Name for a reddish coloured rock, which was formed during the geological period Rotliegend. The conspicuous red colouring is caused by finely distributed hematite scales (red iron stone). Rotliegendes is an old miner's term and refers to the red rocks that are stored under the usable copper slate. It was therefore originally called "red dead lying". The soil was formed from calcareous clay, silt and sandstones. It has only a limited water storage capacity, but is well aerated. Rooting of the deeper rock is difficult. The term is particularly common in the German growing regions of Pfalz and Rheinhessen and also Nahe for the vineyard soils found there. These occur in the form of red slate, especially in the "Red Slope" within the area known as the Rhine Front. Another type of soil containing iron is called Terra Rossa.