Associated evidence, such as stone tools, artifacts and settlement localities, is more numerous than fossilised remains of the hominin occupants themselves. The simplest pebble tools with a few flakes struck off to create an edge were found in Dmanisi, Georgia, and in Spain at sites in the Guadix-Baza basin and near Atapuerca. The Oldowan tool discoveries, called "Mode 1-type assemblages" are gradually replaced by a more complex tradition that included a range of hand axes and flake tools, the Acheulean, "Mode 2-type assemblages". Both types of tool sets are attributed to "Homo erectus", the earliest and for a very long time the only human in Europe and more likely to be found in the southern part of the continent. However, the Acheulean fossil record also links to the emergence of "Homo heidelbergensis", particularly its specific lithic tools and handaxes. The presence of "Homo heidelbergensis" is documented since 600,000 BC in numerous sites in Germany, Great Britain and northern France.