莱尔估算地质年代的方法不是很准确。
Lyell's strategy for estimation of geologic dates was not very accurate.
地质年代通常是通过矿物中发现的各种放射性元素的衰变率来获得的。
Geological dates are usually obtained by using the rates of decay of various radioactive elements found in minerals.
地质年代通常是通过矿物中发现的各种放射性元素的衰变率来获得的。
Geological dates are usually obtained by using the rates of decay of various radioactive elements found in minerals.
"从人们开始对地表的特殊岩层进行编目和分类时起，大家就开始期望能够以某种方式利用这些岩层来计算地质年代。
Ever since people had begun to catalog the strata in particular outcrops, there had been the hope that these could somehow be used to calculate geological time.
但从地质年代上来说，它还是一个婴儿。
地质年代单位、岩石地层单位、年代地层单位。
Geologic time unit, rock stratigraphic units and time stratigraphic unit.
这部分地质年代表还没有令人满意地再细分出来。
This part of geologic calendar has not been satisfactorily subdivided.
中山大学网上生物博物馆共设四个栏目：地质年代；
There are four columns by the Web's Biological Museum of Zhongshan University : Geological age;
科学家正讨论是否应正式把这个时期列入地质年代表。
Scientists are now debating whether it should be officially included in the Geological Time Scale.
千岛群岛北部的幌筵岛是在地质年代中由数座火山形成大型岛屿的一个实例。
Paramushir island in the northern Kurils is an example of a large island built by several volcanoes over geologic time.
高州群其余两个组地层的地质年代和对比则还有待进一步的研究。
As for the geologic ages and stratigraphic correlation of the remaining two formations of the Gaozhou Group, further study is required.
银河年是建立理想地质年代表的基础，每一个银河年就是一个代。
Hence it is considered that a galactic year can be based on to institute an ideal geologic time scale in which a galactic year is an era.
【考古学】后期的，近期的：所命名的地质年代后期的，与其有关的。
Upper Geology Archaeology of, relating to, or being a later division of the period named.
国际地层委员会提出将在近年内完成各地质年代中阶间界线层型的选定工作。
The International Commission on Stratigraphy proposed that all stratotypes between the chronostratigraphic stages should be selected in the coming years.
经过漫长地质年代的溶滤作用是控制深层地下水中氟含量的主要地球化学作用。
Lixiviation is chief geochemistry action to control fluorine content undergo very long geological age.
地震地貌学强调在相对地质年代域中对沉积体成像，表征了地震相的平面反射形态。
Seismic geomorphology emphasizes the imaging of sedimentary bodies in relative geologic age domain, and characterizes the plane reflection pattern of seismic facies.
同样，在日常生活中，你是无法看透这个逐渐演化的地质年代或者是DNA的盘旋曲折。
It's equally hard to fathom the ages of geological time that drive evolution or to directly see the folding and unfolding of DNA on an everyday basis.
丰富多样的化石的突然出现为在世界范围内把地质年代划分为两大主要部份提供了时间界限。
The sudden appearance of abundant and varied fossils makes a worldwide time line for dividing the geological time scale into two main parts.
用地质年代表(表1)中的不同年代的编号1 -6，来代表每个描述所出现的地质年代。
Using the codes 1 to 6 representing the different time periods in the evolutionary time scale shown in Figure 1, indicate the geologic time period that best corresponds to each description.
加州大学的地质年代学家们发现，戈纳石器正是在标志更新世开端的那次磁场逆转发生之前制造的。
Geochronologists at the University of California found that the stone tools from Gona were made just before the magnetic field shift which began the Matayama epoch.
对沽源-多伦盆地火山岩类和花岗岩类进行了同位素地质年代学、地球化学和铀成矿条件的系统研究。
The results of systematic studies of geochronology, geochemistry and uranium metallogenic condition of volcanic rocks and granites in Guyuan-Duolun Basin are reported.
在整个地质年代中，浮游生物随地质时代的变化用于估计含己成为化石的浮游生物残体的岩石的相对年代很有用。
The changes in plankton over time are useful for estimation of relative ages of rocks that contain the fossilized remains of plankton.
部分地层的古地磁和ESR测年数据与2000年公布的地质年代数据基本吻合，可以作为年代地层划分的辅助依据。
Some paleomagnetic data and ESR dating data coincide with geochronometer published in 2000, and may be regarded as subsidiary basis for chronostratigraphic classification.
同时因为计算与实验室的实验复制的金星地表与大气层的活动，表明辐射率一直在下降，所以辐射率能够成为某个地质年代的一个重要指标。
Because calculations and lab experiments replicating the Venusian surface and atmosphere show that emissivity decreases over time, emissivity can be an important indicator of a substance's age.
地质学家关注沉积物，通过它们地质学家可以揭示过去，特别是在地球从一个地质年代跨越到另一个地质年代时那些巨大的时间跨度。
Geologists care about sediments, hammering away at them to uncover what they have to say about the past-especially the huge spans of time as the Earth passes from one geological period to another.
《宇宙连环画》中变来变去的主人公Qfwfq巧妙的穿越时间，空间，太阳系和地质年代，在这些新的故事中又以崭新的面目出现。
Qfwfq, the protean hero of Cosmicomics dexterously moving through time and space, solar systems and geological eras, takes on a new dimension in these tales.
同位素地质年代学是测量年龄，利率，和历史或行星的地质资料的一门科学，运用这些见解的过程和现象可以了解地球与行星科学系。
Geochronology is the science of measuring ages, rates, and histories of geologic or planetary materials, and using these insights to understand processes and phenomena in earth and planetary science.
同位素地质年代学是测量年龄，利率，和历史或行星的地质资料的一门科学，运用这些见解的过程和现象可以了解地球与行星科学系。
Geochronology is the science of measuring ages, rates, and histories of geologic or planetary materials, and using these insights to understand processes and phenomena in earth and planetary science.
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