The information on this page is a summary description.
The full formal description is available here: Egem Member
| Abbreviation | HyEg |
| Parent unit | Hyon Formation |
| Child units | |
| Lithological description | The sediment is a finely laminated, well sorted, mica and glauconite containing and generally fossiliferous fine sand. Lamination is mainly horizontal with in addition cross lamination, hummocky stratification and infilling of broad shallow gullies. Heavy clay layers occur of cm and dm scale often cut by erosive sand?filled channels. The base of the Egem Member is a strongly erosive level with active channelling above the Egemkapel Member. A marked paleoseismite horizon occurs in the middle of the Egem Member exposed in the Ampe/Egem pit (Crepin et al. ,2004). Towards the top, the sediment becomes coarser and more homogeneous with numerous nummulites. A detailed section of the Egem Member in the Ampe/Egem quarry and corresponding grain?size data (Geets, 1991) in the Tielt borehole 068E0169, are shown in Steurbaut (1998, p 117). Subdivisions of the Egem Member can be regionally followed in CPT logs and borehole descriptions (Jacobs et al., 1996a, b). On geophysical logs the base of the Egem Member can generally be recognised by a sharp increase in resistivity as it generally overlies the clay?rich Egemkapel Member. |
| Age | |
| Thickness | |
| Area of occurrence | The Egem Member occurs over most of the provinces of West and East Flanders (Steurbaut & Nolf, 1986; King, 1991 p370) and its extension northeastwards into the Antwerp province has been interpreted in many publications although an identification as Hyon Formation is probably more prudent. On regional profiles the base of the Egem Member is clearly erosive into underlying units (Vandenberghe et al., 1998; King, 1991). The Ledeberg sand and Evergem sand are synonymous for the Egem Member (Geets et al., 2000). In the legend of the 1:40 000 maps the Egem Member is representing the Yd and the P1b units and in the stratigraphic register (1929, 1932) the Y1b division (Geets et al., 2000). |
| Type locality | The Ampe/Egem extraction pit ? 053W0060 in Egem (Pittem) (mapsheet 21/1 Wingene x= 70.150, y= 190.150, z= +44m) between +39.5 m to +19 m T.A.W, between the Egemkapel Member below and the X?sandstone (in this review named the Hooglede Bed) bed underlying the Pittem Member above (Geets et al., 2000). A detailed description of the Ampe/Egem extraction pit anno 1994?1995, comprising the Egemkapel, Egem and Pittem Members can be found in Willems (1995) and Steurbaut (2015). |
| Alternative names | |
| Authors | Steurbaut, E., De Ceukelaire, M., Lanckacker, T., Matthijs, J., Stassen, P., Van Baelen, H. & Vandenberghe, N. |
| Date | 09/01/2017 |
| Cite as | Steurbaut, E., De Ceukelaire, M., Lanckacker, T., Matthijs, J., Stassen, P., Van Baelen, H. & Vandenberghe, N., 2017. The Egem Member, 09/01/2017. National Commission for Stratigraphy Belgium. http://ncs.naturalsciences.be/lithostratigraphy/Egem-Member |
