Kruisschans Member

The information on this page is a summary description.
The full formal description is available here: Kruisschans Member

Abbreviation LiKr
Parent unit Lillo Formation
Child units
Lithological description The Kruisschans Member was formally redefined by De Meuter and Laga (1976) as a grey-green, fine-grained to medium fine-grained, locally coarse-grained, glauconiferous quartz sand with shell debris and abundant small shells. Many clay lenses and clay layers occur. The thickness of the clay layers varies between 1 to 1.5 cm but can sometimes reach 10 cm to 20 cm. The sediment can be strongly bioturbated. A gravel layer was described at the base of the Kruisschans Member in the America Dock (de Heinzelin, 1955 after Vincent, 1889 and Delheid, 1895) and the Boudewijn Sluice (de Heinzelin, 1952) temporary outcrops in the Port of Antwerp.
Age Early late Pliocene. See Louwye et al. (2020) and references therein.
Thickness The thickness of this member seems rather uniform around 3 m (Deckers et al., 2019).
Area of occurrence From the Port of Antwerp area in het west up to the western Campine area in the east. It presumably covers the western Campine area up to roughly the SW-NE line between Beerse and Weelde in the east. Here, the transition towards the time-equivalent Poederlee Member can be assumed (Louwye et al., 2020).
Type locality De Meuter & Laga (1976) named Kruisschans, a former village to the north of the city of Antwerp as type locality. These authors also selected the temporary outcrop of the Boudewijnsluis (DOV kb7d15w-B282) described by de Heinzelin de Braucourt (1955) and where the member occurs between -5.5 and -7.5 m depth TAW. In the Tunnel Kanaaldok section of Laga (1972) (now named Tijsmanstunnel) (GSB 015W0304; DOV BGD015W0304), which is the stratotype-section of the Lillo Formation, the member outcropped between 15 and 21 m depth, translating to -10.5 and -13.5 m TAW (Figure 59 1). On the nearby CPT (DOV GEO-20/034-S5), the Kruisschans Member is characterised by relatively high friction ratios (between 2 and 3%) and low cone resistance values of around 10 MPa. In the Verrebroekdok section of Goolaerts (2000) (DOV TO-19990901), the member outcropped between and -2.2 and -5.8 m TAW (fide Deckers et al., 2020; Figure 59 2). Type geophysical borehole log is borehole Stabroek (GSB: 015W0216; DOV kb7d15w-B296) with the Merksem Member from 21 to 26 m depth (modified after Laga, 1979; Figure 59 3).
Alternative names The Kruisschans Member as defined here includes the America Dock gravel (de Heinzelin, 1955 after Vincent, 1889 and Delheid, 1895) and the Grobbendonk clay (Vandenberghe et al., 2000). Former names: “Sables à Laevicardium parkinsoni” (see De Meuter & Laga (1976) and Louwye et al. (2020) for overview and references).
Authors Deckers, J., Louwye, S. & Goolaerts, S.
Date 01/09/2023
Cite as Deckers, J., Louwye, S. & Goolaerts, S., 2023. The Kruisschans Member, 01/09/2023. National Commission for Stratigraphy Belgium.
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