Canadian Shield

•  Guiana Shield

  The Guiana Shield is one of the three cratons of the South American Plate. It is a 1.7 billion year old Precambrian geological formation in northeast South America that forms a portion of the northern coast. The higher elevations on the shield are called the Guiana Highlands, which is where the impressive and mysterious table-like mountains called tepuis are found.

  

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•  Baltic Shield

  The Baltic Shield (sometimes referred to as the Fennoscandian Shield) is located in Fennoscandia, northwest Russia and under the Baltic Sea. The Baltic Shield is defined as the exposed Precambrian northwest segment of the East European Craton. It is composed mostly of Archean and Proterozoic gneisses and greenstones which have undergone numerous deformations through tectonic activity (see Geology of Fennoscandia map).

  

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•  Peridotite

  A peridotite is a dense, coarse-grained igneous rock, consisting mostly of the minerals olivine and pyroxene. Peridotite is ultramafic, as the rock contains less than 45% silica. It is high in magnesium, reflecting the high proportions of magnesium-rich olivine, with appreciable iron. Peridotite is derived from the Earth's mantle, either as solid blocks and fragments, or as crystals accumulated from magmas that formed in the mantle.

  

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•  Craton

  A craton is an old and stable part of the continental lithosphere. Having often survived cycles of merging and rifting of continents, cratons are generally found in the interiors of tectonic plates. They are characteristically composed of ancient crystalline basement rock, which may be covered by younger sedimentary rock. They have a thick crust and deep lithospheric roots that extend as much as a few hundred kilometers into the Earth's mantle.

  

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•  Shield (geology)

  A shield is generally a large area of exposed Precambrian crystalline igneous and high-grade metamorphic rocks that form tectonically stable areas. In all cases, the age of these rocks is greater than 570 million years and sometimes dates back 2 to 3.5 billion years.

  

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•  Congo craton

  The Congo craton, covered by the Palaeozoic-to-recent Congo basin, is an ancient Precambrian craton that with four others makes up the modern continent of Africa. These cratons were formed between about 3.6 and 2.0 billion years ago and have been tectonically stable since that time. All of these cratons are bounded by younger fold belts formed between 2.0 billion and 300 million years ago.

  

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•  East Antarctic craton

  The East Antarctic craton is an ancient craton that forms most of Antarctica. It was part of the Nena supercontinent 1.8 billion years ago. During the early Paleozoic Era East Antarctica joined the Gondwana supercontinent. During the Mesozoic breakup of Gondwanaland, East Antarctica separated from other major continental areas. During and following this breakup the tectonic terranes of West Antarctica were added to form the current continent of Antarctica.

  

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•  Arabian-Nubian Shield

  The Arabian-Nubian Shield (ANS) is an exposure of Precambrian crystalline rocks on the flanks of the Red Sea. The crystalline rocks are mostly Neoproterozoic in age. Geographically - and from north to south - the ANS includes the nations of Israel, Jordan. Egypt, Saudi Arabia, Sudan, Eritrea, Ethiopia, Yemen, and Somalia. The ANS in the north is exposed as part of the Sahara Desert and Arabian Desert, and in the south in the Ethiopian Highlands, Asir province of Arabia and Yemen Highlands.

  

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•  Bangweulu Block

  The Bangweulu Block is a cratonic unit that forms part of the Congo craton of central Africa. The Bangweulu Block however consists of Palaeoproterozoic granitoids and volcanics, and is overlain by a Palaeoproterozoic continental sedimentary succession, the Mporokoso Group, and does not preserve much direct evidence of Archaean protoliths.

  

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•  Platform cover

  In geology, a platform cover is the sedimentary and volcanic deposits that lie on top of a craton.

  

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• Cratons by likeorhate
• Geology of Greenland by likeorhate
• Geology of Michigan by likeorhate
• Geology of Minnesota by likeorhate
• Geology of New York by likeorhate
• Geology of Wisconsin by likeorhate
• Physical geography by likeorhate
• Physiographic divisions by likeorhate
• Regional geology by likeorhate
• Stratigraphy of Canada by likeorhate
• Geology of Saskatchewan by likeorhate
• Geology of Alberta by likeorhate
• Geology of Manitoba by likeorhate
• Geology of Nunavut by likeorhate
• Geology of Ontario by likeorhate
• Geology of Quebec by likeorhate
• Geology of the Northwest Territories by likeorhate
• Geology of Newfoundland and Labrador by likeorhate

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•  American Ballet Theatre

  American Ballet Theatre, based in New York City, was one of the foremost ballet companies of the 20th century. It continues as a leading dance company in the world today. A writer for London's The Observer describes the ABT along with the New York City Ballet and the San Francisco Ballet to be a "triumvirate of great classical companies defining the American style on the world stage today".

  

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•  Bolzano's theorem

  

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•  Collectivité sui generis

  

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•  Canales, Ávila

  

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•  Mike Buresh

  Mike Buresh is currently the Chief Meteorologist on Action News at WTEV/WAWS in Jacksonville, Florida. He broadcasts the weather on all evening newscasts . Mike studied meteorology at Oklahoma University. He also chased storms and was employed by the National Weather Service while in college. He graduated from Iowa State University. Shortly after graduating, Mike became a Certified Broadcast Meteorologist.

  

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