Part 4: The Relative Time Scale

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5 Terms

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Q: How was the relative geologic time scale developed?

A: Using superposition and fossil succession, especially in Europe (1830–1841)

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Q: Who named the Cambrian?

A: Rev. Adam Sedgwick, 1830s (northern Wales)

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Q: Who named the Silurian?

A: Sir Roderick Murchison, 1830s (southern Wales)

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Q: How was the Ordovician defined?

A: Charles Lapworth, 1879, to resolve overlap/disputes between Cambrian and Silurian

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Q: What about rocks below Cambrian?

A: Contained few fossils, referred to as Precambrian