Microbial sedimentation was widespread in the Precambrian and was also developed in stromatolitic carbonate horizons of the Phanerozoic, which constitute one type of microbial carbonates.
微生物沉积作用在前寒武纪地层中普遍发育，在显生宙的一些地层中也较为发育。
These findings are not of Precambrian animals themselves, but of their tracks.
发现的并不是前寒武纪的动物本身，而是它们的足迹。
Precambrian geology is one of the major research fields of earth sciences.
前寒武纪地质学是地球科学的主要研究领域之一。
There are abundant mineral resources in the Precambrian rock formations, on which the survival and development of mankind depend.
在前寒武纪岩层中蕴藏着丰富的矿藏，为人类的生存和发展提供了大量的有用资源。
This discovery has great significance for the intensive study of the Precambrian tectonic evolution of the area.
这一发现对深化研究该地区前寒武纪地质构造演化历史具有重要意义。
Of, belonging to, or designating the earlier of two divisions of the Precambrian era.
早期前寒武纪前寒武纪的两期中较早的一期的，属于它的或以其命名的
Northern Guangxi is an ideal region not only for research of Precambrian stratigraphy but also for...
桂北是华南前寒武纪地层研究的理想地区之一，同时也是研究华南地壳演化和前寒武纪大地构造性质的最佳地区之一。
Among them the Precambrian and Cenozoic eras are the main metallogenic epoches in the world.
就全球而言，前寒武纪和新生代是金矿的重要成矿期。
However, the Precambrian sedimentary rocks are so minor that they cannot reveal the shape of the old blocks.
这一现象不但是地壳演化的普遍规律，而且也可反过来用沉积岩反映陆壳的演化。
Organic matter, pH, cation exchange capacity and contents of potassium, sodium, magnesium, copper, zinc, manganese, cobalt, iron, selenium, iodin and fluorin were determined of rock and soil samples from six main geological background areas within the main ruminant production base, in Yunnan Province, China. Results showed: 1 the red earth area of Paleozoic basalt and red earth area of carbonate the highest; the yellow-red earth area of mixture of carbonate, clasolite and basalt follows, except for its content of Co, which is relatively lower; and the purple earth area of Mesozoic clasolite, the yellow-red earth area of clasolite and the dark red earth area of Precambrian metamorphite are the lowest
对云南省反刍动物生产基地所属的6个主要地质背景区的土壤和岩石样品的K、Na、Mg、Cu、Zn、Mn、Co、Fe、Se、I和F元素及土壤的有机质、阳离子交换量和pH进行测定分析，结果表明：晚古生代玄武岩红壤区和碳酸岩盐红壤区土壤各种矿质元素都比较高，有机质含量与CEC都较高，特别是Ⅴ区最为显著；碳酸岩盐、碎屑岩和玄武岩混合型黄红壤区除了Co含量较低外，其他元素含量都居中等或偏上水平，有机质含量与CEC仅次于第1类背景区；碎屑岩紫色土区、变质岩赤红壤区和碎屑岩黄红壤区大多数矿质养分相对都比较低，有机质含量与CEC最低。
More importantly, this succession was formed during the stromatolitic golden age, which provides useful information for the further understanding of the evolving carbonate world of the Precambrian.
因此，这些现象将特别有助于对前寒武纪非叠层石生态系所造成的另一类席底生境的深入理解，也有助于复杂多变的碳酸盐岩世界。
Spindle-shaped cracks and the other mat-ground structures provide an important evidence to reconstruct the sedimentary environment of the Precambrian. These structures also illuminate the metabolism diversity and enormous biomass of microbes in the Precambrian on the earth surface, and thus form important marks in the sedimentary records.
纺锤状裂缝与其他的席底构造一样，为前寒武纪的沉积环境重塑提供了一个重要的证据，同时也说明在前寒武纪的地球表层环境中，微生物以其新陈代谢的多样性及巨大的生物量，在沉积纪录中留下了重要的烙印。
Based on the deep discussion about the division case of precambrian strata, the anthor has agreed with the case that the original Fenzishan group and Jingshan group combine into Jingshan-fenz isbn group.
