looks stromatolite ish. use macrostrat if you know a more precise location, and you can see if my guess might work for age/environment

It looks like a septarian nodule. Do you have one that is broken so the inside is visible?

trilo-butt. Pygidium if you want to be fancy 😁.

I love deadhorse. There’s another trackways site just north of town, you have to walk to bike in but it’s a much larger expanse and gorgeous scenery.

the enamel on teeth tends to survive–you get a hard shiny surface on them, and if they are broken often you can see the layer of enamel over the interior. look at all the shark teeth posted here, that shine is common on many (most?) teeth from all manner of critters.

I’m not great at bones but it looks like a toe bone. Which one from what is way beyond me .

crinoid stem

I agree it looks like wood

can you put more views and a scale? nothing says very, but it does look like maybe a fossil of some kind

Dyed agate

There are a lot of psuedofossils out there. What you are seeing is probably different weathering, either the rock formed with hard and soft spots that weather differently, or it’s been against a surface that caused it to weather in different patterns. Weathering does crazy stuff, from hoodoos to wonderstone.

it’s a fun but smallish museum. Some good collecting in the area though, trilobites, corals, and stromatolites all easily collected and within a couple hours of each other.

The Idaho Museum of Natural History has a great Ray Troll whorl shark exhibit

no enamel, if it is a tooth it’s really weathered.

I’ve seen all the pictures and agree with matthew-gramling. Ironstone or similar, not a fossil.

possible stromatolite, but really depends on where you found it. If you know the location it was collected use macrostrat.org to find the formation, and see if stromatolite makes sense.

I’m guessing botryoidal jasper/chalcedony; not a fossil. nice piece though!

I wouldn’t promise it’s a fossil, but if you like it, keep it. Again though knowing where it’s from can help identify if it’s a fossil or not.

Depending on where found it might be petrified wood, but it’s really hard to say and I’m guessing probably not. Chalcedony for sure, agate-ish in pictures.