Natural or man made?

[BoulderTroll]

Found this in a small creek in Southern California. It stood out as an unnatural shape. Anyone care to share their opinion?

 

[dognose]

It looks like an encrusted piece of scrap iron to me.

 

[Midden-marauder]

Found this in a small creek in Southern California. It stood out as an unnatural shape. Anyone care to share their opinion? View attachment 2124373

Is it metallic? Ferrous? I've seen similar pieces of iron detritus scattered around abandoned mines/ghost towns. Old rusted remains of what have you that are pretty much unrecognizable as anything distinctly man made or natural.

 

[BoulderTroll]

Sorry, I definitely could have added more info. It's a rock, not sure of what kind. It's not metal, didn't check if it's magnetic. To me, it has the look of being chipped (knapped) along the edges, because it tapers down to a bit of an edge.
The question is more of did it naturally erode to this, or was it some sort of tool?

 

[CreekSide]

Looks natural to me if it’s stone. If it had been worked it would be smooth and it’s not

 

[newnan man]

Something, but not man made.

 

[Treasure_Hunter]

Natural.