definition of loam types
Loam is a type of soil, consisting of sand, silt, and clay. It occurs in various compositions under the upper humus layer in all parts of the world. Depending on their grain size and their formation, there exist different types of loam: alluvial loam, boulder loam, loess loam, and mountain loam.
Boulder loam is glacial, fine-grained, non-layered sediment, which is partly interspersed with large rocks, so-called boulders. It was formed when moraines (of ice-age glaciers) were deposited. Depending on the degree of weathering and lime content, its color varies from grey to yellow-brown. Characteristic for this type of loam are the polished, round boulders, that are, fragments of magmatic or metamorphic rock of the Scandinavian mountains.
This whole process did not happen overnight. Loam is the result of thousands of years of development.