images.library.wisc.eduimages.library.wisc.edu/EcoNatRes/EFacs/GeologyWI/... · GEOLOGY OF THE...
8
images.library.wisc.eduimages.library.wisc.edu/EcoNatRes/EFacs/GeologyWI/... · GEOLOGY OF THE MISSISSIPPI 'REGION. Second. The valleys of those rivers were occupied by immense streams