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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.
In the same way, by identifying fossils, he may have related Sedimentary Rocks B with some other rocks.
The Slides are to be shown at the front and then each item is shown in turn and the pupils use their graphs to calculate the age of each item from the percentage of carbon found in them. take longer than you think, but keeps them engaged and there're questions to be answered in their books also.
Easily modified for different abilities, with my low ability I made all the percentages either 75%, 50% or 25% to make it much easier for them. The worksheets can be used in a number of ways, I used them in two ways, I laminated them both in the same pouch front to back for them to use as a mini whiteboard and write directly on them with a whiteboard pen then rub out the ink for reuse for different questions and classes and to use as group work.
Thus, he already ‘knows’ that the igneous dyke must be younger than 200 million years and older than 30 million years.
(Creationists do not agree with these ages of millions of years because of the assumptions they are based on.) Because of his interest in the volcanic dyke, he collects a sample, being careful to select rock that looks fresh and unaltered.