对本区前寒武纪的地层划分方案进行了综合分析和讨论，同意将粉子山群和荆山群归并为荆山—粉子山群的划分方案。
Based on major and trace elements and isotope geochemical data, it is inferred that Sandouding suite is formed by magma melting of Late Archeozoic continent tholeiite source, and its geochemical variation is controlled by hornblende fractional crystallization. Besides fractional crystallization, the geochemical variation of Huanglingmiao suite is related to the mixing between dacitic magma and felsic magma. Dalaoling suite is probably derived from early Precambrian volcanics.
根据岩石化学和同位素组成推断，三斗坪岩套的源岩主要是晚太古代大陆拉斑玄武岩，母岩浆相当于英安质，岩套内的成分变化主要受角闪石分离结晶作用控制；黄陵庙岩套除受分离结晶作用影响外，成分变化主要与英安质母岩浆和某种长英质岩浆的混合有关；大老岭岩套的源岩亦为早前寒武纪火山岩。
And, at several spots on the planet, the Ediacaran lagerst? tten, named after the Ediacara Hills of Australia where the first example was found, harbor strange Precambrian soft-bodied fossils and animal burrows, including evidence for early bilaterians.
而分布在地球上数个地区的艾迪卡拉特异埋藏点（命名自首次发现的澳洲艾迪卡拉山），里面藏有奇妙的前寒武纪软体化石与虫穴，包括早期两侧对称动物的证据。
The dating results of captured zircons show that the Middle-Late Jurassic (155-169 Ma), Indosinian (218-236 Ma), Hercynian (254 Ma, 294 Ma), Caledonian (413 Ma), and Precambrian (1823 Ma and 2542 Ma) magmatic events had taken place in the basin basement, which is consistent with the zircon U-Pb dating results from the basin basement rocks.
捕获锆石的定年结果显示，本区基底中存在中晚侏罗世(155~169 Ma)、印支期(218~236Ma)、海西期(254 Ma、294 Ma)、加里东期(413 Ma)和前寒武纪（1823 Ma 和2542 Ma）岩浆事件，这与基底岩石中锆石U-Pb的定年结果相吻合。
The ε(322Ma) values of two wolframite separates from the greisen massive ore range from 4.24 to 5.93, much higher than values of the ancient continental crust and Precambrian metamorphic rocks.
相比之下，黄玉－石英脉型钨矿石中5件黑钨矿样品的ε(322Ma)值变化范围为-4.16~-8.05，与同时期古大陆壳钕同位素演化线值相似。
Usually the archeozoic and Proterozoic eras are grouped together and referred to as Precambrian in age. Precambrian rocks have been intensely deformed, metamorphosed and intruded, and are relatively barren of fossil s.
通常太古代和元古代被归在一起而称作前寒武纪，前寒武纪的岩石多遭受强烈变形、变质或被岩浆岩侵入，岩石中缺少化石。
Usually the archeozoic and Proterozoic eras are grouped together and referred to as Precambrian in age. Precambrian rocks have been intensely deformed, metamorphosed and intrude d, and are relatively barren of fossils.
通常太古代和元古代被归在一起而称作前寒武纪，前寒武纪的岩石多遭受强烈变形、变质或被岩浆岩侵入，岩石中缺少化石。
This may imply that the anaerobic event seems to have little bearing on the mass extinction near the Precambrian/Cambrian boundary, whereas the intense negative carbon isotopic anomaly event appears to be more closely related to the mass extinction occurring near the Precambrian/Cambrian boundary.
可以说缺氧事件对前寒武系寒武系界线附近生物绝灭事件似乎没有很大的影响，而碳同位素强烈的负异常事件与前寒武系-寒武系界线附近生物大绝灭关系更为密切。