Code
NUKRTW
Status
Formal (Busschers & Weerts 2003).
Lithologische beschrijving
Grey to brown fine to medium, sand, locally clayey and calcareous, and commonly firm dark grey to brown clay, silty and calcareous, clearly laminated. Local slump structures, load casts and fine-grained turbidite-like sequences.
Afzettingsmilieu
Fluvio-deltaic (Rhine filling a tongue-basin; Busschers et al. 2008).
Definitie ondergrens
Sharp contact with coarser fluvioglacial sand (Schaarsbergen Member, Drente Formation) and till (Gieten Member, Drente Formation).
Definitie bovengrens
Gradual transition into finer fluvial sand and clay (Zutphen Member, Kreftenheye Formation).
Dikte indicatie
Up to 75 m in the IJssel Valley glacial basin.
Geografische verbreiding
Near the IJssel river in the central-eastern Netherlands.
Regionale correlatie
North Sea: not present UK: not present; GER: not present; BEL: not present.
Ouderdom
late Middle Pleistocene (late Saalian) - early Late Pleistocene (early Eemian).
Hypostratotype
Well:
B33E0250 (Twello)
Depth (thickness) AH:
40.00 - 116.00 m (76 m) below land surface
Oorsprong naam
Named after the village of Twello in the central-eastern Netherlands.
Vorige benaming(en)
None.
Gereviewed door (datum)
Wim Dubelaar (2018), Sytze van Heteren (2019).
Referenties
Busschers, F.S., Weerts, H.J.T. 2003. Beschrijving lithostratigrafische eenheid. Nederlands Instituut voor Toegepaste Geowetenschappen TNO. Utrecht.
Busschers, F.S., Van Balen, R.T., Cohen, K.M., Kasse, C., Weerts, H.J.T., Wallinga, J., Bunnik, F.P.M. 2008. Response of the Rhine–Meuse fluvial system to Saalian ice‐sheet dynamics. Boreas, 37 (3), 377-398.
Cite as
TNO-GDN ([YEAR]). Twello Member. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from https://www.dinoloket.nl/en/stratigraphic-nomenclature/twello-member.