Arrow head in the lake?

[MarshallMetalDetecting]

Took my Bunty Hunter in the lake at my Dad's house. Mind you, that is all I had to detect with so it was quite a challenge but hey I just need to find treasure, lol! I found an old sinker and a stinkin Lincoln. Went over to the other side of the dock and was chasing a coin signal which ended up being a 1944 wheaty, and pulled out what I believe is an arrow head it looks like there may be chipped marking on the edges.

 

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[Indian Steve]

I am sorry but that is not an arrowhead. Cool flat rock though.

 

[ATpro5]

First thought is not a arrowhead... but, I have found a limestone and slate arrowhead in the past. I do see what you call "chipping" but it does not have the uniform shape of a arrowhead. More pics?