在云南东北部的昭通、鲁甸、巧家、会泽及四川南部的宁南、普格、米易、金阳等县内,大箐组(或群)广泛出露,而且厚度较大。由于它是一套咸化海相或泻湖相的镁质碳酸盐沉积,生物奇缺,所以时代问题一直悬而未决。远自1942年郭文魁与业治铮先生建组以来除林宝玉报导过宁南的少量珊瑚外,一直未见有关大箐组生物与时代方面的报导。 Within the counties of Zhaotong, Ludian, Qiaojia, Huize, northeastern Yunnan and Ningnan, Puge, Miyi and Jinyang counties in the south of Sichuan, the Daban group (or group) has been widely exposed and thicker. As it is a set of magmatic carbonate deposits of a saltwater marine or lagoon, the problem of the times has been left unresolved. Far from the founding of Guo Wenkui and Mr. Ye Zhengzheng in 1942, there have been no reports about the biology and age of the Dapitan group except that Lin Baoyu reported a small amount of coral in the south of Ningxia.