NOYFBAH
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Originally mistook this as an ironstone concretion. Wasn't until I opened the pictures I took that I realized what it was. Had to drive 60 miles to go back and get it the next day!
DutchCraft2050
If you have 40 you're the expert not me.
NOYFBAH
Well, I know they are sponges at least lol. Some from the Cretaceous and some from the late Cambrian early Paleozoic but thats about it
NOYFBAH
Oh and possibly a couple from the surilian