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.

Not a scute. Maybe clams but I’m more inclined to say concretions. I don’t know the area so maybe someone more familiar can weigh in. More angles might help too.

That’s not a question that can be answered without a lot more info. Go to https://macrostrat.org/ and click on Geologic Map, then you can put in the nearest town to where you collected. I use satellite view to narrow down where I collected, then turn on the rock layers to see what I was actually digging in.

Need more pictures. My first guess is turtle shell but several more views might change that.

Leaning to interesting rock. Pretty certain not tooth or claw or horn, the enamel or keratin tends to preserve different from the root. This looks uniform as far as texture/material type.

@matthew-gramling I know it’s not quite your stomping grounds, but any guess? I have another of the same somewhere but the black is more worn.

I’m not seeing a fossil. It does have a fun shape though

Answers might changed based on where you found it, but to me it looks like a sandstone that an iron concretion has weathered out of. I find a lot of both in Montana and the SW deserts of the USA.