EESB18H3 Chapter 20: Chapter 20
16 Oct 2011
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Document Summary
What are the main geological building blocks of north america. A geologic jigsaw: northern part of ca, underlain by exposed ancient core ( craton) called the canadian shield; consists of archean and proterozoic rocks that are 4-1 bil yrs old and are fossils. The north american craton vs the canaian shield: North american craton: exposed parts of the craton and consists of gently undulating surface that rises. Stage 3- the grenville orogeny and formation of rodina: Iapetus ocean resembles modern atlantic ocean ; areas of warm water provided nutrient rich habitat for organism major stimulus for cambrian explosion. Stage 4- pangea: north america in the late palozoic and some of the mesozoic. Acadian orogeny and later carboniferous collision called allegehenian orogeny . Why did the dinosairs disappear so suddenly: meteorite impact that hit yucatan peninsula 65 mil years ago. Canada in the cenozoic: the artic cools down.
