侏罗纪时期 (Jurassic Period) 侏罗纪时期距今约两亿五百万到一亿四千四百万年前。
银杏有没有活着的近亲，它们的祖先可以一直追溯到侏罗纪时期。
Gingkos have no close living relatives, and their ancestry can be traced all the way back to the Jurassic period.
地质学家估计中国北部的无烟煤和烟煤煤层形成于侏罗纪时期之前。
Geologists estimate the seams of anthracite and bituminous coal in northern China, for instance, were formed from the Jurassic period onward.
第三纪和晚侏罗纪时期沉积的弱胶结粉细砂层在我国东北、南地区有广泛的分布。
Weak cemented fine quicksand layer deposited at the Tertiary Period and Jurassic Period is widely distributed in China's northeast and southwest regions.
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