A lot of “coprolite” commercially available probably is not. Unless you know the exact area it came from and/or have it analyzed there’s really not much certainty.

Rock with a tooth shape

I don’t see turtle scute. Can you post more angles and one with a ruler or something for scale? I want to say it’s a fish tooth but I’m not super confident of that with just this image.

not convinced it’s a fossil, mostly based on the outer edge. Hopefully someone who knows the area can say for sure.

You should be able to click on the other photo and see an edit button to the lower right. you can upload multiple photos from there. But it depends if you made it a specimen or just a post to the group. Sorry that’s all I can help with.

nice piece!

You should grab a basic geology text and read up. The rate of cooling and methods of deposition account for a lot of the variety of crystal structures. It’s easy to see at home with salt water. Make a concentrated solution and spread some thinly on a cookie sheet so it dries fast. Pour an inch or so in a cup and let it evaporate until it’s gone.…[Read more]

@j-r-3 if the item is added as a specimen you can add multiple pics. From the app click on the image and there’s an edit button. Works similarly on the website. It’s if the post is as an image directly to group or forum the option is not available.

Ammonite, yes. Species I don’t know.

ray plates is my first thought too, though they are so bright in the picture it is hard to tell

Add location info to it if you want age. It looks like wood or other plant material that the concretion formed around. I have a piece of wood with similar texture that is Jurassic. There are also margaretia dorus that look like this, though it looks from this one image to be more 3-d than Margaretia. more pictures, especially the “top” edge in…[Read more]

Very doubtful, and this is really a place for fossils. You might have a local rock shop that can help you id eburgs.

The right conditions is really all. Iron concretions are not terribly unusual, and generally if the conditions are right to form one they are right to form many.

Looks like crinoid stem to me

@Matthew-Gramling is correct in the general ages of the area. However Washington is a complete mess of stuff, and while googling I found the paper linked below, which includes baculites collected from an Island in Vancouver. What little I know of “buffalo stones” and Native Americans is they are somewhat talismanic, and might have been carried…[Read more]

I really think this is a bunch of concretions.

Also known as a Buffalo Stone as if viewed from the top it somewhat resembles the shape of a buffalo. But it’s baculite/ammonite segment as mentioned.

The “back” looks like might be coral or something, but it’s not very clear. A bunch of parallel lines.