Stringman, that looks like "harvester" chert, Good stuff!
Alot of the rock in N.E Mo has brown in it, not sure how far over you are?. Really cool stuff. If you run onto more than you can handle, bring some to Mojam,maybe you could get rid of some?
Also, if you find some good solid large pieces, put them back and leave them until you get your confidence in spalling them. You'll be sorry later if you don't. Trust me on this.