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西藏江孜地区加不拉的白垩纪地层,是一套厚达几千米的深水相碎屑岩沉积。前人将其划分为白垩系下统加不拉群或加不拉组,上统宗卓群或宗卓组,其下与晚侏罗世地层为连续沉积。此地层剖面出露较好,化石也较丰富。自1957年西藏地质局煤田地质队靳毓贵等人首先发现该剖面以来,先后曾有中国科学院西藏综合考察队地质组(1960),西藏地质局顾庆阁等(1962),中国科学院西藏科学考察队(1968),中国地质科学院西藏地质
The Cretaceous strata, Jiabula, Gyangze, Tibet, are a set of deep-water clastic sediments up to several kilometers thick. The predecessors divided them into the Cretaceous Xiabujian or Jiabula group, the Zongzhuo group or the Zongzhuo formation, and the lower and Late Jurassic strata are continuously deposited. This stratum profiles exposed better fossils are also more abundant. Since the discovery of the profile by the geological team of the Geological Bureau of Tibet in 1957, Jin Yugui et al. Have successively collected the geological survey team of the Chinese Academy of Sciences (1960), the Geological Bureau of the Tibet Plateau (1962), the Tibetan Science Expedition Team of the Chinese Academy of Sciences (1968 ), Tibetan Geology, Chinese Academy of Geological Sciences