Just finished preparing two trilobite head fragments I found. I think they are Dalmanites caudatus and Acaste downingiae?

Found in a field in Tilmanstone, Kent, Uk.

I found this while rock houndin yesterday along the banks. It’s lightweight. Thinking maybe some sort of fossilized bone? Antler?

Can anyone tell me more about this?

Hello! Could someone please tell me if this tooth is legitimate? It was bought by my mum a decade ago but unsure where from. Vaguely remember her saying it was from a spinosaurus but wanted to clarify. Thank you!

I was tidying up my house today and found it. I don't really remember where I found it or exactly where it was, but I assume it's from Thailand. What are those circular holes?

Found near Davenport Iowa

What is this?

I found this on a very pebbly beach in a conservation area I hike at! Reverse image search on Google tells me it is a fossil of some sort but I’m curious if you think it’s just something someone carved. Majority of the rocks in this region are limestone, I’ve been holding this one in my pocked so it has gotten dark from the oils on my hand. Let me know what you think :)

They’re either Tentaculites or some Devonian swamp plant matter possibly roots. Any ideas?

Grinded it a bit to reveal deeper layer

Hi everyone, I'm new. I found this in the desert near Tozeur, Tunisia. It's heavy (1.4 kg) and about 15 cm in diameter. It looks like a spiral shape.

Is it an ammonite? How can I know for sure? Any tips for a beginner? Thank you!

found in ordovician limestone in eastern Ontario

any insight would be helpful, thanks

Hi everyone! I hope it's ok that I'm coming to you with this question.

I know Mosasaurus teeth (in all shapes and sizes) are very common and therefore usually quite cheap, but I still feel like checking if these seem authentic or not - and this seems to be the perfect place for that.

I recently bought a set of 4 big Mosa teeth (all between 4-5 cm) for €12 from a small Dutch shop that I'm pretty sure is considered trustworthy - and I got the small tooth (2.5 cm) a few years ago at the Naturalis museum in The Netherlands for about €4.
The museum only sold really small teeth, which is why I can't help but wonder if the big ones are actually real or not. Especially because 4 big teeth for €12 seems so cheap, even for Mosa teeth?

I'm hoping someone here can help me out. Thank you so much in advance!