侏罗纪

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

这是首次我国发现可靠的陷胸茎蜂化石，也是该亚罗纪的首次报道。

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.

罗纪时代图片。穹顶状的mogotesValle de vi?ales国家公园，古巴，显示毯的雾。

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

西北地区罗纪煤系地层中主要的生烃显微组分是、角质、藻类、沥青质、碎屑类脂、基质镜质等，而树脂、木栓质等早期低熟生油组分含量很低。