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How did the Triassic period get its name?

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According to the Encyclopedia Britannica, the Triassic period was named after three rock layers found in central Germany that laid above the Permian layer and below the Jurassic layer. The original name "Trias" was later changed to "Triassic" as proposed by Friedrich August von Alberti in 1834.

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The Encyclopedia Britannica explains that Friedrich August von Alberti was a German palaeontologist who first identified the three different layers in the rock strata, which were later named the Bunter, Muschelkalk and Keuper. While the discovery of three different layers from the same geological period was recognized as the birth of the name of the Triassic era, it was later considered to have several drawbacks as a standard by which to assign ages or periods to rocks.

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