Radiometric dating technique

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Thus, he already ‘knows’ that the igneous dyke must be younger than 200 million years and older than 30 million years.

In fact, he would have been equally happy with any date a bit less than 200 million years or a bit more than 30 million years.These were then eroded and Sedimentary Rocks B were deposited.The geologist may have found some fossils in Sedimentary Rocks A and discovered that they are similar to fossils found in some other rocks in the region.They would all have fitted nicely into the field relationships that he had observed and his interpretation of them.The field relationships are generally broad, and a wide range of ‘dates’ can be interpreted as the time when the lava solidified.

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