mesozoic through cenozoic. what was happening back in the western cordillera? all the stuff we...
TRANSCRIPT
![Page 1: Mesozoic through Cenozoic. What was happening back in the Western Cordillera? All the stuff we already talked about plus…. Hawaii!](https://reader036.vdocument.in/reader036/viewer/2022070412/5697bf731a28abf838c7f174/html5/thumbnails/1.jpg)
Mesozoic through Cenozoic
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What was happening back in the Western Cordillera?
All the stuff we already talked about plus….
Hawaii!
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Pangaea breaks up
• Red beds, basalts and normal faults on East Coast• How do we know what other continent North
America broke away from? What is your evidence?
• fit of continents, fossils, paleomagnetic stripes on Atlantic floor, climate bands, paleomag on continent, glacial till etc., ancient mtns and rocks that run across the continent boundary
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What’s happening in Europe and Asia?
• Look at the maps• Watch the animations• Alps?• India?• Mediterranean (maps)
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Alps/ Himalaya
• As Africa and India move northward, they collide with Europe and Asia
• India forces SE Asia and China to the east as it pushes northward
• Creates SE Asian peninsulas, Sea of Japan and Tibetan Plateau as well as Himalayas
• Tethys closes and dries up, leaving a basin where the new Mediterranean sea floor forms. The Med fills as the Gibraltar end erodes through to the Atlantic
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What’s happening to Central America?
• Animation
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Cenozoic Glaciation• Extent of glaciation in N. America and Europe• Effect on world climate belts• Evidence for glaciation?• Glacial till – unsorted, angular• U-shaped valleys, horns, cirques, aretes• Glacial striations & polish• Moraines – piles of debris left as glacier melts• Erratics – large boulder carried by a glacier and
dropped as it melted• Dropstones – boulder dropped when iceberg
melts
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Consequences of glaciation
• Glacial lakes and pluvial lakes
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Kettle lakes in Minnesota
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Pluvial lakes: formed from increased rainfall south of the glaciers
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Consequences of glaciation
• Glacial lakes and pluvial lakes• Glacial deposits– Moraines and till– Glacial outwash – rock dust carried by meltwater– Loess (wind-blown rock dust)
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Consequences of glaciation
• Glacial lakes and pluvial lakes• Glacial deposits • Glacial landscapes
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Consequences of glaciation
• Glacial lakes and pluvial lakes• Glacial deposits • Glacial landscapes• Large continental shelves
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Consequences of glaciation
• Glacial lakes and pluvial lakes• Glacial deposits and landscapes• Large continental shelves• Exposed Canadian shield – all younger rocks
scraped off
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