e/Great Falls Tectonic Zone

Information
has gloss	eng: The Great Falls Tectonic Zone is a major intracontinental shear zone between the Hearne craton and Wyoming craton, basement rock of the Archean period which form part of the North American continent. The zone is an area about 100 miles (150 km) wide extending from the southwestern Idaho-Montana border across Montana to the northwestern Montana-Saskatchewan-North Dakota border. It is named for the Great Falls of the Missouri River, a major geologic feature of the area. The central and western portions of the zone are believed to be about 1.1 to 3.3 billion years old. The central part of the zone lacks Archean rock, however, leading at least one group of scientists to speculate that it was formed very late in the Paleoproterozoic era.
lexicalization	eng: Great Falls Tectonic Zone
instance of	(noun) from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms Proterozoic, Proterozoic eon, Proterozoic aeon

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