The geologic time scale GTS is a system of chronological dating that classifies geological strata stratigraphy in time. It is used by geologists , paleontologists , and other Earth scientists to describe the timing and relationships of events in geologic history. The time scale was developed through the study of physical rock layers and relationships as well as the times when different organisms appeared, evolved and became extinct through the study of fossilized remains and imprints. The table of geologic time spans, presented here, agrees with the nomenclature , dates and standard color codes set forth by the International Commission on Stratigraphy ICS.
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The Late Devonian extinction was one of five major extinction events in the history of life on Earth. A major extinction, the Kellwasser event , occurred at the boundary that marks the beginning of the last phase of the Devonian period, the Famennian faunal stage the Frasnian—Famennian boundary , about — million years ago. Although it is clear that there was a massive loss of biodiversity in the Late Devonian, the timespan of this event is uncertain, with estimates ranging from , to 25 million years, extending from the mid-Givetian to the end-Famennian. By the Late Devonian, the land had been colonized by plants and insects. In the oceans, massive reefs were built by corals and stromatoporoids. Euramerica and Gondwana were beginning to converge into what would become Pangaea.
Geologic time scale
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