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A fusuline fauna consisting of 9 species of 4 genera from the Xiala Formation of the Mujiucuo section, Xainza County, Tibet, China is described. The fusuline fauna is dominated by Nankinella and Chusenella and indicates a Midian (Late Guadalupian) age. The earliest record of fusuline fauna during the Midian in the Lhasa Block suggests that the block rifted later than the Qiangtang Block to the north and the Baoshan and Tengchong blocks to the east, all of which yield much earlier fusuline faunas of Yakhtashian (Artinskian) age, but had drifted away from Gondwana to a relatively warm temperate zone in the Late Guadalupian (Middle Permian). [ABSTRACT FROM AUTHOR]

Focuses on the proposal of a new subfamily of Lyttoniidae Waagen from the genus Brachiopoda based on the Guadalupin Xiala Formation in northern Tibet. Subdivision of the Xiala Formation into stratigraphical units at the Xinji section; Morphology of Lyttoniidae; Similarity of the new subfamily of Lyttoniidae Waagen to Oldhamina decipiens.