属于显生宙的一个地质时代,包含寒武纪、奥陶纪、志留纪、泥盆纪、石炭纪和二叠纪,约5.42亿至2.5亿年前,从三叶虫时代到爬行动物时代。
属于显生宙的一个地质时代,包含寒武纪、奥陶纪、志留纪、泥盆纪、石炭纪和二叠纪,约5.42亿至2.5亿年前,从三叶虫时代到爬行动物时代。
属于显生宙的一个地质时代,包含寒武纪、奥陶纪、志留纪、泥盆纪、石炭纪和二叠纪,约5.42亿至2.5亿年前,从三叶虫时代到爬行动物时代。
Of a geologic era within the Phanerozoic eon that comprises the Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian periods from about 542 to 250 million years ago, from the age of trilobites to that of reptiles.
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