 He excavated the Rop rock shelter on the Jos Plateau in 1944, a site that contained both early stone-age implements and later artifacts, including pottery about 2000 years old.Fagg first encountered archaeological finds of what became later known as the Nok culture, after the village of Nok where the first terracotta figurines where found.He undertook a controlled evacuation of the site at Taruga, finding both terracotta figurines and iron slag with radiocarbon dates from about the fourth and third centuries BC.