That fossil species may have been dated somewhere else, so you can match them and say that your fossil has a similar age. Accordingly, the oldest rocks in a sequence are at the bottom and the youngest rocks are at the top. According to uniformitarianism, the same processes we see around us today operated in the past as well.
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Earth Science: Crash Course History of Science #20
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Figure 2: This relative time scale divides the vast amount of earth history into various sections based on geological events sea encroachments, mountain-building, and depositional events , and notable biological events appearance, relative abundance, or extinction of certain life forms. Many of these organisms have left their remains as fossils in sedimentary rocks. Because they are often rare, primate fossils are not usually good index fossils. The present is the key to the past. For example, the element carbon has six protons, but can have six, seven, or eight neutrons.
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4 thoughts on “Relative Ages of Rocks”
This relative time scale divides the vast amount of earth history into various sections based on geological events sea encroachments, mountain-building, and depositional events , and notable biological events appearance, relative abundance, or extinction of certain life forms.
Using the principle of faunal succession, if an unidentified fossil is found in the same rock layer as an index fossil, the two species must have existed during the same period of time Figure 4. Using the diagram, determine what sequence of events occurred in the rock layers shown above.
When you complete this activity, you will be able to: