恐龙最早出现在三叠纪时期的化石记录中。
They do not take over, though, until the end of the Triassic, 201m years ago.
但直至三叠纪末期恐龙才取得地球霸主地位。
That date marks one of five recognised mass extinctions in history.
历史公认的5次物种大灭绝事件之一就是以三叠纪末期为标志的。
In it, half the worlds known species disappeared.
在此期间,世界上的半数已知物种都灭绝了。
Until now, the end of the Triassic has been blamed on massive volcanic eruptions that wenton for 600,000 years.
直到现在,人们都一直将三叠纪的终结归因于持续了60万年的大规模火山喷发。
Dr Ruhl, however, reckons that was not the causeor, at least, not directly.
然而鲁尔博士却认为火山喷发不是导致三叠纪终结的原因或者至少不是直接原因。
By analysing the isotopic composition of hydrocarbon molecules from plant waxes of theperiod,
通过分析该时期植物腊的碳氢分子同位素组成,
he found what looks like a spike in the amount of recently non-biological carbon, lastingbetween 10,000 and 20,000 years.
他发现有种类似最近非生物碳的碳元素在数量上激增,这种现象持续了1万到2万年。
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