Direct radiometric dating accuracy what type of rock is used for relative dating
’ In fact, there is a whole range of standard explanations that geologists use to ‘interpret’ radiometric dating results.
Someone may ask, ‘Why do geologists still use radiometric dating?
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.
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.
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.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.They would all have fitted nicely into the field relationships that he had observed and his interpretation of them.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.
From his research, our evolutionary geologist may have discovered that other geologists believe that Sedimentary Rocks A are 200 million years old and Sedimentary Rocks B are 30 million years old.