most tools and traces of habitation. Poulianos states that the age of the overall layer is approximately 670,000 years old, based on electron spin resonance measurements. Further excavations at Petralona revealed two human skeletons that were dated to be 800,000 years old. Today, most academics who have analyzed the Petralona remains classify the hominid as Homo erectus. However, the Archanthropus of Petralona has also been classified as a Neanderthal (Homo neanderthalensis) and as an early generic class of Homo sapiens. Some authors, on the other hand, believe that the Petralona cranium is derived from a unique class of hominids different from Homo erectus. Runnels and van Andel summarise the situation as such : "The only known hominid fossil in Greece that may be relevant is the Petralona hominid, found by chance in 1960 in a deep cavern in the Chalkidiki. Controversy surrounds the interpretation of this cranium, and it has been variously classified as Homo erectus, as a classic Neanderthal (Homo sapiens neanderthalensis), and as an early representative of Homo sapiens in a generalized sense (Day 1986: 91-95). The consensus among paleoanthropologists today is that the cranium belongs to an archaic hominid distinguished from Homo erectus, and from both the classic Neanderthals and anatomically modern humans (Day 1986: 95; Stringer, Howell, and Melenitis 1979). Whatever the final classification may be, the cranium has been provisionally dated to ca. 200-400 kyr (Day 1986: 94 Hennig et al. 1981, 1982; Wintle and Jacobs 1982), and it is thus possible that the Petralona hominid represents the lineage responsible for the Thessalian Lower Paleolithic sites." Homo erectus trilliensis In September 1995, Poulianos presented a calcified tibia found in Triglia, Chalkidiki, which he claimed belonged to a Homo erectus form he termed Homo erectus trilliensis, and which he dated to 11 million years before the present. Poulianos believes that his discovery may challenge the Out of Africa theory regarding human evolution. Published works 1960 - "The Origin of Greeks"; Ph.D Thesis at Moscow Institute of Anthropology; Reprinted in Athens in 1962, 1965, 1968, and 1988. 1961 - "Discovery of a Skull of Palaeolithic Man in Greece"; Voprossi Anthropologhii, 8:162. 1963 - "New Palaeolithic Finds of Greece"; Sov. Arheologhia, 2: 227-229. 1965 - "On the Position of the Petralona Man within Palaeoanthropi"; Sov. Ethnografia, 2: 91-99. 1967 - "The Place of the Petralonian Man among Palaeoanthropi"; Anthropos C 19, (N.S.11): 216-221. in Akten Anthropologischen Kongresses Brno.