FULL EPISODE Lesson 20 Anatomy Of A Continent - Understanding The Earth

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FULL EPISODE Lesson 20 Anatomy Of A Continent - Understanding The Earth
Planet of Man Series -- Shield of Plenty
Intro - Dr. David Pearson
Starring; Tuzo Wilson -- renowned geophysicist
Anatomy of a Continent-Lesson 20-Part 1 of 6
Planet of Man -- Shield of Plenty
•Typical topography of Northern Ontario and northern Canada
•Canada's wealth is found in the shield
•Precambrian characteristic -- red, granitic & contorted
•Oldest rock in the world - precambrian
•Cambrian name derived from rocks found in Wales that are .5 billion years old
•Grenville rocks formed about 1 billion years ago
•Mining footage from the 1960's -- showing headframes, blasting in open pits and underground
•17% of earth is made of Precambrian shield; Canadian Shield, South American Shield, Indian Shield, Baltic, African, Australian
•Shields are hard to live in and difficult to penetrate
•Precambrian rocks found at bottom of canyons - Grand Canyon
•Precambrian rocks found at base of mountains -- New Mexico
•Geological time -- Precambrian time -- scale showing time
•20th century idea of age of the earth-- 1917; earth age 1 billion, 1947; 3 billion years old today 4.5 billion years
•Precambrian rocks still being studied and researched.

Anatomy of a Continent-Lesson 20-Part 2 of 6
Planet of Man -- Shield of Plenty
•Canadian pacific railway through Canadian Shield which lead to the discovery of the Sudbury basin
•Vintage footage showing underground mining
•Fred Larose -- silver ore discovered Cobalt Ontario
•Vintage footage of silver smelting in the Cobalt area
•Exploration of Precambrian rocks
•Stromatolites in Northwest territories and Australia
•Radiometric dating guide in determining age of rock
•Archean and Proterozoic rocks
•Greenstone belts -- formation and origin unknown but wealth of resources are found here.
•Differences between Archean and Proterozoic rock types are important.

Anatomy of a Continent-Lesson 20-Part 3 of 6
Planet of Man -- Shield of Plenty
•Geological exploration team analysing Precambrian rock in Northwest territories
•Differences between Archean and Proterozoic rock types are important.
•Precambrian rocks of the Grand Canyon a layer above the Precambrian is missing??
•Sedimentary rock was once thought the oldest rocks on earth
•Elliot lake ores discussed by David Pearson -- sedimentary rock Brannierite ores are Precambrian time.
•No oxygen in the Precambrian Evidence of life in the Precambrian -- Stromatolite
• Formation of the atmosphere in early time
•Geologists collecting rock samples in the Precambrian shield preparing to leave
•Fossils are few in Precambrian
•More information needs to be found about Precambrian although still hunting for minerals in the Precambrian will always exist

Anatomy of a Continent Lesson 20 - Part 4 of 6
Host Dr. David Pearson
•Canada is a good case study of the geological makeup or in other words geological anatomy of continents.
•Geological maps on a map - dip, strike, type, age of years
•Explaining, from a geological map of Canada, the various items on a geological map.
•Patterns of Anticline, syncline
•Patterns of faulting

Anatomy of a Continent - Lesson 20 - Part 5 of 6
•Patterns of faulting.
•Greenstone belts - Iron formation (red and black bands), Basalt (greenish), originated in water.
•Pillow Lavas - best exposure in Yellowknife.
•Greenstone Origins.
•Divisions-units (age) in the Canadian Shield.

Anatomy of a Continent - Lesson 20 - Part 6 of 6
•Proto continents
•Unconformity
•Elliot Lake Sediments accumulated on the edge of a Proto continent.
•Great example that shows the behavior of the continental crust. Great Slave Lake area between Yellowknife and the arctic coast.
•Ancient Limestone's in Great Slave Lake area.
•Stromatolites - Great Slave Lake area.

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