✅ SOLVED Rock, fossil, pottery shard…?

[Blackfoot58]

I found this today while creek hunting for rocks. Very distinct geometric pattern along the edge. My initial instinct was “a chunk of pottery”. The back side looks very much like limestone; so “rock?” Then, if it’s rock, would it be a fossil? Any thought appreciated. I didn’t scale it in the photo; sorry. It’s about 3/4” x 1/2” x 1” down it’s sides. About 1/8” thick.

 

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[Treasure_Hunter]

Looks like a Crinoid fossil.

 

[Blackfoot58]

Looks like a Crinoid fossil.

I’ll have to look that one up. Thanks!

 

[Blackfoot58]

I’ll have to look that one up. Thanks!

Ok I found them on-line. I’d say you are right, unless someone else has something VERY convincing. Thanks

 

[Gulf Coast Pirate]

Ancient alien technology! LOL

 

[GlowingArtist]

cement slag