Hi all, Quick intro i am a graduate student studying archaeology in central Minnesota and although i should know this better than i do does anyone know of any good areas to source knappable rock in the state? Ive ordered stuff online and thats all well an good but i would rather save a few bucks and find it myself. Minnesota is littered with glacial till so i know cobbles can be found just about anywhere and knife lake in the boundary waters has some decent outcrops but thats a bit of a trip from where im at. Sorry for the long post but if anyone has any advice i am happy to hear it. Thanks!