a big blank or preform

[larson1951]

spotted this when driving the tractor today
i think it's an unfinished piece maybe wasn't working out so it was discarded?

 

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[quito]

Looks like they took lots of usable flakes off that piece. Probably would have ended up as a blade of some sort too.

 

[11KBP]

i think it's an unfinished piece maybe wasn't working out so it was discarded?

It looks like an expended or nearly expended core so discarded would probably be a good guess.