These were, at their maxima, among the most extensive glaciations in the Earth's history.

在顶峰时期，它们是地球史上最大规模的川时期。

Erosion did not stop with the end of glaciation.

侵蚀并没有随着川作的结束而停止。

Then a period of glaciation Locked up lots of Earth's water, which dramatically lowered sea levels.

然后是段川作，锁住了地球上的大量水，这大大降低了海平面。

Around 34 million years ago, the Eocene-Oligocene Transition  marked the first major period of global cooling and glaciation.

大约 3400 万年前，始新世-渐新世过渡标志着全球变川作的第要时期。

For one thing, 2.6 million years ago marked the beginning of the Pleistocene, when cooler temperatures and long periods of glaciation began to set in -– also known as the Ice Ages.

首先，260万年前标志着更新世的开始，当时气温变凉，长时间的川期开始——也就是所谓的河时代。

The end of the Devonian shows signs of a rapid swing from greenhouse to a sudden glaciation and then back again, a see-sawing of climate that could be responsible for many of the extinctions.

泥盆纪的末期显示出从温室到突然的川作快速摆动的迹象， 然后又回来了，气候的拉锯可能是许多物种灭绝的原因。

To him the two or three labored guesses that Sir Charles suggested or borrowed to explain glaciation were proof of nothing, and were quite unsolid as support for so immense a superstructure as geological uniformity.

对他来说，查尔斯爵士建议或借来解释川作的两三费力的猜测是毫无根据的，而且作为对地质均匀性如此巨大的上层建筑的支持是相当不可靠的。

Even below the waters of the lake the rock in some places is still grooved and polished; the lapping of the waves and their disintegrating action have not as yet obliterated even the superficial marks of glaciation.

即使在湖水以下，些地方的岩石仍然有凹槽抛光；海浪的拍打它们的分解作甚至还没有消除川作的表面痕迹。

Evidence for ancient glaciations in the form of distinctive scrape marks left by glaciers were found in South America, Africa, India, and Australia, all regions near the equator with current climates far too warm to sustain a glacier.

在南美洲、非洲、印度澳大利亚发现了古代川形成的证据，这些证据以川留下的独特刮痕的形式出现，这些地区都位于赤道附近，但目前的气候太温暖，无法维持川的存在。