We found this strange piece of stone (?) on a walk in a dry river bed yesterday.
Any idea what it is?
Human made? Animal made?
I've never seen anything like it before.

We found this strange piece of stone (?) on a walk in a dry river bed yesterday.
Any idea what it is?
Human made? Animal made?
I've never seen anything like it before.

🤔 interesting! I would love to know the answer! Any geologists here on nostr? #asknostr
I don't know but looks like a washed brick stone. Or perhaps limestone? Looks awesome!
fossilized/hardened mud wasp nest
Wow. that looks like a very large and fossilized version of our mud wasp nests. (Not saying that's what it actually is! That's just what comes to mind for me.)

Got the answer!
It's bialves.
https://baynature.org/article/the-living-drill-bits-that-grind-holes-in-beach-rocks/