 A number of texts previously believed to be of native Tangut origin turned out to be translations of Khitan source texts.The degree of Tibetan impact on the formation of Tangut Buddhism still remains unexplored, especially in the light of new discoveries showing that Tangut Buddhism owed more to the local culture in North China than to pure Tibetan or Chinese influences.Texts belonging to the Tibetan Mahamudra tradition demonstrate that Tangut Buddhism initially evolved along the Karma Kagyu rather than Sakya lines of Buddhist transmission.