Chain marks?

[jonathan fitzpatrick]

Hello folks, new member here. I was wondering if anybody knows what causes these marks on lumber. This is black walnut 4/4 and we got a pack of 1000 ft and about every board had it, both sides and about 2 ft intervals down the length of the board. some of the tracks are so deep that the bruising under goes 1/4 in deep. Thank you for any input.
Jonathan
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[Danny Hamsley]

Could have been cut on a circle saw mill with a tooth bent or badly out of set. No excuse for a sawyer to keep producing boards with this quality issue in my opinion.

[Brian Tymchak]

wow. that's horrible. I hope you got your money back on that lot. And I would be looking for a new supplier.