relative dating technique examples

For example, if a valley is formed inside an impact crater , the valley must be younger than the crater. That fossil species may have been dated somewhere else, so you can match them and say that your fossil has a similar age. Craters are very useful in relative dating; as a general rule, the younger a planetary surface is, the fewer craters it has. This study is called biostratigraphy. Where the rocks are not strongly folded or tilted it is possible to work out the order in which the layers were formed. Disconformity , where is a break or stratigraphic absence between strata in an otherwise parallel sequence of strata. Exercise ID: 2.

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