侏罗纪

This is the first reliable trematothoracin sawfly discovered in China and in the Jurassic Period.

这是首次在我国发现陷胸茎蜂化石，也是该亚科在侏罗纪首次报道。

The third period is the Jiamuhe group overmature dry gas in the late Jurassic Period to the early Cretaceous.

第三期是佳木河组过成熟干气，成藏期在侏罗纪到早白垩世。

Photo Gallery: Jurassic Period Domelike mogotes in Valle de Vi?ales National Park, Cuba, emerge from a blanket of fog.

侏罗纪时代图片。穹顶状mogotes在Valle de vi?ales国家公园，古巴，显示毯子雾。

Main macerals of hydrocarbon generation are sporinite, cutinite, alginite, bituminite, liptodetrinite and desmocollnite in source rocks from Jurassic coal measure in Northwest China.

西北地区侏罗纪煤系地层中主要生烃显微组分是孢子体、角质体、藻体、沥青质体、脂体、基质镜质体等，而树脂体、木栓质体等早期低熟生油组分含量很低。