A pit-dwelling had a dug-out floor space about 50 centimeters below ground level,either circular with a diameter of about 5 meters, or square with rounded corners. Four to six wooden pillars were set into holesin the floor,connected at the top with beams. The beams supported roof rafters.

Many remains of pit-dwellings have been discovered,but the vast manority preserve only the hollowed-out pit and pillar holes,with virtually no trace of the wooden structure above. It is difficult to get a picture of pit-dwelling structuers from Jomon-period materials alone.

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