Typical geological structure in the Rocky Mountains of northern United States. From lake level to X are 3000 ft of Cretaccous sediments deposited by the Boreal Sea —limestones, shales and argillltes. X marks the position of a great thrust fault. Here the Pre-Cambrlan rocks of Canada have been pushed southwards for seventy miles. They took the lilies of least resistance and slid over the Cretaceous rocks, forming what is called the Lewis Overthrust. X is the position of the overthrust here, all rocks above.it being Pre-Cambrian.
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Auckland Star, Volume LXVII, Issue 253, 24 October 1936, Page 6 (Supplement)
Word Count
86Typical geological structure in the Rocky Mountains of northern United States. From lake level to X are 3000 ft of Cretaccous sediments deposited by the Boreal Sea—limestones, shales and argillltes. X marks the position of a great thrust fault. Here the Pre-Cambrlan rocks of Canada have been pushed southwards for seventy miles. They took the lilies of least resistance and slid over the Cretaceous rocks, forming what is called the Lewis Overthrust. X is the position of the overthrust here, all rocks above.it being Pre-Cambrian. Auckland Star, Volume LXVII, Issue 253, 24 October 1936, Page 6 (Supplement)
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