Zur Genese der Böden aus Hochflutlehm auf der Niederterrasse im Räume Bonn-Köln-Krefeld

Abstract. Closer investigations of soil profiles developed out of high flood loams of the Lower Terrace revealed that their classification as „Parabraunerde" (grey-brown podsolic soils) is not correct. It was found that they consist of layered sediments, and having been exposed to strong hydromorphic influences they show an alteration to terrestrial soils. For that great soil group the name "Altvega" is proposed. Synsedimentary clay depositions and structure formations in those soils reduce the indicative value of the clay migration.