The Pfyn Culture is one of several archaeological cultures of the Neolithic period in Switzerland. It dates from c. 4300 BC to c. 3500 BC. Discovery The oldest traces of a settlement are about west of Pfyn in the former peat bog of Breitenloo. Located in a depression carved by a lateral moraine of the Thur glacier, it dates from the Neolithic era (4300 BC). The settlement site was discovered during peat cutting in the late 19th century but was subsequently forgotten. During the war years 1940–41, an attempt to drain the bog to increase arable production land led to its rediscovery. Drainage work on arable production was raised again. In the autumn of 1944, an area of approximately was excavated by interned Polish soldiers led by Charles Keller-Tarnuzzer. Due to the topographical conditions, and an exploratory drilling project in 2002, it appears that about 60% of the settlement area has been excavated. During the 1944 excavation, 17 different houses were found. The houses are located along a north–south main street with the gables facing the street. The buildings are almost exclusively built with two naves and have lengths of and widths from . It is striking that several houses of vastly different sizes lay side by side, suggesting perhaps larger homes with smaller farm buildings. The house floors were all built with complex support structures and overlying split boards, which were usually covered with clay. Midden heaps in the soil and partial scorch marks on the support structures suggest that at least some buildings were lifted quite high off the ground. Keller-Tarnuzzer noted that there was the close relationship of the ceramics with the Michelsberg culture of southern Germany, and believed that the Pfyn finds were a Michelsberg settlement. Around 1960, research determined that the Pfyn ceramics were represented an autonomous culture that was related to the Michelsberg culture. Since that time, the Pfyn-Breitenloo site has been regarded as the center of the Pfyn culture. Further explorations in 2002 and 2004 led to a somewhat more nuanced picture of the settlement. This enabled the site to be dated via dendrochronology. The timbers that were used were cut in 3706-3704 BC. and confirm a single development phase. Another Neolithic settlement must have existed some northwest of Breitenloo. However, the few ceramics discovered at that site are also part of the Pfyn culture. That settlement has never been systematically studied, and