Rock relative dating
Laws of Relative Rock Dating
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Once a rock is lithified no other material can be incorporated within its internal structure. In order for any material to be included within in the rock it must have been rock relative dating at the time the rock was lithified. For example, in order to get a pebble inside an igneous rock it must be incorporated when the igneous rock is still molten-- such as when lava flows over the surface.
If conditions are right the remains of the dying organisms can then be preserved as fossils within the rock that formed from sediments that covered the remains. Since, all sedimentary rock is formed through the gradual accumulation of sediment at the surface over time, and since the principle of superposition tells us that newer sediment is deposited on top of older sediment, the same must also be true for fossils contained within the sediment.
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- dating used for 50-200 million year old rocks
- compare relative and absolute dating
Most sedimentary rocks are laid down in flat, horizontal layers. Geologists are able to ‘read’ the rock layers using relative and absolute dating techniques. Relative dating arranges geological events – and the rocks they leave behind – in a sequence. Relative Dating Methods For example, a xenolith in an igneous rock or a clast in sedimentary rock must be older than the rock that includes it (Figure ).
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