The information on this page is a summary description.
The full formal description is available here: Opgrimbie Member
| Abbreviation | |
| Parent unit | Gent Formation |
| Child units | |
| Lithological description | The Opgrimbie Member consists of homogeneous sand and silty sand. The colour is pure and bright white, to grey, yellow and brown, and is dependent on local hydro- and/or pedological processes. Massive stratification is dominant, horizontal or oblique stratification may be present. Frost cracks, frost wedges and deformation structures can be present in the sediments, as well as thin (usually one pebble-thick) gravel horizons. Intercalated soil horizons, organic-rich layers, clay-enriched lamellae are frequently observed; the intercalated soils can be weak, well-developed or degraded, and their appearance depends on the parent material in which they developed. A cultural layer is common at the top. The Opgrimbie Member covers the Tisselt Member (if present). In sequences, it can usually be distinguished from the overlying Achterbos Member (if present), essentially on account of colour and/or an intercalated organic-rich (soil) horizon or cultural layer. |
| Age | Late Weichselian (MIS2) and, occasionally, Holocene (MIS1) (see e.g. Bogemans and Vandenberghe, 2011; Derese et al. 2009; 2010a; 2010b; 2012; Vandenberghe et al., 2009). |
| Thickness | Up to several metres |
| Area of occurrence | Coversand and transitional area in Flanders. |
| Type locality | Opgrimbie: N50°5713 E5°3852 |
| Alternative names | |
| Authors | Beerten, K., Bogemans, F., Heyvaert, V., Vandenberghe, D. & Van Nieuland, J. |
| Date | 15/01/2016 |
| Cite as | Beerten, K., Bogemans, F., Heyvaert, V., Vandenberghe, D. & Van Nieuland, J., 2016. The Opgrimbie Member, 15/01/2016. National Commission for Stratigraphy Belgium. http://ncs.naturalsciences.be/lithostratigraphy/Opgrimbie-Member |
