11-inch algae-covered grooved rock, knackered yet sharp

[nunyabiz111]

Found roughly 2.5km downstream from a tributary (N-W NB) which had a large potato cull dumpsite collapse into it decades ago, which may account for the colorful specs:


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So far it's only gotten a preliminary hand cleaning under the faucet. That's when I realized the "bit" end of it (if apppicable) is a bit nippy along the middle edge and could hurt someone if grabbed the wrong way.

Any input as towards what this could be if anything?

 

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[Tdog]

That piece looks like it was shaped by erosion. Natural IMO.

 

[newnan man]

A natural formed rock.

 

[The Grim Reaper]

I have to agree with natural erosion.

 

[A2coins]

I dont see any signs of it being worked but good to get opinions

 

[A2coins]

Welcome to tnet from MI Tommy

 

[CaptEsteban]

A natural formed rock.

ME TOO, NEITHER !