At the same time as the Allgäu layers, the colourful Jurassic lime or Coloured sleeper limes originated. Before 190 million years the coloured Jurassic limestones were formed on the higher sill areas of the Jurassic Sea. Compared to the deeper basins, very little mud was deposited here at a depth of almost 100 metres.

Coloured Jurassic limestones are red, greenish and white limestones. The red colouring is due to the red iron oxide haematite, which is finely distributed in the rock. It can only form if there is enough time on the seabed for the iron in the mud to combine with the oxygen in the water.

Since Roman times, these beautiful, brightly coloured Jura limestones have been quarried in numerous quarries and used in many different ways as coloured marble (Lechtal Baroque, 18th century churches, castles). Polishing turns the coloured Jura limestones into beautiful decorative stones.