Paleozoic

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  • Paleozoic
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Abstract from DBPedia
    The Paleozoic (or Palaeozoic) Era is the earliest of three geologic eras of the Phanerozoic Eon.The name Paleozoic ( /ˌpæli.əˈzoʊ.ɪk, -i.oʊ-, ˌpeɪ-/ pal-ee-ə-ZOH-ik, -⁠ee-oh-, pay-;) was coined by the British geologist Adam Sedgwick in 1838by combining the Greek words palaiós (παλαιός, "old") and zōḗ (ζωή), "life", meaning "ancient life"). It is the longest of the Phanerozoic eras, lasting from 538.8 to 251.902 million years ago, and is subdivided into six geologic periods (from oldest to youngest): 1. * Cambrian 2. * Ordovician 3. * Silurian 4. * Devonian 5. * Carboniferous 6. * Permian The Paleozoic comes after the Neoproterozoic Era of the Proterozoic Eon and is followed by the Mesozoic Era. The Paleozoic was a time of dramatic geological, climatic, and evolutionary change. The Cambrian witnessed the most rapid and widespread diversification of life in Earth's history, known as the Cambrian explosion, in which most modern phyla first appeared. Arthropods, molluscs, fish, amphibians, synapsids, and diapsids all evolved during the Paleozoic. Life began in the ocean but eventually transitioned onto land, and by the late Paleozoic, great forests of primitive plants covered the continents, many of which formed the coal beds of Europe and eastern North America. Towards the end of the era, large, sophisticated synapsids and diapsids were dominant and the first modern plants (conifers) appeared. The Paleozoic Era ended with the largest extinction event of the Phanerozoic Eon, the Permian–Triassic extinction event. The effects of this catastrophe were so devastating that it took life on land 30 million years into the Mesozoic Era to recover.Recovery of life in the sea may have been much faster.

    古生代(こせいだい、仏: Paléozoïque、英: Paleozoic era)は、古生代・中生代・新生代と分かれる地質時代の大きな区分の一つである。約5億4100万 - 約2億5190万年前。先カンブリア時代(隠生代)の後に相当する。地質学的には、古生代以前の地質年代をはっきりと確定することはできない。無脊椎動物の繁栄から、恐竜が繁栄しはじめる中生代の手前までの期間に対応する。

    (Source: http://dbpedia.org/resource/Paleozoic)