查尔斯·莱尔根据化石记录对第三纪作出了很好的估计，但他的方法不能扩展到更早的地质时期。
Charles Lyell made a good estimate of the Tertiary Period from the fossil record, but his method could not be extended to earlier geological periods.
最后一次冰川作用的漂浮物沉积在最近的其中一个地质时期——更新世，这段时期从180万年前持续到1万年前。
The drift of the last glaciation was deposited during one of the most recent epochs of geologic time, the Pleistocene, which lasted from 1.8 million to 10,000 years ago.
作为地质学家，我们研究地球表面的沉积层以估算过去地质时期的年代。
As geologists, we examine layers of sediment on the Earth' s surface to approximate the dates of past geologic time periods.
硬鳞鱼在更早的地质时期数量巨大。
Ganoid fishes swarmed during the earlier geological periods.
在整个地质时期，它们随着自然地气候循环减小或涨大。
Over geologic time, they have ebbed and flowed with natural climate cycles.
根据最新的地质时期表，泛古陆存在于2亿至5.5亿年前。
Pangea existed between 550 and 200 million years ago--which is relatively recent in geological time.
人类造成的突变(以地质时期为尺度衡量)，其证据触目惊心。
Evidence of abrupt change — on a geological time scale — wrought by human hands would seem to be overwhelming.
对于冰川对变暖世界的回应，以前的地质时期也出现过相似的状况。
For the response of the ice sheets to a still warmer world, older periods in geologic time offer parallels.
劳克林说，在讨论气候变化问题时，必须对比过去地质时期的情况。
You can't discuss climate change, Prof. Laughlin says, without looking backward across geologic time.
古地温曲线是岩石圈在特定地质时期热结构的集中体现。
Paleogeotherm is important for understanding the thermal structure of lithosphere at a specific geological time.
利用盆地模拟技术模拟烃源岩各地质时期的热演化阶段。
It USES basin simulation technique to simulate the heat evolution stages of various geologic period of hydrocarbon source rock.
地球的历史包含着许多不如全新世稳定与温和的地质时期。
The planet's history contains many less stable and clement eras than the holocene.
Paleoclimate -古气候指的是古代地质时期的气候条件。
Paleoclimate the climate conditions of geologic periods in the ancient past.
从这里可以点击进入各个地质时期，并伴有文字和图表说明。
There are clickable links to each geological period providing accompanying text and graphics.
在某些地质时期还与幔源岩浆的底垫对地壳或岩石圈的改造有关。
Some times in the process there was reworking of diapir of mantle-sourced magma on the crust or lithosphere.
没什么用处或者适应能力差的生物遭受冷遇：灭绝率远高于正常地质时期的时候。
Creatures less useful or adaptable get short shrift: the extinction rate is running far higher than during normal geological periods.
恐龙以及恐龙的消失是侏罗纪的标志，人类或许也会像它们那样定义一个地质时期。
Human may define a geological period in the way dinosaurs — and their vanishing act — helped mark the Jurassic.
在过来不同的地质时期，许多的物种由于自然作用而非人类行为而灭绝。
At various times in the geological past, many species have become extinct as a result of natural, rather than human, processes.
在过去不同的地质时期，许多的物种因为自然作用而非人类行为而灭绝。
At various times in the geological past, many species have become extinct as a result of natural, rather than human, processes.
科学家称人类开始对全球水系统造成重大破坏，一个新的地质时期由此开始了。
Scientists say a new geologic epoch has begun whereby humans are causing major damage to global water systems.
事实上，他们给这种人类活动引起的非正式地质时期起了个名字—“人类纪”。
In fact, there's a name for the informal geologic epoch they say human activity has caused — the Anthropocene.
影响地质时期的大地震虽然在人类的历史中非常罕见，但该地区地震活动自古以来就非常频繁。
Although rare on human timescales, over geologic time earthquakes are frequent in the area.
这里有大量的化石，而且大峡谷的峭壁上为我们提供了四个主要地质时期中的三个时期的信息。
There is a huge amount of fossil evidence. And its walls provide a record of three of the four major periods of the Earth's geologic time.
尽管在过去地质时期地磁场发生了多次倒转，但要预测下次倒转将在何时发生也还是不可能的。
Although magnetic reversals have occurred many times in the geologic past, it is not yet possible to predict when the next reversal will occur.
人天生就具有好奇心，我们对我们居住的地球以及在整个地质时期发生的各种改变都非常感兴趣。
Humans are by nature curious, and we are all interested in the Earth on which we live and how various aspects have changed through geologic time.
至少在过去的5亿年中的一部分时间内，地球上的物种的50%到90%以上已经在地质时期的一瞬间内消失了。
At least a handful of times in the last 500 million years, 50 to more than 90 percent of all species on Earth have disappeared in a geological blink of the eye.
遗迹相是指一组具有特征的遗迹化石组合，在一段相当长的地质时期中不断的重视以及它们的环境意义。
The ichnofacies is the grouping of characteristic trace fossil association tending to rscirrence through a rather long interval of geologic time, and their environmental implication.
研究表明，不同地质时期应力强度不同，应力的方向和大小都有变化，认为应力值由老到新呈增大趋势。
Study indicates that the intensity, direction and magnitude of stress vary in different geologic periods. The stress values show a trend of increase from the old to young formations.
中生代是地质时期的第二个大时代，从大约2.25亿年前的古生代末延续到约7千亿年前的第三纪初。
The second major era of geological time which lasted from the end of the Palaeozoic era about 225 million years ago, to the start of the Tertiary, some 70 million years ago.
中生代是地质时期的第二个大时代，从大约2.25亿年前的古生代末延续到约7千亿年前的第三纪初。
The second major era of geological time which lasted from the end of the Palaeozoic era about 225 million years ago, to the start of the Tertiary, some 70 million years ago.
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