huronian वाक्य
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- There have been periods in Earth's history when the entire Earth was frozen solid, see Snowball Earth and Huronian glaciation . talk ) 21 : 58, 25 September 2011 ( UTC)
- In 1906, as he began his graduate studies, Collins joined the Geological Survey of Canada, and remained there until his death in 1937 . with a particular focus on the Huronian Supergroup.
- Another, much earlier and longer snowball episode, the Huronian glaciation, which occurred 2400 to 2100 Mya, may have been triggered by the first appearance of oxygen in the atmosphere, the " Great Oxygenation Event ."
- Rifting of continental plates create sedimentary basins; the largest of these basins in the Great Lakes area are the Animikie Group in Minnesota, the Marquette Range Supergroup in northern Michigan and Wisconsin, and the Huronian Supergroup in eastern Ontario.
- Ancient miogeoclines such as the Neoproterozoic to Cambrian Cordilleran miogeocline of the southwestern U . S ., the Paleozoic Appalachian miogeocline, the Precambrian Belt Supergroup of Montana and Idaho and the Huronian sediments of Canada which were involved in the Grenville Orogeny.
- The "'Nipissing sills "', also called the "'Nipissing diabase "', is a large 2217 to 2210 million year old group of folding of Huronian rocks, and are hornblende gabbro of tholeiitic basalt composition.
- Before this, Lake Huron was a low-lying depression through which flowed the now-buried Laurentian and Huronian Rivers; the lake bed was criss-crossed by a large network of tributaries to these ancient waterways, with many of the old channels still evident on bathymetric maps.
- Either way, the oxygen did eventually accumulate in the atmosphere, with two major consequences : First, it oxidized atmospheric methane ( a strong greenhouse gas ) to carbon dioxide ( a weaker one ) and water, triggering the Huronian glaciation, 2.4 to 2.1 billion years ago.
- The Huronian deposits in Canada generally contain higher grades ( 0.15 % U 3 O 8 ) and greater resources ( as shown by the Quirke mines ), however some of the South African gold deposits also contain sizeable low grade ( 0.01 % U 3 O 8 ) uranium resources.
- The Snowball I episode ( of the Huronian glaciation 2.4 to 2.1 billion years ) and Snowball II ( of the Precambrian's Cryogenian between 580 850 million years and which itself had a number of distinct episodes ) are respectively thought to be caused by the evolution of oxygenic photosynthesis and then the rise of more advanced multicellular animal life and life's colonization of the land.
- Compressive deformation during the Penokean orogeny reactivated the GLTZ, which followed deposition of the Marquette Range Supergroup sediments and resulted in a north-side up motion along steep brittle-ductile faults in the eastern, low-grade portion of the Marquette Trough In the western portion of the Marquette syncline, a second episode of GLTZ reactivation took place during the uplift of the post-Huronian 2, 400-to 2, 100-million-year-old granitic Southern Complex.
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