New World Beginnings The Shaping of North America 225 mil. years ago: one landmass 350 mil. years ago: Appalachian mountains begin forming 135-25 mil. years ago: Rockies, Sierra Nevadas, Cascades, & Costal Ranges begin forming 10 mil. years ago: Basic form of N. American continent is in place Canadian Shield: zone undergirded by ancient rock; probably first part of N. American landmass above sea level; anchors continent in N.E. corner; depressed by glaciers & gouged to form lakes tidewater: coastal plain; slopes between coast & Appalachians ?roof of the Americas?: Rocky Mountain crest 2 mil. years ago: Great Ice Age begins 10,000 years ago: ice recedes & melting ice forms many now dried waterways Peopling the Americas
The American Pageant: Unit 1 Chapter 1 Notes
New World Beginnings The Shaping of North America 225 mil. years ago: one landmass 350 mil. years ago: Appalachian mountains begin forming 135-25 mil. years ago: Rockies, Sierra Nevadas, Cascades, & Costal Ranges begin forming 10 mil. years ago: Basic form of N. American continent is in place Canadian Shield: zone undergirded by ancient rock; probably first part of N. American landmass above sea level; anchors continent in N.E. corner; depressed by glaciers & gouged to form lakes tidewater: coastal plain; slopes between coast & Appalachians ?roof of the Americas?: Rocky Mountain crest 2 mil. years ago: Great Ice Age begins 10,000 years ago: ice recedes & melting ice forms many now dried waterways Peopling the Americas
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