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The lava flow took place some time after the diorite cooled, was uplifted, and then eroded.

(Hammerhead for scale) [SE]Figure 8.6b Rip-up clasts of shale embedded in Gabriola Formation sandstone, Gabriola Island, B. The pieces of shale were eroded as the sandstone was deposited, so the shale is older than the sandstone.

Correlation with them has helped geologists date many New Zealand rocks, including those containing dinosaurs.

An example of an unconformity is shown in Figure 8.8.Relative dating does not provide actual numerical dates for the rocks.Fossils are important for working out the relative ages of sedimentary rocks.Suppose you find a fossil at one place that cannot be dated using absolute methods.That fossil species may have been dated somewhere else, so you can match them and say that your fossil has a similar age.

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