Geology of the Grand Teton area
Results: 7
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1 | 1 Basement Rocks The metamorphic basement rocks that were formed about 2.5 billion years ago in the Archean Eon. These igneous rocks are radioactive age measurements that indicate the ages of 1,690 million and 2,540 milAdd to Reading ListSource URL: www.chs.helena.k12.mt.usLanguage: English - Date: 2007-04-03 15:11:39 |
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