Fossil relative dating lab
The principle of faunal succession is based on the appearance of fossils in sedimentary rocks.
The law of superposition states that a sedimentary rock layer in a tectonically undisturbed sequence is younger than the one beneath it and older than the one above it.A fundamental principle of geology advanced by the 18th century Scottish physician and geologist James Hutton, is that "the present is the key to the past." In Hutton's words: "the past history of our globe must be explained by what can be seen to be happening now." The principle of intrusive relationships concerns crosscutting intrusions.In geology, when an igneous intrusion cuts across a formation of sedimentary rock, it can be determined that the igneous intrusion is younger than the sedimentary rock.This is because it is not possible for a younger layer to slip beneath a layer previously deposited.The only disturbance that the layers experience is bioturbation, in which animals and/or plants move things in the layers.