vol. 154 no. 2 201-216
- Received June 24, 2015.
- Accepted October 13, 2015.
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- *Department of Geography & Geology, University of Nebraska at Omaha, 60001 Dodge Street, Omaha NE 68182-0199, USA
- ‡Department of Physics and Earth Science, University of Parma, Campus Universitario - Parco Area delle Scienze 157/A I-43124 Parma, Italy
- §Department of Geosciences, University of Oslo, Box 1047 Blindern, 01316 Oslo, Norway
- ↵†Author for correspondence: