Those are my thoughts EXACTLY guys.
Well, I've been doing some reading and it appears the name "Burlington Chert"
originated from that chert there in your backyard of Burlington, IA, Iowabow.
So it's no wonder you have quite a bit around you. Even tho the chert trends southwest into Missouri
and west of you, that's where the name comes from and,ofcourse, the indians have been using it forever.
Now, I found a pretty good report on the geology of the Burlington area, but you pretty much
have to be a geologist to understand a dang word of it. Actually, it's a Field Trip Guide. I was wondering
if there was any good granite, quartzite, or hardstone in your area that you might find for hammerstones,
and I don't think so. Mostly limestone, dolomite, shales, and other sedimentary rock that isn't hard enough
to last very long as a hammerstone. So I'm going to send you a PM with alot of boring info on rock.
I would love to get back up there and some rock collecting some time. You ought to be collecting fossils, too.
Interesting tho, before Burlington was named that it was called Flint Hills and the Indian name
was Shoquoquon, ( Shok-ko-kon). It was the "Flint Ridge" of that area.
Joe