Changes

The defining characteristic of these hominids placing them in the genus Homo is their ability to make tools. Initially, they made stone tools, typically of flint and quartzite, shaped and sharpened on only one surface (using stone tool technology). And later, tools were made by shaping both sides of the stone, forming bifacial preforms typical of Acheulean technology. The early tools, which were bulky and heavy and made in situ, were abandoned as soon as hunted animals were cut and skinned, whereas bifacial tools were typically kept for future use, as they were more versatile and difficult to produce.

The Middle Paleolithic, which began approximately 130,000 years BC, coincided with the widespread presence of Homo neanderthalensis.

In the majority of settlements, where human remains have been observed, lithic remnants have also been uncovered; however, the reverse case is not necessarily true. For example, the multiple artefacts discovered at Atapuerca can be only attributed to the Neanderthals; however, actual (skeletal) fossil remains of this hominid group have not been found at this site. Such findings hinder the study of evolutionary changes.

The Upper Paleolithic, which coincided with the end of the Upper Pleistocene, saw the evolutionary rise of a new species called Homo sapiens starting in approximately 40,000 BC. The end of the Upper Pleistocene on the Iberian Peninsula took place around 12,000 to 10,000 BC, which was followed by a new epoch called the Neolithic, also known as the Holocene on the geological time scale.