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History
- Published online October 21, 2007.
Copyright & Usage
American Journal of Science
Author Information
- **Geological Survey of Norway, N-7491, Trondheim, Norway
- ***Geology Department, Cornell College, Mount Vernon, Iowa, 52314, USA
- §Department of Geology and Geological Engineering, South Dakota School of Mines and Technology, Rapid City, South Dakota, 57701, USA
- ↵*Department of Geology, Union College, Schenectady, New York, 12308, USA; hollochk{at}union.edu