Paul Thomas presents evidence that Indian Tantric Śaivism exerted a direct influence on Tibetan Dzogchen in the 11th and 12th centuries. As Paul Thomas argues in his recent PhD dissertation, it is probable that Indian Tantric Śaivism exerted a direct influence upon Tibetan rDzogs chen in the eleventh and twelfth centuries. In this talk he discusses two related elements of this crossover: peculiar tripartite lineage schemes, and revelation and transmission in particular cremation ground settings.