These were found in the so-called black soil area and they have a very distinctive appearance with beautiful flowbanding and quite bright blue agate. Black Soil Blues was the nickname I almost instantly gave them - I'm not sure if they have a more official name. I'll update with any more info as I find it.
Small Agate Creek Black Soil Blue Specimen
Double Agate Creek Black Soil Blue Specimen
Agate Creek Black Soil Blue Specimen with Beautiful Flowbanding