numerical dating of rocks and fossils

C: The History of Planet Earth. The principle of faunal succession states that different fossil species always appear and disappear in the same order, and that once a fossil species goes extinct, it disappears and cannot reappear in younger rocks Figure 4. The K-Pg extinction is thought to have been caused by the impact of a large extraterrestrial body 10 km to 15 km across , but it is generally agreed that the other four Phanerozoic extinctions had other causes, although their exact nature is not clearly understood. Holland, Y. When we examine sedimentary rocks, we often find that they contain fossils. Brain Metrics. In such cases, we can date the fossil-bearing layers relative to one another using other lines of evidence and reasoning.

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