When life got big

GUY M. NARBONNE

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When life got big

机译：当生活变大时

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The Ediacaran period (635 million to 542 million years ago) represents a watershed in the history of life, when 'life got big' after nearly 3 billion years of microbial evolution1. The early fossil record of large, architecturally complex, multicellular life has generally been regarded as starting with the Avalon assemblage of the Ediacara biota, known from Newfoundland, England and northwest Canada. The assemblage consists of centimetre- to metre-scale impressions of soft-bodied, fractal organisms (rangeomorphs) that first appeared 579 million years ago and dominated deep-water environments throughout the latter half of the Ediacaran2. On page 390 of this issue, Yuan and colleagues3 describe centimetre-scale algal compressions and other fossils from the early Ediacaran. They provide both a different fossil search-image and a probable extension of the oldest record of macroscopic and morphologically complex life.

机译：Ediacaran时期（6.35亿到5.42亿年前）代表着生命史上的一个分水岭，在经过近30亿年的微生物进化之后，“生命变大了” 1。人们普遍认为，早期的化石记录是大型的，结构复杂的多细胞生命，始于埃迪卡拉生物群的阿瓦隆组合，从纽芬兰，英格兰和加拿大西北部开始。该组合包括厘米级至米级的软形分形生物（rangeomorphs）印象，该印象最初出现于5.79亿年前，并在整个Ediacaran2的后半部占据着深水环境2。在本期杂志的第390页上，Yuan及其同事3描述了厘米级的藻类压缩和来自早期Ediacaran的其他化石。它们提供了不同的化石搜索图像，并可能扩展了宏观和形态复杂的生命的最古老记录。

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《Nature》 |2011年第7334期|p.339-340|共2页
作者
GUY M. NARBONNE;
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Department of Geological Sciences and Geological Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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When life got big

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