This was towards the end of the Triassic period.
那时已是三叠纪末期。
About halfway through that period, known as the Triassic, an asteroid struck Earth.
在那段时期的中间，也就是三叠纪时期，一颗小行星撞击了地球。
Its age is late Early Triassic.
其时代为早三叠世晚期。
Source beds are turbidite of middle Triassic series.
矿源层为中三叠统浊积岩。
Source beds are turbidite of middle Triassic series.
矿源层为中三叠统浊积岩。
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