A kind of dwelling built by people of the Upper Palaeolithic in central and eastern Europe between c 25,000-12,000 bp, especially in areas where wood was scarce. The remains of such a structure would typically have a circular or oval arrangement of woolly mammoth bones and tusks, with a central hearth and occupation debris. The bones and tusks were the structure's support. External to the structure may be hearths, pits, and debris. Examples are found in Poland and the former Soviet Union. Mammoth bones were used to build the winter structures for some of these peoples and the mammoth fat used to keep the fires burning.