Two other mappable units included the outwash deposits of the Zenda and Walworth Formations. Lastly, the lowermost unit was mapped as the valley fill of a major local bedrock valley in the area.LAU, Jodi A
This South Dakota county map displays its 66 counties. The Missouri River cuts through South Dakota, and it’s this river that delineates several county boundaries separating South Dakota into western and eastern portions. South Dakota bordersNorth Dakota,Nebraska,Minnesota,Iowa,Wyoming, andMontana. ...