looking into the possibility of Indian groups receiving Steppe related ancestry after 1500 BC
From the Supplementary Materials for The formation of human populations in South and Central Asia by Narasimhan et al. 2019 : A claim made in The formation of human populations in South and Central Asia by Narasimhan et al. 2019 and the Steppe theorists is that the Steppe related ancestry present in the Indian people entered within 2000-1500 BC. and this is based on groups like Ksirov_H_Kushan and Steppe_LBA that have high admixture from East Asian related groups. however Genetic continuity of Indo-Iranian speakers since the Iron Age in southern Central Asia by Vignon et al. 2022 has some interesting information. from aat7487_tables1-5.xlsx of Narasimhan et al. 2019 they model Turkmenistan_IA which is dated to around 912-799 calBCE without East Asian admixture and also claim most of the East Asian admixture in the Central Steppe only arrived towards the end of the Iron Age however Steppe theorists would like to respond by saying that ...