A few strange rocks from a cornfield, Have to be Native American something.

[prolab69]

They all seem "worked" in one way or another, The 4inch black chert fits in the hand perfectly as a tool for something, The last one seems to be a spear point, the others i imagine are tools maybe? I have found smaller arrowheads, but these are much larger.

 

[eyemustdigtreasure]

Nice stuff!
You have a good eye for man-made lithics!
Just about all seem to be, save one or two.
I'd have to see how the parent rocks fracture, first,
to tell, but........

 

[Older The Better]

Most look good I’d say cores or choppers

 

[flinthunter]

In my opinion, the larger black piece could be a quarry blank but I have my doubts. The smaller black piece could have been used as a scraper. The rest are naturally formed rocks.

 

[unclemac]

I would probably call the large black one a hand axe, the others don't appear to be useful

 

[GoldieLocks]

They could have been "worked more recently." Can you bring them to a geologist for an opinion?

 

[ToddsPoint]

The black material looks to me like Esopus chert. Here's one made from Esopus from the net. Gary