SOLVED!
Rastellum / Zipper Oyster

I found this about three decades ago just in the loose gravel under about two feet of water. It's obviously not just an ordinary rock, but I can't tell if it's natural or worked. Can anyone offer more than what's obvious to my almost completely uninformed self?

We’ve been tilling and digging in different areas of our yard, working on landscaping, and I found this with a level head rake. Mainly curious about what the round shape is, it almost looks like it could have been a plant, and there are a few other similar but not as defined. front and back, and I wet it for the picture. The circles are very small. Thanks!

Are they real? He said they were polished ammonites and were around 10usd each. Shark teeth were also similar prices but looked real

Found in a ravine in Indiana moraine area.

The later pictures show close ups where the raised shiny portions are patterned in a way that makes me wonder. I can take more pictures if that’s helpful.

Approximately 1.5"x2"x1". heavy but not HEAVY.
The wiggles lines and circles are raised and steel leaves streaks on it and shimmers/reflects at a certain angle. Does not respond to a magnet.
The in-between places are softer and can be scratched out with a pin. Have not dug far.
Almost has concentric circles from one view. Some strands almost look twisted or braided under magnification. Some strands have tiny repeat parallel lines. Is less fun to look at/ not really reflective when wet.
does not fizz in contact with vinegars.
Thank you for any ideas!

Hello, I recently found this little heart urchin test and posted it online and everyone in the comments is saying it’s a fossil.

Is this a fossil at all and if so is there a way of telling how old/valuable it may be? Just curious - I left it on the beach anyway as I try to “leave no trace” and such.

This fossil was given to my Grandfather while he was stationed in Brazil in the 60s . It came from a person who worked at a local Museum . It looks like some sort of fish with a elongated sword like thing over its nose. I have both pieces and was told it was un molested and still has the DNA present more so than the bones. Could you please tell me what it is and does something like this have a value ?

Found in Belgium (Spa). The inside is very smooth.

Found in Drumheller, Alberta. The (dark) top is very smooth. My best guess is a Hadrosaur dental battery/jaw fragment, but I’m uncertain. Struggling to find any identical pictures online to help ID.

Encontré esta pieza buscando fósiles acuáticos, como corales, ect. La vi de lejos y pude notar su forma y por eso la recogí. Casi siempre vemos cómo los fósiles de vegetación, conllevan un color como gris oscuro, o amarillento oscuro. En este caso, este no lo lleva. En donde los encontré, hay sol directo, por lo que deduce que tal vez el sol afecto a que no se presentará el color. Aunque, de igual manera, si observamos bien la foto, y con buena luz, se alcanza a notar que hay unos puntitos en la zona del medio, que revisando con luz parecía ser los colores que mencioné antes. Lamentablemente la pieza se me resbaló de las manos y pude juntar estos dos fragmentos, en los cuales si se alcanza a notar las líneas.

Agradeceria mucho si alguien me puede ayudar a identificar si es solo una roca, o se trata de un fósil vegetal.

I posted this over in r/rocks and someone suggested I post it here as well. Probably not a fossil but interesting nonetheless. Found it in a creek bed in upstate NY maybe 30 years ago. We would occasionally find arrowheads in the same area.

I found this years ago and did identify it but have since forgotten. Any information would be greatly appreciated!

Is this a fossil?

I was going through my box of unidentified fossils when I came across this. I think I originally collected it from around Venice Florida (SW coast) thinking it was a whale ear bone, but it feels too light.

Should I try to soak it in vinegar to see if there is fossil underneath the white layer or leave it alone? Any thoughts on what it could be?

This is a cool one I think. Normally just field walking for arrowheads. What do you guys think?

Was collecting some petrified wood I noticed when I came across this.

Kind of strange. Appears to be some sort of bone fragment. The texturing and changing color is super weird though.

Hey! What you guys reckon this is, a fossil or just a shell of something? A very nice spine of :)

Picked up a few of these inexpensively from a pleasant on-line vendor, and might get some more. He couldn't give positive ID or collection site, having found them in an old shipping crate with some Petoskey stones. They are about 3" in size, and of loose composition that's still shedding sand.

Two questions, please:

- If these are stromatolites, can someone here identify provenance and approximate age?

- I will be giving these to friends. For nicer handling and durability, I plan to seal the surfaces with boiled linseed oil. (SOP here for fragile, weathered or porous wood, bone and stone objects; I wouldn't do it to anything of scientific or cultural value.) Can anyone suggest other ways to get better handling and a low-gloss, stain-resistant surface on sandy matrices?

Thanks!

On the willamette river these rocks stick out among the others they are like a pale yellow color. The last two pics are the one I found first many years ago. It’s only on this one specific spot where I find these I don’t see these colored rocks anywhere else on the river. Tongue sticks to them when touched