Clay houses together with log, half-timbered and stone houses constitute basic forms of traditional dwellings in Europe. Clay is used as supplementary material in many areas, but it became dominant primarily in central and lower Danube regions (including the Morava and Tisa river basins) and the Black Sea areas of Moldova and Ukraine. Extensive loess deposits are characteristic for these lowlands. All types of clay constructions and also timber-frame construction filled with different materials such as wattle, reed and daub can be found in the area. the timber-frame construction has been known since prehistoric times, but scholars disagree about the age of the clay building technologies (rammed, cob and adobe constructions). Some relation may be sought for in the antique building tradition; however, clay building spread only in the 18th and 19th centuries.