Hey swede, great posts. Its nice to have a guy that really knows what hes talking about, and has a lot of experience.
I wanted to ask you a question about material in my area. I've found pieces of chert on the surface, near railroad cuts and such that are not usable. I've tried digging where there are large deposits of limestone on the surface with no luck at all. There aren't very many rivers around here, and the ones that are around are so heavily used it'd be impossible to find any useful material. How can I find usable chert?