在中国进行研究工作的两个科学家小组发现了据认为迄今为止最古老的复合动物化石。科学家认为这些化石至少是5．7亿年前的小动物软体化石，这些化石可能是许多年来最重要的发现之一。这一发现，对于科学家研究地球早期生物发展很有帮助。这两个小组一组是以北京大学和哈佛大学 Two groups of scientists working on research in China found the oldest complex animal fossils believed to date. Scientists believe these fossils are at least 570 million years ago, small animal molluscs, these fossils may be one of the most important discovery in many years. This finding is very helpful for scientists to study the early development of the earth. The two groups are based on Peking University and Harvard University