Other examples of non vertical superposition would be modifications to standing structures such as the creation of new doors and windows in a wall.
Superposition in archaeology requires a degree of interpretation to correctly identify chronological sequences and in this sense superposition in archaeology is more dynamic and multi-dimensional.
Geologists use several principles to find the relative age of geologic layers. Remember, contact metamorphism is changes in a rock due to contact with magma or lava.
- The principle of superposition is simply the fact that the lowest layer of a rock formation is the oldest layer while the youngest layer is towards the top. Think of it as a boundary layer between igneous rocks and sedimentary rocks.
In its plainest form, it states that in undeformed stratigraphic sequences, the oldest strata will be at the bottom of the sequence.
There is more to the Earth than what we can see on the surface.
In fact, if you were able to hold the Earth in your hand and slice it in half, you’d see that it has multiple layers.
They are, in order from the exterior to the interior – the crust, the mantle, the outer core, and the inner core.
Let’s take a look at them and see what they have going on.