Ville Formation NUVI

 

Premise The deposits belonging to the Ville Formation (type section in Germany; Hager (1968) Hager (1981) ) occur mainly in the Roer Valley Graben and Erft Fault block in the Lower Rhine District of Germany. Essentially the formation consists there of brown-coal seams and intercalated sand beds, part of which extend into the adjacent area of Southern and Central Limburg. These latter deposits were previously placed in the Heksenberg Formation, the status of which has been lowered to that of a member of the Ville Formation, in the present publication.
Derivatio nominis Named after the Ville upland area, west of Cologne (Germany).
Type section Location map See figure (pdf)
  Well Broeksittard 60D/1033 (pdf)
  Location N 51°00'46.3
E 05°53'35.5
  Depth 395 to 499.5 m
  Length 104.5 m along hole
  Reference This type section is only valid for the Netherlands.
Definition In the type area and the adjacent Erft Block, the formation consists of a continuous brown-coal seam, about 100 metres thick, called the Main Seam. In other areas, the formation consists of brown-coal seams alternating with predominantly medium-grained littoral sands, and continental sands and gravels. Locally, these are associated with rounded flint-gravel beds. In many places these sands are white (leaching below coal), while they have locally turned into silcretes (Nivelstein Sandstone). To the west of the area of continuous coal formation, three major coal seams, intercalated with sand, can be traced, called from bottom to top: Morken Seam, Frimmersdorf Seam and Garzweiler Seam. The major wedge-shaped sand body between the latter two seams, which increases in thickness to over 300 m in a westerly direction is called the Neurath Sand Member. It grades in westerly direction into the glauconiferous sands and silts of the Breda Formation.
Upper Boundary In the central part of the Roer Valley Graben in Germany the upper coal bed of the formation is overlain by beds of the Inden Formation, mainly clastics. In some places (e.g. open-cast mine Hambach) burrows by marine organisms in the upper coal mark a marine transgression, but marine sediments are absent. In the southeastern Netherlands, the formation is overlain by the Inden Formation, the Breda Formation or, unconformably, by younger formations.
Lower Boundary In the type area, the basal coal of the formation overlies non-marine sands of the Köln Formation. In other areas, these basal beds are laterally replaced by sands or clays and the boundary with the underlying formation is often not sharp. In the southeasternmost Netherlands the basal part of the formation consists of sand with brown-coal seamlets, overlying marine deposits of the Veldhoven Formation. Further basinward the basal part of the formation is replaced by the marine beds of the Breda Formation. Here, the Ville Formation may conformably overlie the latter formation.
Distribution The Ville Formation occurs in the Lower Rhine Embayment and its northwestern extensions (eastern Roer Valley Graben, Peel and Venlo fault blocks). Laterally, the formation interdigitates with the marine Breda Formation.
Age Early and Middle Miocene by correlation with marine beds dated directly by nannoplankton or by means of dinoflagellates as nannozone NN 3 to NN 8/9 Herngreen (1987) .
Depositional Setting The formation was formed in a coastal-lowland setting and was influenced by several marine ingressions. Exceptional is the continuous formation of brown coal in the centre of a basin-shaped area of the Lower Rhine Embayment, during a period of about 6 million years. Originally 300 m of peat was formed which as a result of compaction and coalification has been transformed to the present maximum thickness of 100 m of the Main Seam (= Hauptflöz; Zagwijn (1987) ).
Sequence Stratigraphy The formation represents the landward development of sequence TB 2.2 to TB 3.1. Possibly also TB 2.1 is represented, at least in the southeasternmost Netherlands, at the base of the formation, by transgressional beds including a bed of rolled flints overlying a stratigraphic break. The Frimmersdorf and Morken I coal seams are basinward extensions formed during the beginning of the sea-level rise following regressions of the sea at the end of sequence TB 2.3 and TB 2.2. The intercalated sands are related to a transgressional sequence. The Neurath Sand is related to the Middle Miocene transgression of the later Reinbek (Serravalian) and is correlated as to its lower part mainly with sequence TB 2.5.
Subdivision  
  In the Lower Rhine Embayment in Germany the following units have been discerned Hager (1968) Hager (1981) , from top to bottom:
  Garzweiler Coal
  Neurath Sand
  Frimmersdorf Coal
  Frimmersdorf Sand
  Morken Coal I
  In the southeastern Netherlands, the Neurath Sand, which has a coastal marine facies, is replaced by glauconiferous sands that belong to the Breda Formation i.e. the Vrijherenberg Member. There, only the lower part of the Ville Formation, underlying the Neurath Sand and its lateral equivalents, is developed. It forms the:
  NUVIH Heksenberg Member
References See References Tertiary

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