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Years Ago: 470 - 220 million | 220 - 80 million | 80 - 25 million | 25 million | 25 - 10 million | 10 - 2 million | 2 million | 20,000 | 10,000 | Today ..NEXT> |
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how Yosemite Valley was formed
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Years Ago: 470 - 220 million | 220 - 80 million | 80 - 25 million | 25 million | 25 - 10 million | 10 - 2 million | 2 million | 20,000 | 10,000 | Today ..NEXT> |
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470 - 220 million years ago:
Layered sediments covered the sea floor west of the North American continent. |
