6. ORGANO-CHEMICAL UNITS (author: Gullentops)

Description: Organo-chemical processes are responsible for a great variety of deposits and soils. These are extremely sensitive to climatic conditions and so of utmost importance for stratigraphical deductions. It follows that their presence must be documented with great care. When assimilation to a well described unit is possible, the normal rules are applied. All the units are treated as of Bed rank and abbreviated to a capital letter. They are subsidiary to a Member or Formation of the marine, fluvial, eolian or mass realm. When assimilation to a described unit is not yet possible it is recorded by its lithology abbreviated to a minuscule letter.