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。
这项新的研究为这片遗址确定了一个新的地质年代。
The new research pins down a new geological date for the site.
人类在地质年代表中已经存在，但时间不长。
On the geological time scale mankind has existed but for a brief moment.
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.
没有任何可靠的方法来断定大部分冰川期的地质年代。
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.
地质学家们根据地球的演化历史，设计出一种特殊的地质年代表。
Geologists have devised a special geological time scale in reference to the earth's evolution.
【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.
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.
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