Zonderschot Member

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

Abbreviation BcZo
Parent unit Berchem Formation
Child units
Lithological description The member was formally described for the first time by De Meuter & Laga (1976) as a dark green, rather fine-grained, clayey, slightly ligniferous, very glauconitic sand, with a mode between 125 µm and 177 µm (Louwye et al., 2020; after Huyghebaert & Nolf, 1979). The micaceous sediment is very rich in homogeneously dispersed shells. The Zonderschot Member is finer grained than the other members of the Berchem Formation and has a higher clay content of approximately 12% (Huyghebaert & Nolf, 1979).
Age The planktonic foraminifers belong to the Globigerinoides trilobus trilobus/Globigerinoides altiaperturus Biozone (Blow, 1969) or the Biozone N6 or Biozone N7 (Hooyberghs, 1996), which indicates at least a Burdigalian age. The Zonderschot Member holds the benthic foraminifers of the middle Miocene Uvigerina tenuipustulata – Elphidium inflatum BFN2 Zone (De Meuter & Laga, 1976; Doppert et al., 1979; De Meuter, 1980). The calcareous nannoplankton from the Zonderschot Member indicates the presence of the NN4 Zone, and a late Burdigalian to early Langhian age is inferred (Verbeek et al., 1988). The dinoflagellate cysts indicate the presence of the early Langhian Labyrinthodinium truncatum Zone by Dybkjær & Piasecki (2010).
Thickness Huyghebaert & Nolf (1979) noted a maximum thickness of 5 m in the type section.
Area of occurrence The geographical distribution of the Zonderschot Member is not well known and is probably restricted because of the lack of outcrops and cored drillings.
Type locality The unit was described in detail in a 7 km long pipeline trench by Huyghebaert & Nolf (1979). The type locality is Zonderschot, a hamlet of Heist-op-den-Berg circa 30 km southeast of the Antwerpen. The location of the type section is given in Huyghebaert & Nolf (1979).
Alternative names
Authors Louwye, S., Adriaens, R., Deckers, J., Everaert, S., Vandenberghe, N. & Verhaegen, J.
Date 01/09/2023
Cite as Louwye, S., Adriaens, R., Deckers, J., Everaert, S., Vandenberghe, N. & Verhaegen, J., 2023. The Zonderschot Member, 01/09/2023. National Commission for Stratigraphy Belgium. http://ncs.naturalsciences.be/lithostratigraphy/Zonderschot-Member
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