Xiajiabula Gr

It was named by the Coalfields Prospecting Party under the Geological Bureau of Tibet in 1958. The naming section is located at North Gully of Jiabula, Longma Region, Jiangzi County, Tibet (Liu Guifang, 1983), with its reference section being situated at the Yongyang Village (Weimei Village) on the northern bank of the Renlapu River about 20 km northeast of the Jiangzu County town (Wang Yigang and others, 1980).

Synonym: （下加不拉群）, Jiabula Fm

Lower and Middle parts of the group are composed of yellow-green siltstones and grey and dark-grey silty shales, intercalated with limestone lenses, with its basal part being composed of grey-white quartz-sandstone. Upper part is composed of black-dark grey thin-bedded shales, argillaceous siltstone and sand-, iron-, and silica-rich concretions. The thickness is 376 m.

In the North Gully of the Jiabular area the formation yields such ammonite fossils as Spiticeras spitiense, Himalayites stoliczkai, H. seideli, Euthymiceras sp., Berriasella sp., Neocomites sp., Phylloceras sp., Paraboliceras sp., Blanfordiceras sp., Virgatosphinctes sp. and Haplophylloceras strigile; and bivalve fossils such as Buchia spitiensis grandensis, Astarte spitiense, Pleuromya spitiensis and Entolium manggiongense. In the Weimei area it yields such ammonite fossils as Himalayites sp., Berriasella sp., Haplophylloceras sp. and H. strigile.