1 | Geological time 2009-07-07 |
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2 | The age of rocks 2009-07-07 |
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3 | Coins and fossils 2009-07-07 |
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4 | Geological maps 2009-07-07 |
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5 | Rock layers 2009-07-07 |
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6 | Geology at Siccar Point 2009-07-07 |
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7 | Radiometric dating 2009-07-07 |
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