I know I've seen it on a map, but most of my sources are from what you've posted in the past BL. I've got a friend from Decorah who did the geology work for Bruhning (sp?), the local quarry company, and he verified it for me too. He's answered all my questions about the hydrology of the area. He was the local consultant when they did the bore-holes to map the meteor crater. The dude knows a lot. Former 101st Screamin' Eagle with a tattoo of "Old Abe" on his forearm. Viet-vet. We drink at Toppling Goliath/Dixie's and talk about the 'Nam.