This revolving millstone was found during excavation work for a private house in St. Ulrich and dates back to the early Iron Age. This type of millstone follows on from the earlier hopper and lever type and therefore has the same function as the typical Mediterranean millstone. However, it has side grooves for inserting wooden levers, which made turning the stones a lot easier.

This typical Mediterranean millstone made from local porphyry dates back to pre-Roman times and was found in various pieces at Col de Flam. Small quantities of grain (barley, oats) were shaken through the hole and milled when coming into contact with a flat, fixed lower stone. The upper stone was turned with a wooden handle, while the lower stone has not been preserved.

These two grindstones made of volcanic stone from Col de Flam excavation site were used for milling grain. Grindstones were pushed back and forth across a fixed grinding stone. This spherical grindstone exploded after being heated to a high temperature. This is a sign that a large blaze took place in the house that it was kept in.