Basic principles of relative age dating

The age of a rock compared to the ages of other rocks.

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When the age of rock is compared to the ages of other rocks or events in geological time. Can determine which layers are older than others. Herrscher is older than her sister and brother. My presentations Profile Feedback Log out. Auth with social network: Registration Forgot your password?


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This is a restatement of Charles Lyell 's original principle of inclusions and components from his to multi-volume Principles of Geology , which states that, with sedimentary rocks , if inclusions or clasts are found in a formation , then the inclusions must be older than the formation that contains them.

These foreign bodies are picked up as magma or lava flows , and are incorporated, later to cool in the matrix. As a result, xenoliths are older than the rock which contains them Relative dating is used to determine the order of events on Solar System objects other than Earth; for decades, planetary scientists have used it to decipher the development of bodies in the Solar System , particularly in the vast majority of cases for which we have no surface samples.

Many of the same principles are applied. For example, if a valley is formed inside an impact crater , the valley must be younger than the crater.

Craters are very useful in relative dating; as a general rule, the younger a planetary surface is, the fewer craters it has. If long-term cratering rates are known to enough precision, crude absolute dates can be applied based on craters alone; however, cratering rates outside the Earth-Moon system are poorly known. Relative dating methods in archaeology are similar to some of those applied in geology. The principles of typology can be compared to the biostratigraphic approach in geology. From Wikipedia, the free encyclopedia.

Digital Atlas of Ancient Life

For relative dating of words and sounds in languages, see Historical linguistics. Dating methodologies in archaeology. EJ Brill , The earth through time 9th ed.


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Dinosaurs and the History of Life. HarperCollins, , pp. Canon of Kings Lists of kings Limmu.

Relative dating - Wikipedia

Chinese Japanese Korean Vietnamese. Lunisolar Solar Lunar Astronomical year numbering. Deep time Geological history of Earth Geological time units. Chronostratigraphy Geochronology Isotope geochemistry Law of superposition Luminescence dating Samarium—neodymium dating. Amino acid racemisation Archaeomagnetic dating Dendrochronology Ice core Incremental dating Lichenometry Paleomagnetism Radiometric dating Radiocarbon Uranium—lead Potassium—argon Tephrochronology Luminescence dating Thermoluminescence dating.

Fluorine absorption Nitrogen dating Obsidian hydration Seriation Stratigraphy. Retrieved from " https: Biostratigraphy Dating methods Geochronology. Webarchive template wayback links. Views Read Edit View history. This page was last edited on 27 December , at By using this site, you agree to the Terms of Use and Privacy Policy.

Presentation on theme: "I. Principles of Relative Dating"— Presentation transcript:

Concepts Deep time Geological history of Earth Geological time units. As sediment weathers and erodes from its source, and as long as it is does not encounter any physical barriers to its movement, the sediment will be deposited in all directions until it thins or fades into a different sediment type.

For purposes of relative dating this principle is used to identify faults and erosional features within the rock record.

The principle of cross-cutting states that any geologic feature that crosses other layers or rock must be younger then the material it cuts across. Using this principle any fault or igneous intrusion must be younger than all material it or layers it crosses. Once a rock is lithified no other material can be incorporated within its internal structure. In order for any material to be included within in the rock it must have been present at the time the rock was lithified. For example, in order to get a pebble inside an igneous rock it must be incorporated when the igneous rock is still molten-- such as when lava flows over the surface.

Therefore, the piece, or inclusion, must be older than the material it is included in.