jernlag
Jernlag is a term used in geology and soil science to describe a distinct layer or stratum within the soil profile that is rich in iron. This iron enrichment is typically a result of various pedogenic processes, meaning the processes of soil formation. The iron can be present in different forms, including iron oxides, iron hydroxides, and sometimes iron carbonates, depending on the soil's redox conditions (the balance between oxidation and reduction).
The presence of a jernlag can indicate specific environmental conditions that have prevailed over time. For