The first known human settlements in what is now Catalonia were at the beginning of the Middle Palaeolithic. The oldest known trace of human occupation is a mandible found in Banyoles, described by some sources as pre-Neanderthal some 200,000 years old; other sources suggest it to be only about one third that old.[1] Some of the most important prehistoric remains were found in the caves of Mollet (Serinyà, Pla de l'Estany), the Cau del Duc in the Montgrí mountain ("cau" meaning "cave" or "lair"), the remains at Forn d'en Sugranyes (Reus) and the shelters Romaní and Agut (Capellades), while those of the Upper Paleolithic are found at Reclau Viver, the cave of Arbreda and la Bora Gran d'en Carreres, in Serinyà, or the Cau de les Goges, in Sant Julià de Ramis. From the next prehistoric era, the Epipaleolithic or Mesolithic, important remains survive, the greater part dated between 8000 BC and 5000 BC, such as those of Sant Gregori (Falset) and el Filador (Margalef de Montsant).