Describe principles relative dating
For example, the principle of superposition states that sedimentary layers are deposited in sequence, and, unless the entire sequence has been turned over by tectonic processes or disrupted by faulting, the layers at the bottom are older than those at the top.
The principle of inclusions states that any rock fragments that are included in rock must be older than the rock in which they are included.
Have a look at the photographs below, which show the curb of a road in a neighborhood in Hollister, California.
You can see that the curb is offset: the bottom half does not line up with the top half.
An example would be that the silt back-fill of an underground drain would form some time after the ground immediately above it.
But, before that, they relied upon a different approach to first determine the sequence of important events in Earth's past: Relative age dating has to do with determining the temporal ordering of events in Earth's past.
As it turns out, the famous San Andreas fault runs below the curb at this location, which has caused the curb to be broken and displaced.
We know that the curb was originally straight when it was first constructed. This work is licensed under a Creative Commons Attribution-Share Alike 4.0 International License.
The law of superposition is an axiom that forms one of the bases of the sciences of geology, archaeology, and other fields dealing with geological stratigraphy. In its plainest form, it states that in undeformed stratigraphic sequences, the oldest strata will be at the bottom of the sequence.
This is important to stratigraphic dating, which assumes that the law of superposition holds true and that an object cannot be older than the materials of which it is composed. Superposition in archaeology and especially in stratification use during excavation is slightly different as the processes involved in laying down archaeological strata are somewhat different from geological processes.
The photograph below was captured at Volcano National Park on the Big Island of Hawaii.