil before putting the rock into the Tumbler, but there is a chance I missed it. I am in Southwest Pennsylvania and commonly find coral fossils, but this one’s the most unique I’ve found to date. Thoughts on what it might be?

Found tons of petrified wood in the area too

Very cool fossils in this rock. I’m particularly interested in the long linear impressions. Ideas?

My first time rockhounding! Got luckier than I dared hope 😄 Thank you

It looks like a tiny gear, about 2.5 mm in diameter. Lines can be seen behind it in the cavity, kind of like a shell. Any help would be appreciated.

Found off the coast of Greece!

1 just stuck out as wierd , maybe some kind of bone - didn’t look like wood.

2 looks like a chain coral to me

5 I see all the time , maybe a wierd uniform death plate of some kind?

6 initially thought it was a horn coral but it has different markings

found in Owadów-Brzezinki quarry in central Poland. the place is mostly known for ammonites, oysters, brachiopods and horseshoe crabs.

I unearthed this stone today and it has so many weird ridges.

Found in the summer on a beach in East Dorset, UK. Could this intriguing individual be a fossil?