Skeleton floor

A skeleton soil (abbreviation: Sk) refers to soils that consist of more than 75% components with a grain size larger than 2 mm.

Usually only the fine soil is taken into account when determining the soil type , in which the equivalent diameter of the grains is less than two millimeters. The soil skeleton (also called coarse soil) is distinguished from these types of soil ; these are all mineral or rock fragments with a diameter of over two millimeters. If the soil consists of more than 75% of such coarse grains, then one speaks of a skeleton soil. If there is less than 75% soil skeleton, its share of the total soil is only given as additional information.

A distinction is made between 2 to 63 mm between gravel and grit and from 63 to 200 mm, i.e. within the stones, between rubble and rubble, depending on whether the grains are rounded or angular.

Skeletal soils are often found in dry ( arid ) regions as well as in high mountains, since weathering takes place there mainly due to physical processes. Because of the lack of water, there is hardly any chemical weathering and soil formation is severely limited.

Skeleton soil is also a common name for the Syrosem soil type .