Absolute dating geology
The main difference between absolute and relative dating is that the absolute dating is a technique to determine the numerical age of a rock or a fossil whereas the relative dating is a technique that determines the relative age.Furthermore, absolute dating can be done with the use of radiometric dating while relative age is determined with respect to other layers.Absolute age is a quantitative measurement while relative age is a qualitative measurement.Absolute dating works better for igneous and metamorphic rocks while relative dating works better for sedimentary rocks having layered arrangement of sediments.The four methods involved in absolute dating are radiometric dating, amino acid dating, dendrochronology, and thermoluminescence while biostratigraphy, stratigraphy, and cross dating are involved in the relative dating.The precision in absolute ageing is high while the precision of the relative ageing is low.
Using deductive reasoning, tell a story in chronological order. There are a few techniques used to help us relatively date rock strata.
The Law of Superposition states that in undisturbed layers of rock, the oldest rocks are on the bottom and get young in age as you move up the layers.
We already know that sedimentary rocks are formed by sediments being horizontally deposited. Bottom layers remain unseen to us until tectonic processes or weathering and erosion make them visible.
Cross-cutting relationships states that any feature that cuts across a body of rock is younger than the rock that it cuts across.
Faults can offset layers which tells us that the fault happened after the layers was deposited.