Precambrian animals must therefore have lived at such depths.
因此，前寒武纪的动物肯定曾经生活在这么深的地方。
The first three eons, which together lasted nearly 4 billion years, are together known as the Precambrian.
前三个时期合起来持续了40亿年，合称为前寒武纪（隐生宙）。
Although named after a site in Australia, the Ediacaran formation is worldwide in distribution and dates to Precambrian times.
尽管伊迪卡拉是以澳大利亚的一处地名而命名，但伊迪卡拉沉积层却遍及世界各地，并且可追溯到前寒武纪时代。
它们是前寒武纪岩石。
Precambrian metamorphic rocks constituted the basin basement.
盆地的基底是前寒武系变质岩。
They are important structural features in the Precambrian metamorphic rocks.
它是前寒武纪变质岩内一种重要的构造现象。
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。
Early - Precambrian rocks are widely exposed in Dunhuang - Beishan area, GansuProvince.
甘肃敦煌-北山地区广泛出露早前寒武纪岩石。
The Precambrian-Cambrian transition is one of the critical time intervals in Earth history.
震旦-寒武交变期是地史上一个重大转折期，亦是一个具有特殊意义的过渡时期。
The pyrite type Cu-Au-deposit is located in the ophiolite suite of the Precambrian Bikou Group.
碧口群黄铁矿型铜金矿床产于前震旦纪古蛇绿岩套中。矿体受一定层位控制，分段集中，成群分布；
Two main glacial epochs affected both areas during the last 100 million years of Precambrian times.
在前寒武纪的最后1亿年中，两个主要的冰川时期对两个地区都产生了影响。
Precambrian BIF iron ore deposit can be divided into two types, Algoma-type and Lake Superior-type.
前寒武纪条带状含铁建造铁矿床分为阿尔戈马型和苏必利尔湖型两大类。
The Mashan group and Heilongjiang group are major components of the base of Precambrian Jiamusi block.
麻山群和黑龙江群是佳木斯地块前寒武纪基底的重要组成。
Precambrian rocks are described as "basement rocks" because they are usually buried deep under the surface.
前寒武纪岩石被称为基岩，因为它们通常深埋于地表之下。
This research also reveals that susceptibility can be used as a palaeoclimate proxy for Precambrian successions.
研究结果还表明磁化率能够作为前寒武纪的古气候替代性指标。
Chemical fossils (e. g. alkanes and porphyrins) are often the only evidence for life in rocks of PRECAMBRIAN age.
化学化石(烷烃和卟啉)是前寒武纪地层中生命存在的唯一证据。
The Liaoji Paleoproterozoic fold zone is an important fold-orogenic and metallogenic zone in the early Precambrian.
辽吉古元古宙褶皱带是早前寒武纪时期的一条重要的褶皱造山带与成矿带。
It is thought that the original crust, especially the metamorphose basement of Precambrian is the base of gold-ore formation.
初始地壳，尤其是前寒武纪的变质基底是金矿密集区形成的物质基础。
The rocks coexist closely, distributing in a narrow and long belt in the Late Precambrian orogenic belt in northern Liaoning.
它们紧密共生，呈狭长的带状分布于辽宁北部晚前寒武纪造山带内。
This study supplies new geological data for research of the early Precambrian crust growth and tectonic evolution of Western Kunlun.
这对研究西昆仑山早前寒武纪陆壳增生及构造演化提供了重要的地质资料。
The above-mentioned results are of significance for further study of Precambrian structures and magmatic evolution in Fujian Province.
这一最新成果对进一步研究我省前寒武纪构造及岩浆演化具有重要意义。
The Hengshan high-grade metamorphic terrain is one of the typical areas for the study of Early Precambrian metamorphic rocks in China.
恒山高级变质岩区是中国早前寒武纪变质岩研究的经典地区之一。
An era of geologic time, from the end of the Precambrian to the beginning of the Mesozoic, or from about 570 to about 225 million years ago.
古生代是地质时期的一个时代，从前寒武纪末开始，到中生代初，大约从5.7亿年前到2.25亿年前。
The existence of the undeformed and unmetamorphed Precambrian dike swarms shows that the Precambrian North China Craton had been a rigid plate.
未变形未变质的前寒武纪岩墙群的存在表明前寒武纪华北克拉通已经具有了刚性板块的性质。
Stromatolite and molar-tooth structures are two kinds of peculiar Precambrian sedimentary phenomena, attracting great attention from geologists.
叠层石和臼齿构造是前寒武纪较为引人注目的两种沉积现象。
Z-shaped superposed folds formed by nearly vertical gneiss and feldspar-quartz veins are widely developed in East Qinling Precambrian metamorphic rocks.
在东秦岭前寒武系变质岩中，发育了许多Z字型叠加褶皱。它们是由近直立的片麻岩和长英质脉形成的。
The Qingyi ductile shear zone (QDSZ) developed in Late Archean is a large-size ductile shear zone in granite of the western Shandong Precambrian basement.
青邑韧性剪切带是晚太古代末期发育在鲁西前寒武纪基底花岗岩中一条规模较大的韧性剪切带。
Gold deposit in Precambrian banded iron formation is an important type of gold ore, which has been paid more attention by many domestic or alien geologist.
前寒武纪铁建造中的金矿床是世界上一种重要的金矿类型，深受国内外地质工作者的重视。
The early Precambrian in Jilin province includes the Archaeozoic granite-greenstone belt, early Proterozoic Ji'an Group and mid Proterozoic Laoling Group .
吉林省早前寒武纪地质包括太古宙花岗—绿岩带、早元古代集安群和中元古代老岭群。
The early Precambrian in Jilin province includes the Archaeozoic granite-greenstone belt, early Proterozoic Ji 'an Group and mid Proterozoic Laoling Group.
吉林省早前寒武纪地质包括太古宙花岗—绿岩带、早元古代集安群和中元古代老岭群。
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