some i have is creek cobbles. but most is found in farm country. or construction sites.
i know where there is some ledge formations but the quality is unknapable even when heated
the abo mineing areas are protected.
i never knap my bigger pieces.( someday i will when i am better) and i only knap it when my zen is right. sometimes i pick up a piece take a nice flake, smile and put it back down