Muggarkangri Gr

It was named by Wen Shixuan in 1979. The naming section is located on the southeastern Muggargeberi slope of the main Muggarkangri Peak northwest of Nymar, Tibet (E 87°30′, N 32°20′), with its reference section being situated in the Lata Gully north of the Gaizedong Co, Tibet (E 85°00′, N 32°10′ => between TJ38 and TJ39 in North Lhasa or South Qiangtang block?)

Synonym: （木嘎岗日群）, Muggar Kangri Gr.

In the area of the Muggarkangri Peak the formation represents an alternating layer of dark-grey to grey-black argillaceous slates, intercalated with siliceous limestones, limestone lenses and grey-green metamorphosed poststones (= fine-grained sandstone) in association with silty mudstones, with a thickness of more than 2200 m. In the area of the Gaizedong Co, the Lower part of the formation is composed of grey-green tuffs, tuffaceous sandstones, grey sandstones, intercalated with microcrystalline limestones and grey-green tuffaceous sandstones; with its Middle part consisting of light-grey thick-bedded crystalline limestones, grey-green tuffs, intercalated with limestones and grey-black bioclastic limestones, yielding bivalve, Gastropoda, coral, algae and sponge fossils; and with its Upper part being composed of several rhythmic units of grey and yellow-grey sandstones, siltstones and shales, intercalated with grey-green tuffs. Its thickness is of over 1580 m.

In the Muggarkangri and the Dong Co areas, it yields coral fossils as represented by Pleisionsmilia cf. truncata; bivalve fossils such as Modiolus sp.; Gastropoda fossils comprising such middle and late Jurassic members as Burmihynchia cf. shanensis and B. cf. luchiangensis, while in other regions it yields coral fossils such as Montlivaltia sp., Thecosmilia sp., T. cf. shuanghuensis, Stylina cf. donggoensis and Fungiastrea multicincta.