This paper presents the corpus of prehistoric rotary querns stored in the Museum of Archaeology of Stavanger, the largest collection of this type of mill in Norway. Most are linked to excavations carried out of early longhouses by Jan Petersen in the early half of the 20th century. The study focuses in part on the question of the introduction of the rotary movement of mills in Norway and quern production based on surface materials predating the direct extractive process identified at the medieval quarry district of Hyllestad.