Retraction Note to: Natural Resources Research 21(4), 2012, 415–426 DOI 10.1007/s11053-012-9190-4

The afore mentioned article, published online: 26 October 2012 on SpringerLink (www.link.springer.com), has been retracted by agreement between the authors’ sponsoring institution, the journal’s Editor-in-Chief, the IAMG publications committee and Springer. The retraction has been agreed upon following investigations by the Kansas Geological Survey (a research and service division of the University of Kansas), the IAMG publications committee, the Editor-in-Chief and Springer, which identified unattributed areas of overlap with a number of other publications.