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GEOLOQY OP THJ3 HILL COUNTRY 7. its central parts were sunk deep below the ocean level. A sea, then extended northward from the Gulf of Mexico towards or perhaps quite to the Arctic Ocean. This sas during the last half of the Cretaceous Ago. The eastern borders of this sea appear to have extended to...
| Format: | Text |
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| Language: | unknown |
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State Historical Society of North Dakota
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| Online Access: | http://cdm16921.contentdm.oclc.org/cdm/ref/collection/ndsl-books/id/55458 |