Dating sedimentary rock layers

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By: Tracy V. When paleontologist Mary Schweitzer found soft tissue in a Tyrannosaurus rex fossil , her discovery raised an obvious question -- how the tissue could have survived so long? The bone was 68 million years old, and conventional wisdom about fossilization is that all soft tissue, from blood to brains , decomposes. Only hard parts, like bones and teeth, can become fossils. But for some people, the discovery raised a different question.
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Rock Layers

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Sedimentary Rocks

There are three different kinds of rocks that are found in the layers of rocks. There is no specific order of the layers because the layers are always changing but one thing is for sure that the rocks in the bottom layer are the oldest rocks and the rocks at the top are the youngest layers. The reason that the rocks on the bottom of the layers of rocks are the oldest is because rocks will continue to pile on top of each other. If there is one layer of rock on the bottom and another layer piles on top of it, the layer on the bottom is now the oldest and the layer on top is the youngest.
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19.4 Isotopic Dating Methods

Sedimentary rocks form when new sediments are deposited in horizontal layers on top of older rock. Older layers may end up on top of younger layers. Finding the relative ages of rock layers can be even more complicated when an entire layer of rock is missing. Relative dating can also be done by comparing the relative ages of rock layers in different areas.
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Relative dating is the process of determining if one rock or geologic event is older or younger than another, without knowing their specific ages—i. The principles of relative time are simple, even obvious now, but were not generally accepted by scholars until the scientific revolution of the 17th and 18th centuries [ 3 ]. James Hutton see Chapter 1 realized geologic processes are slow and his ideas on uniformitarianism i. Stratigraphy is the study of layered sedimentary rocks.
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