Tongeren Formation NMTF


Premise Original definition for the Netherlands by Kuyl (1975) . The Tongeren Formation is the equivalent of the classical Tongerian in Belgium of Dumont (1849). In the modern Belgian nomenclature Marechal and Laga (1988) the sediments are classified as the Sint Huibrechts-Hern Formation and the Borgloon Formation.
Derivatio nominis Named after the town of Tongeren in the province of Limburg, Belgium.
Type section Location map See figure (pdf)
  Depth NaN to NaN m
  Length NaN m along hole
  Reference A unit stratotype has not been selected as yet. The type area is located west and south of the village of Klimmen, east of Maastricht in the province of Limburg, the Netherlands. The sum total of the stratotypes of the constituent members has been taken as the stratotype of the Tongeren Formation.
Definition The lower part of the formation consists of sands. The upper part consists of clays with thin intercalations of sands and lignites.
Upper Boundary It is unconformably overlain by the Rupel Formation.
Lower Boundary The Tongeren Formation unconformably overlies the Landen Formation or older deposits.
Distribution In the Netherlands the formation is restricted to the southern part of the province of Limburg.
Age Late Priabonian and early Rupelian (NP 21 -NP 22). The foraminiferal assemblages are characteristic of the FG-Zone.
Depositional Setting The sands were deposited in an shallow-marine environment, the clays in a lagoonal to coastal-plain environment.
Sequence Stratigraphy The Tongeren Formation may represent Haq (1988) 's sequence TA 4.3 and the Lowstand part of TA 4.4 in southern Limburg.
  The formation can be subdivided into two members:
  NMTF Tongeren Formation
  NMTFG Goudsberg Member
  NMTFK Klimmen 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].