Using the same dating method (U235 and Pb207), the amount of Pb207 found in layer H is 75% and the amount of U235 found in layer I is 50%. For at least how many million years had the layer H been exposed on the surface to receive weathering and erosion before layer I started to form?
Using the same dating method (U235 and Pb207), the amount of Pb207 found in layer H is 75% and the amount of U235 found in layer I is 50%. For at least how many million years had the layer H been exposed on the surface to receive weathering and erosion before layer I started to form?
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Using the same dating method (U235 and Pb207), the amount of Pb207 found in layer H is 75% and the amount of U235 found in layer I is 50%. For at least how many million years had the layer H been exposed on the surface to receive weathering and erosion before layer I started to form?
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