yarunaganensis, Meleagrinella zadaensis) and 1 new subspecies (Parvamussium pumilum costatus) of bivalve fossils are described in Zada, Geer county, the most southwest part of Xizang.

• 文章描述了西藏最西南部札达、噶尔地区双壳类化石2新种和1新亚种,并刊出部分双壳类化石图版。