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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 mil
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Document Date: 2007-04-03 15:11:39
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Company
Montana Travertine Co. /
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Event
Natural Disaster /
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Facility
Basement Rocks The /
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MusicGroup
B.C. /
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NaturalFeature
Northern Rocky Mountains /
Yellowstone /
Belt Mountains /
Six Mile Creek /
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ProvinceOrState
Montana /
Idaho /
Washington /
Oregon /
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Region
western Montana /
central Montana /
Northern Rocky Mountains /
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SocialTag
Alluvium
Geology of the Grand Teton area
Geology of the Death Valley area
Geology
Petrology
Sedimentary rock