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geochronology
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Morrison Formation
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geochronology Article

geochronology summary

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Below is the article summary. For the full article, see geochronology.
geologic time
geologic timeThe stratigraphic chart of geologic time.

geochronology, Dating and interpretation of geologic events in the history of the Earth. The classical technique of geochronology was stratigraphy, including faunal succession. Since the mid 20th century, radiometric dating has provided absolute age data to supplement the relative dates obtained from the fossil record. Radiometric dating is based on the principle that radioactive isotopes in geologic material decay at constant, known rates to daughter isotopes. See also carbon-14 dating.

Morrison Formation
dating Summary
Dating, in geology, determining a chronology or calendar of events in the history of Earth, using to a large degree the evidence of organic evolution in the sedimentary rocks accumulated through geologic time in marine and continental environments. To date past events, processes, formations, and