dude, Missouri is absolutely loaded with Burlington chert...in fact, it's the state rock. When I drove through Missouri on I-70 several years ago, the road cut through limestone beds for about 70 miles and there were large beds of flint in them. I know around Mizz-u in Columbia I saw nodules of flint in the limestone, but didn't stop to pick any up. The large beds of flint are readily noticeable from the limestone because it was very white, with even a slight blue hue to it compared to the dull gray limestone. The flint I found was somewhat cracked, but if you search through it and start hitting it, you can find some solid pieces. It is pretty tough, unless you are lucky enough to find some that's high quality. It needs to be cooked to around 500- 575 degrees, depending on the grade. Once you cook it, it's very nice to work and makes super-sharp hunting points. Haven't killed anything with burlington chert points yet...but I plan to! If you live in Missouri you are truly blessed....Missouri has more flint, and it's more widespread, than anywhere else I've ever been.