Marine deposit, consisting of a succession of sharp based clays, gradually coarsening upwards into sands. The formation starts with grey, glauconiferous, fine sand, growing more clayey at the top and covered by a strongly glauconiferous clay, with locally coarse glauconitic sand at the base. A homogeneous, less glauconiferous, grey blue, heavy clay is followed by a dark grey, silty fine sand, glauconiferous and micaceous. This sand is covered by a grey blue, heavy clay, which passes into a dark grey, silty fine sand. The formation ends by a grey blue, heavy clay, with perforations at the top, filled by humic, grey, fine sand and a lot of organic material, indicating a soil development or a gap in the sedimentation.
Age
Late Lutetian and Bartonian.
Thickness
50 m in the northeast, but only a few meters in the southern outliers.
Area of occurrence
The formation outcrops in a part of the north of West- and East-Flanders and in the region between the Dender and Zenne rivers. It occurs in the subsoil in the whole northern part of West- and East-Flanders and disappears to the east in the Antwerpse Kempen; it forms outliers in the Brabant and South Flanders hillrows.
Type locality
Alternative names
Authors
Laga, P., Louwye S. & Geets, S.
Date
01/01/2001
Cite as
Laga, P., Louwye S. & Geets, S., 2001. The Maldegem Formation, 01/01/2001. National Commission for Stratigraphy Belgium. http://ncs.naturalsciences.be/lithostratigraphy/Maldegem-Formation
