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scarce. In parts of southwestern North Dakota, which were not reached by the most recent glaciers, the only evidence of the early glaciations is an occasional erratic, the remaining glacial sediment having been removed by erosion long ago. Only the most recent glaciation, the Wisconsinan glaciation,...
| Language: | unknown |
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| Online Access: | http://cdm16921.contentdm.oclc.org/cdm/ref/collection/ndbb/id/9380 |