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最新的古生物学和分子生物学研究表明,动物的最早祖先应该早于埃迪卡拉纪,可能在大约635—850Ma的成冰纪就已经出现,但是缺乏可靠的化石证据。华北地台的前寒武纪沉积地层发育,前人曾在这套地层中陆续报道过大量的“后生动物化石”。然而,这些化石的动物属性均存在疑问。文中通过整理1979年以来报道过的相关化石,将其分为“水母状化石”、“遗迹化石”和“蠕虫状化石”3类,结合部分新材料的研究,分别对其形态、保存特征和最新研究进展进行评述。认为其中大部分属假化石、MISS构造或可能的藻类化石,但以下几类化石作为可能的动物化石,具有进一步研究的价值:1)辽南五行山群的水母状化石;2)辽南兴民村组的水母状化石;3)部分遗迹化石(如辽南五行山群的Skolithos、北京青白口系的遗迹化石);以及4)“淮南生物群”的蠕虫状化石。
Recent palaeontological and molecular biology studies show that the earliest ancestors of an animal should have been earlier than Eddicalam, probably at an age of about 635-850 Ma, but lack reliable evidence of fossils. Precambrian sedimentary stratums developed in the North China Platform. A large number of “epimate fossils” have been reported by predecessors in this stratum. However, the animal attributes of these fossils are in doubt. By sorting out the related fossils reported since 1979, the paper divides them into three categories: “jellyfish fossils”, “trace fossils” and “worm-shaped fossils”. Combining with the research on some new materials, Its morphology, preservation characteristics and the latest research progress. Most of them are fossil fossils or MISS structures or possible algae fossils. However, the following types of fossils are potential animal fossils: 1) jellyfish fossils from the Wuxing group in the southern part of Liaoning Province; 2) Village group of jellyfish-like fossils; 3) some trace fossils (such as the Liaodong Wuxing group of Skolithos, Beijing Qingbaikou fossils); and 4) “Huainan biota ” worm-like fossils.