The information on this page is a summary description.
The full formal description is available here: Gemelingen Member
| Abbreviation | |
| Parent unit | Arenberg Formation |
| Child units | |
| Lithological description | Green, blue to grey clayey to silty deposits. Organic or peaty horizons are often present, especially in the lower parts. The unit contains vivianite and calcium carbonates. The clay deposits are generally homogeneous and massively bedded. Occasionally they contain sandy and/or silty intercalations with a limited vertical and horizontal distribution. These intercalations are more widespread in the upstream part. The sediments of this member often are soft and less consolidated than those of the overlying St. Paulus Member. Horizons with a crumbly structure are observed in the upper part. The stratification of the silty deposits is massive or varies from diffuse horizontal lamination to small scale ripple bedding. The following major facies types are observed: Irregular composite sets of clayey and sandy laminae Lenticular sandy intercalations often with vegetation remains, wood fragments and/or freshwater molluscs. The Gemelingen Member usually overlies the Rotselaar Member and is nearly always covered by the St. Paulus Member. The transition to both members may be gradual. Where the Rotselaar Member is not present, the Gemelingen Member can overlie any older fluvial unit. In some parts of the Schelde basin, mostly in the downstream reaches, this member is absent or poorly developed and can be hard to differentiate from the St. Paulus Member (Fig. 1). |
| Age | Holocene. |
| Thickness | 10 cm to several meters. |
| Area of occurrence | Schelde basin. |
| Type locality | Alluvial plain of the Mark river, Gemelingen (Galmaarden), Lambert coordinates: x=120 758; y=160 234 (Huybrechts, 1985). |
| Alternative names | |
| Authors | Bogemans, F., Kiden, P., Huybrechts, W., Notebaert, B., Beerten, K., Lanckacker, T., Rixhon, G. & Heyvaert, V. |
| Date | 01/01/2017 |
| Cite as | Bogemans, F., Kiden, P., Huybrechts, W., Notebaert, B., Beerten, K., Lanckacker, T., Rixhon, G. & Heyvaert, V., 2017. The Gemelingen Member, 01/01/2017. National Commission for Stratigraphy Belgium. http://ncs.naturalsciences.be/lithostratigraphy/Gemelingen-Member |
