The duration of previous geologic periods was difficult to determine.
以前很难确定地质期的持续时间。
Lyell's strategy for estimation of geologic dates was not very accurate.
莱尔估算地质年代的方法不是很准确。
Many scientists provided valuable research and input into the creation of the geologic time scale.
许多科学家为地质时间尺度的建立提供了有价值的研究和投入。
Three very large volcanoes are found on the Tharsis bulge, an enormous geologic area near Mars's equator.
在塔尔西斯高原上发现了三座非常大的火山。塔尔西斯高原是火星赤道附近一片广阔的地质区域。
Ocean sediments presented a much more complete geologic record of the Pleistocene than continental glacial deposits did.
相比于大陆冰川沉积物，海洋沉积物提供了更完整的更新世时期的地质记录。
As geologists, we examine layers of sediment on the Earth' s surface to approximate the dates of past geologic time periods.
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。
Now, this apparent contradiction between geologic evidence and the stellar evolution model became known as the faint young Sun paradox.
现在，地质证据和恒星演化模型之间这种明显的矛盾被称为“微弱年轻太阳悖论”。
An objective of this particular cruise was to investigate the floor of the Mediterranean and to resolve questions about its geologic history.
这次特别巡航的目的之一是调查地中海的海床，并解决有关其地质历史的问题。
Today I want to talk about a way in which we are able to determine how old a piece of land, or some other geologic feature is—dating techniques.
今天我想谈谈一种使我们能够确定一块土地或其他一些地质特征的年代的方法——年代测定技术。
Attack by scavengers and bacteria, chemical decay, and destruction by erosion and other geologic agencies make the odds against preservation very high.
食腐动物和细菌的攻击、化学性腐烂，以及侵蚀和其他地质作用的破坏，导致无法保存的可能性非常大。
The surface of Mars shows a wide range of geologic features, including huge volcanoes—the largest known in the solar system—and extensive impact cratering.
火星表面显示出广泛的地质特征，包括巨大的火山——太阳系中已知的最大的火山——和广阔的撞击坑。
Recent geologic evidence indicates that contrary to what had been believed, substantial areas along the coast were free of ice as early as 16,000 years ago.
最近的地质证据表明，早在16,000年前，沿海岸的大部分地区就没有冰了，这与人们过去的看法相反。
A few astronomers thought they could see even more of a dinosaur-cosmos link, a pattern of mass extinctions occurring like clockwork in the geologic record.
一些天文学家认为他们可以看到更多的恐龙与宇宙之间的联系，这种大规模灭绝的模式就像地质记录上的时钟一样。
More than 20,000 apartments in France are now heated by warm underground water drawn from a heat reservoir in a geologic structure near Paris called the Paris Basin.
目前在法国，有超过2万套的公寓是由温暖的地下水供暖的，这些地下水来自一个叫做巴黎盆地的地质构造的热储，位于巴黎附近。
Massive projectiles striking much larger bodies create various kinds of craters, including multi-ring basins—the largest geologic features observed on planets and moons.
巨大的抛射物撞击更大的天体，创造了各种各样的陨石坑，包括多环盆地——这是在行星和卫星上观察到的最大的地质特征。
More recent geologic studies documented deglaciation and the existence of ice-free areas throughout major coastal areas of British Columbia, Canada, by 13,000 years ago.
更多近期的地质研究证明了13000年前的冰川消退现象和整个加拿大不列颠哥伦比亚省主要沿海地区内无冰区的存在。
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.
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。
Massive projectiles striking much larger bodies create various kinds of craters, including "multi-ring basins"—the largest geologic features observed on planets and moons.
大量的抛射物撞击更大的天体，形成各种各样的陨石坑，包括“多环盆地”——在行星和卫星上观察到的最大的地质特征。
Geologic evidence shows that southern African has been slowly rising for the past 100 million years, yet it has not experienced a tectonic collision for nearly 400 million years.
地质证据显示，非洲南部的板块在过去的1亿年里一直在缓慢地上升，然而它在近4亿年里没有经历过一次构造碰撞。
There is growing evidence that the presence of humans has altered the Earth so much that a new Epoch of geologic history has begun—the Anthropocene Epoch, a new human-influenced Epoch.
有越来越多的证据表明，人类的存在使地球发生了巨大的变化，地质史上的一个新时代已经开始了——即人世时代，一个受人类影响的新时代。
The best gauge of quake risk is the geologic record.
我们最好的测量地震风险的办法是地质记录。
There are fundamental geologic forces that created those numbers.
基本的地理力量制造出了这些数据。
A 2008 study described the complex geologic history of Oslofjorden.
2008年，一项研究从地质学上揭示了奥斯陆峡湾错综复杂的过去。
Paleoclimate the climate conditions of geologic periods in the ancient past.
Paleoclimate -古气候指的是古代地质时期的气候条件。
Less ice covers the Arctic today than at any time in recent geologic history.
今天的北极冰层比近代地质史上任何时期都少。
Over geologic time, they have ebbed and flowed with natural climate cycles.
在整个地质时期，它们随着自然地气候循环减小或涨大。
"To see an active geologic process on Mars today is cool, " said Hansen-Koharcheck.
Hansen-Koharcheck说：“观看现今火星上活跃的地质变化过程是一件很酷的事情。”
As he explains, the Geologic Time Scale is largely based on the stratigraphic record.
他解释说，地质时间尺度很大程度上基于对地层的记录。
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