 | 1861 - 368 páginas
...results of three years' exploration of the British Territories in North America along the frontier line of the United States, and westward from Lake Superior...plateau has once been complete to the eastern axis, but is now incomplete along its eastern edge, the soft strata having been removed in the region of... | |
 | 1861 - 734 páginas
...westward from Lake Superior to the Pacific Ocean. It began by showing that the central portion of Xorth America is a great triangular plateau, bounded by...plateau has once been complete to the eastern axis, but is now incomplete along its eastern edge, the soft strata having been removed in the region of... | |
 | 1861 - 534 páginas
...Superior to the Pacific Ocean. It began by showing that the central portion of North America is a-great triangular plateau, bounded by the Rocky Mountains,...is of fresh-water origin ; the next belongs to the DrifUdeposits, and the highest is the great Prairielevel of undenuded Cretaceous strata. This plateau... | |
 | Samuel Joseph Mackie - 1861 - 664 páginas
...nearly follows the political boundarv-line, and throws the drainage to the Gulf of Mexico and the Aretic Ocean. The northern part of this plateau has a slope,...plateau has once been complete to the eastern axis, but is now incomplete along its eastern edge, the soft strata having been removed in the region of... | |
 | Samuel Joseph Mackie - 1861 - 670 páginas
...boundary-line, and throws trie drainage to the Gulf of Mexico and the Arctic Ocean. The northern part <>f this plateau has a slope, from the Rocky Mountains to the eastern or Laurcutian axis, of six feet in the mile, but is broken by steppes, which exhibit lines of ancient... | |
 | 1862 - 448 páginas
...Ocean, and divided into two slopes by a water-shed that nearly follows the political boundary line, and throws the drainage to the Gulf of Mexico and...plateau has once been complete to the eastern axis, but is now incomplete along its eastern edge, the soft strata having been removed in the region of... | |
 | 1862 - 446 páginas
...Ocean, and divided into two slopes by a water-shed that nearly follows the political boundary line, and throws the drainage to the Gulf of Mexico and...plateau has once been complete to the eastern axis, but is now incomplete along its eastern edge, the soft strata having been removed in the region of... | |
 | 1862 - 476 páginas
...Ocean, and divided into two slopes by a water-shed that nearly follows the political boundary line, and throws the drainage to the Gulf of Mexico and...plateau has once been complete to the eastern axis, but is now incomplete along its eastern edge, the soft strata having been removed in the region of... | |
 | 1865 - 458 páginas
...Ocean, and divided into two slopes by a water-shed that nearly follows the political boundary line, and throws the drainage to the Gulf of Mexico and...plateau has once been complete to the eastern axis, but is now incomplete along its eastern edge, the soft strata having been removed in the region of... | |
 | 1861 - 612 páginas
...commandof Captain J. Palliser (1857-60)." By James Hector, MD Communicated by Sir RI MurchUon, VPGS • This paper gave the geological results of three years'...plateau has once been complete to the eastern axis, but is now incomplete along its eastern edge, the soft strata having been removed in the region of... | |
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Ocean, and divided into two slopes by a watershed that nearly follows the political boundaryline, and throws the drainage to the Gulf of Mexico and the Arctic Ocean. The northern part of this plateau has a slope, from the Rocky Mountains to the eastern... 