Earlier anthropologists believed that there were "three waves" of arrival of Aboriginal and Torres Strait Islander people to Australia, the first being the "negrito" Tasmanian people, who were displaced by "Murrayans", who in turn were considered to be displaced by "Carpentarians". These theories were sometimes advocated to disprove the Aboriginal claim to being the indigenous "first peoples". The finding of a robust skeleton with surprisingly so-called "primitive" features at Kow Swamp was also advocated as proof of an earlier wave of settlers to the continent. Dating of the Kow Swamp material, however, showed that rather than being earlier, it was in fact a lot more recent than the nearby Mungo gracile skeletons that more closely resembled modern Australian Aboriginal and Torres Strait Islander people. Today it is thought that Aboriginal people throughout the continent are descendants of an original founder population, although this does not completely exclude some contribution from later arrivals.