from excavations from the 1950s onwards at West Stow in the United Kingdom are 3.7m-4.44m long x 2.72m-3.5m wide x 0.58m-0.97m deep. Within this pit were placed two (but sometimes 0, 4, or 6) substantial wooden posts in postholes at either end of the long axis. Some archaeologists have suggested that a suspended wooden floor lay over the pit and that the cavity beneath was used for storage or to control dampness, although others have disputed this, suggesting that grubenhäuser did not have suspended floors at all. A gabled roof supported by the timber posts covered the hut, which likely had no windows and had a single entrance at one end. Excavations at West Stow (UK) in the 1970s found preserved evidence of charred planks, suggestive of suspended floors. Hearths were also found, which sat partially over the edge of the sunken pits and appeared to have collapsed downwards when the structure supporting their overhanging sections (possibly a suspended floor) was removed. Grubenhäuser are often understood to have been domestic dwellings. However, their use may have varied, especially on a regional basis. In Western Europe their small size and the fact that they can be found near other buildings and associated finds of loom weights has led to theories that they had a specialised purpose such as for weaving sheds. In the Slavonic regions of Eastern Europe, Grubenhäuser are larger and often have a fireplace. In most settlements there have been no features of buildings at ground level. There are reconstructions of pit-houses in several open-air museums, e.g. in the Hitzacker Archaeological Centre, the Kalkriese Museum and Park, the Oerlinghausen Archaeological Open Air Museum, and the Hochdorf Chieftain's Grave. In North America Throughout the inland Pacific Northwest, indigenous people were nomadic during the summer and gathered resources at different spots according to the season and tradition, but overwintered in permanent semi-subterranean pit houses at lower elevations. The winter was often the only time families saw others—even if they were from the same village and tribe—and congregated in any numbers before the arrival of trading posts. Often these houses were located along major rivers and tributaries like the Columbia and Fraser; were typically round and fairly small, and were covered in layers of tule mats to keep out the weather and keep in the heat. There was a smoke hole in the center, and the interior, though warm in winter, was