Free membership sex hookup - How radiometric dating works

Let us imagine that the date reported by the lab was 150.7 ± 2.8 million years.Our geologist would be very happy with this result.

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It is clear that the sedimentary rock was deposited and folded before the dyke was squeezed into place.

By looking at other outcrops in the area, our geologist is able to draw a geological map which records how the rocks are related to each other in the field.

The field relationships are generally broad, and a wide range of ‘dates’ can be interpreted as the time when the lava solidified.

What would our geologist have thought if the date from the lab had been greater than 200 million years, say 350.5 ± 4.3 million years?

From the mapped field relationships, it is a simple matter to work out a geological cross-section and the relative timing of the geologic events.

His geological cross-section may look something like Figure 2.

It relates only to the accuracy of the measuring equipment in the laboratory.

Even different samples of rock collected from the same outcrop would give a larger scatter of results. He would again say that the calculated age did not represent the time when the rock solidified.

In other words, the age should lie between 197.2 million years and 203.6 million years.

However, this error is not the real error on the date.

Clearly, Sedimentary Rocks A were deposited and deformed before the Volcanic Dyke intruded them.

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