Lachalandage

Lachalandage is a term used to describe a specific type of soil horizon found in certain geological formations. It refers to a layer of soil characterized by the presence of rounded or oval-shaped concretions, often composed of calcium carbonate, iron oxides, or manganese oxides. These concretions can vary significantly in size, from small pebbles to larger masses several centimeters in diameter.

The formation of lachalandage is typically associated with periods of fluctuating water tables and alternating oxidation and reduction processes within the soil. These conditions can lead to the precipitation and accumulation of mineral compounds around a nucleus, gradually forming the characteristic concretions. The distribution and composition of lachalandage can provide valuable insights into the paleoclimate and hydrogeological history of a region.

This soil horizon is often found in arid and semi-arid environments, where evaporation rates are high, concentrating dissolved minerals. It can also occur in areas with poor drainage or where groundwater has been stagnant for extended periods. The presence of lachalandage can influence soil properties such as drainage, aeration, and nutrient availability, potentially impacting vegetation growth and agricultural suitability. Geologists and soil scientists study lachalandage to understand soil development processes and reconstruct past environmental conditions.