Newbie Identification Question

[WMP]

In an effort to get my son off his phone and computer, he and I have taken up rock hunting. We found this on a road that had been covered with river rock many years ago. He and I don't know what to make of the mark on the rock so any and all input will be appreciated. Thanks!

 

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[Terry Soloman]

Welcome from White Plains, New York! Those are "iron stains." Either rusting iron in the conglomerate rock, or where it was lodged against another iron infused rock.

 

[WMP]

Thanks Terry!

 

[kcm]

Looks to me like the staining came from metal instead of from iron-rich rock.