Steno developed a set of Laws (Steno's Laws) to help explain his method of inferring the ages of geological structures.
These laws are a set of hypotheses that the scientific community accepts as a starting basis without absolute proof.
The age of the carbon in the rock is different from that of the carbon in the air and makes carbon dating data for those organisms inaccurate under the assumptions normally used for carbon dating.
Carbon-14 cannot be used to date biological artifacts of organisms that did not get their carbon dioxide from the air.
This rules out carbon dating for most aquatic organisms, because they often obtain at least some of their carbon from dissolved carbonate rock.
Different methods have their own limitations, especially with regard to the age range they can measure and the substances they can date.
A common problem with any dating method is that a sample may be contaminated with older or younger material and give a false age.
Clearly, Sedimentary Rocks A were deposited and deformed before the Volcanic Dyke intruded them.