Tubbergen Formation

Code
DCDT
Status
Formal (NAM & RGD 1980). Amended (Van Adrichem Boogaert & Kouwe 1995).
Lithological description

Succession of grey to white or pink to red sandstone beds of variable thicknesses, alternating with mudstones and rare coal seams.
Sands are fine- to very coarse-grained, occasionally grading up to pebble size, moderately-sorted and subangular. Sandstones occur in channel fills of 5 to 20 m thick, yielding blocky log patterns, can occur stacked into massive intervals of up to 100 m thick. Intercalated mudstone sections predominantly light-grey or greenish grey.
Coal seams: associated with the grey mudstone intercalations of 5 to 50 m thick. Purple or red-brown intervals become dominant in the youngest parts.

Depositional setting

The massive, thick sandstone intervals: amalgamated braided fluvial channel fills.
Thinner sand-/siltstone beds and fines: overbank deposits, grey colours in the fines and the associated coal seams indicate predominant poorly-drained overbank soil conditions. The upward shift to variegated and red colours reflects an increase in aridity and improving soil drainage.

Definition of lower boundary

Marked by the first appearance of thick-bedded sandstones. This is generally accompanied by a marked decrease in the frequency of coal seams, compared with the underlying Maurits Formation.

Definition of upper boundary

Placed at the top of a major sandstone bed, which is overlain by an interval of at least 40 m thick which consists predominantly of mudstones. The Tubbergen Formation grades into the Hellevoetsluis Formation in the province of Utrecht.

Thickness indication
Up to 495 m in TUB-08.
Geographical distribution
Regional correlation
UK: ?; GER: ?; BEL: ?.
Age
Moscovian.
Holostratotype
Depth (thickness) AH:
2434 - 2930 m (496 m)
Hypostratotype
Depth (thickness) AH:
3507 - 3868 m (361 m)
Hypostratotype
Depth (thickness) AH:
3456 - 3678 m (222 m)
Origin of name
Named after the Dutch village Tubbergen.
Previous name(s)
None.
Reviewed by (date)
Tom van Hoof (2017).
References
NAM & RGD 1980. Stratigraphic nomenclature of The Netherlands. Verhandelingen van het Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap 32, 77 p.
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1995. Stratigraphic nomenclature of The Netherlands, revision and update by RGD and NOGEPA, Section C, Silesian. Mededelingen Rijks Geologische Dienst, 50, 1-40.
Cite as
TNO-GDN ([YEAR]). Tubbergen Formation. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://www.dinoloket.nl/en/stratigraphic-nomenclature/tubbergen-formation.