The tools that were found within the Java sites are quite different from the Acheulean type that are found in Africa and Europe in which this type of stone tools implicates the H. erectus or Homo ergaster culture. Thus, the tools that are found in Java might suggest a different set of the culture of H. erectus between African and Asian regions. Swisher et al. (1994) also suggest that these tools developed separately from the Acheulean types and might indicate that H. erectus might migrate out of Africa even before the Acheulean type of tools were developed. However, the stone tools found in the Java region are difficult for establishing the age that can link to the H. erectus fossils. The research and analyses (tools, deposits, and faunal analyses) above thus suggests that the Javanese fossils are to be placed in the Middle Pleistocene or approximately 1.66 – 0.7 Ma.
