When the sea level rose as the results of the melting ice north of Europe and the American continent, many island emerged, including Indonesian archipelgo. Java was one of the earliest places where human beings lived. In 1891, Eugene Dubois found the fossils, Homo Erectus who live during the Pleitocene period, on the island of Java. Negritos, a pygmy people who began to radiate through the islands about 30 000 years ago, were some of the first known fully human migrants into Indonesia. There are still genetic traces of these short, woolly-haired, round-headed people eastern Sumatra, the Lesser Sundas, and the deep interior of Irian Jaya.