Breda Formation NUBA

 

Premise Original definition by Doppert et al (1975) , amended by NAM and RGD (1980) .
Derivatio nominis Named after the town of Breda in the province of Noord-Brabant.
Type section Location map See figure (pdf)
  Well Rijsbergen 50A/154 (pdf)
  Location N 51°30'50.5
E 04°39'15.4
  Depth 174 to 234 m
  Length 60 m along hole
  Reference Doppert et al (1975)
Additional section Location map See figure (pdf)
  Well Wouw 49E/65
  Location N 51°28'53.7
E 04°20'36.5
  Depth 96 to 189 m
  Length 93 m along hole
  Reference Doppert et al (1975)
  Well Klundert 43H/63 (pdf)
  Location N 51°39'17.3
E 04°33'07.1
  Depth 281 to 318 m
  Length 37 m along hole
  Reference NAM and RGD (1980) .
Definition Sequence of marine, glauconitic sands, sandy clays and clays. In many places a glauconite-rich layer occurs at the base.
Upper Boundary The upper boundary has been placed at the transition to the less glauconiferous sands and clays of the Oosterhout Formation, which are often rich in shells. In the southeastern Netherlands the formation interdigitates with the mainly continental deposits of the Ville, Inden and Kieseloölite Formations. In the northeastern part of the country the upper part of the Breda Formation is in lateral contact with the near-shore to continental beds of the Scheemda Formation. In cases where it is difficult to distinguish the boundaries of the formations purely on lithological criteria, biostratigraphic information may prove helpful.
Lower Boundary An unconformity is usually present at the base of the Breda Formation. The formation rests on the Veldhoven Formation in places where there is only a small or limited hiatus in the succession, i.e. in the central and southeastern Netherlands. Elsewhere, the formation rests with a clear break on the Rupel Formation (mainly Boom Clay Member) or, locally, on older deposits. Where the basal part of the Breda Formation is a clay, the lower boundary is in many places marked by a bed with high gamma-ray radiation, probably as a result of glauconite enrichment.In the southeastern Peel region and part of the Roer Valley Graben the lower boundary of the formation is difficult to establish, because the transition from the slightly glauconitic beds of the Veldhoven Formation into the greensands of the Breda Formation is gradual.
Distribution The formation is present in most of the Netherlands subsurface. Is it missing in small areas in the extreme east, southeast and southwest of the country, and on the Kijkduin High and a northwestern extension into the offshore area.
Age Miocene, locally also earliest Pliocene.
Depositional Setting The Breda Formation was deposited in a shallow-marine environment. The formation largely consists of fore-set and bottom-set beds deposited in a delta-front setting.
Subdivision  
  Up to now, some subdivisions have only been proposed in a local context. However, the Breda Formation merits further study to unravel its delta-front architecture, which could lead to a regional subdivision into members that have a genetic significance.
  Local subdivisions are distinguished for:
  the eastern Netherlands (Achterhoek and Twente, see Figure I.1 (see pdf) ) by van den Bosch (1975) as follows:
  NUBA Breda Formation
  NUBAD Delden Member
  NUBAZ Zenderen Member
  NUBAE Eibergen Member
  NUBAA Aalten Member
  The subdivision is based primarily on variations in clay and sand content, and is supported by faunal differences. All deposits are more or less rich in glauconite. The Delden Member is rich in goethite and contains phosphorite concretions. For details the reader is referred to van den Bosch (1975) .
  the northeastern Netherlands (eastern parts of the provinces of Groningen and Drenthe) by Doppert et al (1975) . The topmost beds of the Breda Formation have been described as the:
  NUBAN Nieuweschans Member
   
  It consists of mainly of greenish and liver-coloured, clayey sands, rich in hornblende, which is characteristic for this member in this area. Marine shell remains are absent in these deposits, but palynological data point to a marine origin.
  southern Limburg by Kuyl (1975) . Near-shore marine and continental deposits of the Heksenberg Member of the Ville Formation intertongue with the Breda Formation, dividing it into two local members from top to bottom:
  NUBAV Vrijherenberg Member
  NUBAK Kakert Member
  These members consist of loamy, glauconitic sands, and are restricted to southern Limburg. Where the Kakert Member overlies the Rupel Clay Member unconformably, often e layer of rolled chert pebbles, shark teeth and phosphate nodules occurs. This unit is known as the Elslo Bed (Laag van Elslo; Kuyl (1975) , op. cit.).
  Outside southern Limburg, where a tongue of the Ville Formation can be distinguished in the Breda Formation (e.g. Heksenberg Member in well Asten-1, Annex I-1) this succession can be divided informally into:
  NUBAU upper Breda member
  NUVIH Heksenberg Member
  NUBAL lower Breda member
References See References Tertiary

Van Adrichem Boogaert, H.A. & Kouwe, W.F.P., 1993-1997. [Stratigraphic unit]. In: Stratigraphic Nomenclature of the Netherlands.
Retrieved [Datum] from [url].