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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.
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.
Most of the cases documented by the RATE team proved to be weak tests for their hypothesis.
" This article addresses that question, which represents the thinking of a large number of people today.
by Tas Walker A geologist works out the relative age of a rock by carefully studying where the rock is found in the field.
The field relationships, as they are called, are of primary importance and all radiometric dates are evaluated against them.
To test the hypothesis, researchers sought cases in which nuclear decay could be compared against some other natural phenomenon.
Think of radioactive nuclei as a clock that ticks (i.e. The only way to demonstrate that nuclear processes “ticked” faster in the past was to compare their decay rates to another, more accurate clock.
Clearly, Sedimentary Rocks A were deposited and deformed before the Volcanic Dyke intruded them.