Code
NUBXBS
Status
Formal (Schokker et al. 2005; Schokker et al. 2007).
Lithological description
Stiff brownish grey to brownish green loam, sandy, with intercalated light brown very fine to medium sand, silty, non-calcareous, rooted. Local peat layers.
Depositional setting
Fluvial floodplain (Meuse), aeolian and small-scale fluvial.
Definition of lower boundary
Usually a sharp contact with underlying fine to moderately coarse-grained sand of the Boxtel Formation.
Definition of upper boundary
Usually, sharp contact with fine to medium sand of the Boxtel Formation (undifferentiated) or with coarser fluvial and fluvioglacial deposits (e.g. Koewacht Formation, Kreftenheye Formation, Sterksel Formation, Waalre Formation and Drente Formation).
Thickness indication
Generally 4-6 m, up to 10 m.
Geographical distribution
Northern part of the Roer Valley Graben in the southeastern Netherlands.
Regional correlation
North Sea: not present; UK: not present; GER: ?; BEL: ?
Age
Presumably late Middle Pleistocene (Saalian) or older.
Holostratotype
Well:
B51B0301 (Best-Ekkerswijer)
Depth (thickness) AH:
22.01 - 28.05 m (6.04 m) below land surface
Comments:
Schokker et al. (2007).
Origin of name
Named after the village of Best, in the southern Netherlands.
Previous name(s)
None.
Reviewed by (date)
Wim Dubelaar (2018), Sytze van Heteren (2019).
References
Schokker, J, De Lang, F.D., Weerts, H.J.T., Den Otter, C., Passchier, S. 2005. Beschrijving lithostratigrafische eenheid. Nederlands Instituut voor Toegepaste Geowetenschappen TNO. Utrecht.
Schokker, J., Weerts, H.J.T., Westerhoff, W.E., Berendsen, H.J.A., Den Otter, C. 2007. Introduction of the Boxtel Formation and implications for the Quaternary lithostratigraphy of the Netherlands. Netherlands Journal of Geosciences / Geologie en Mijnbouw, 86, 197-210.
Cite as
TNO-GDN ([YEAR]). Best Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://acc.dinoloket.nl/en/stratigraphic-nomenclature/best-member.