1. a Department of Geosciences , Idaho State University , Pocatello, ID, 83209, USA
2. b Department of Geology and Geological Engineering , South Dakota School of Mines and Technology , 501 E St Joseph Street, Rapid City, SD, 57701, USA
3. c Department of Forest Resources , University of Minnesota , 1530 Cleveland Avenue North, St Paul, MN, 55108-6112, USA