Tielt Formation

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Tielt Formation
Stratigraphic range: Ypresian
~53  Ma
O
S
D
C
P
T
J
K
Pg
N
Type Geological formation
Unit of Ieper Group
Sub-unitsEgemkapel & Kortemark Members
Underlies Hyon Formation
Overlies Kortrijk Formation
Thicknessup to 25 m (82 ft)
Lithology
Primary Sandstone
Location
Region Hainaut, West-, East Flanders, Flemish & Walloon Brabant
CountryFlag of Belgium (civil).svg  Belgium
Extent Campine Basin
Type section
Named for Tielt
Region West Flanders

The Tielt Formation (Dutch : Formatie van Tielt; French : Formation de Tielt; abbreviation: Tt; named after the town of Tielt in West Flanders) is a geologic formation in the subsurface of Belgium. The formation crops out in the north of Hainaut, in the southern and central parts of West- and East Flanders and in Walloon and Flemish Brabant. It consists of marine very fine sand and silt, deposited in the shallow sea that covered Belgium during the middle and late Ypresian age (early Eocene, about 53 million years ago). [1] [2]

Contents

Description

The Tielt Formation is 25 m (82 ft) thick at most. It is subdivided into two members: the Kortemark and Egemkapel Members. The formation lies stratigraphically on top of the Kortrijk Formation (early Ypresian sandy clay and silt). In the northwestern part of Belgium, the Gentbrugge Formation (late Ypresian marine clay and silt) covers the Tielt Formation. If the Gentbrugge Formation is absent, the younger Brussel Formation (Lutetian calcareous sand) is directly found on top of the Tielt Formation. [1] [2]

Fossil content

Chondrichthyes

Chondrichthyes reported from the Tielt Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Urobatis U. molleniKortemark Silt & Egem members. [3] Numerous teeth. [3] A round ray also known from the Aalter & Brussels Sand formations.

Crustaceans

Crustaceans reported from the Tielt Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Loerenthopluma L. danielaeAmpe sand & clay pit near Egem. [4] Egemkapel Clay Member. [4] A dozen well-preserved specimens. [4] A retroplumid crab.
Upogebia U. lambrechtsiAmpe sand & clay pit, Egem. [5] Egemkapel Clay Member. [5] Over 100 specimens. [5] An upogebiid mud shrimp.

See also

Related Research Articles

The Danian is the oldest age or lowest stage of the Paleocene Epoch or Series, of the Paleogene Period or System, and of the Cenozoic Era or Erathem. The beginning of the Danian is at the Cretaceous–Paleogene extinction event 66 Ma. The age ended 61.6 Ma, being followed by the Selandian.

The Thanetian is, in the ICS Geologic timescale, the latest age or uppermost stratigraphic stage of the Paleocene Epoch or Series. It spans the time between 59.2 and56 Ma. The Thanetian is preceded by the Selandian Age and followed by the Ypresian Age. The Thanetian is sometimes referred to as the Late Paleocene.

<span class="mw-page-title-main">Ypresian</span> First age of the Eocene Epoch

In the geologic timescale the Ypresian is the oldest age or lowest stratigraphic stage of the Eocene. It spans the time between 56 and47.8 Ma, is preceded by the Thanetian Age and is followed by the Eocene Lutetian Age. The Ypresian is consistent with the Lower Eocene.

The Hesbaye Group is a stratigraphic group in the subsurface of northeastern Belgium. This group was deposited during the early Paleocene epoch and is subdivided into two formations: the Houthem Formation (lower) and the Opglabbeek Formation (upper). The group is named after the region of Hesbaye in the south of Limburg.

The Opglabbeek Formation is a geologic formation in the subsurface of the eastern part of Belgian Limburg. The heterogeneous formation consists of clay and sand that was deposited lagoonally and fluvially during the early Selandian. The formation is named after the town of Opglabbeek in Limburg.

The Hannut Formation is a geologic formation in the subsurface of northern Belgium. The formation consists of marine clay and silt, alternating with more sandy layers. On top of this the lithology changes to limestone, siltstone and sandstone and the top of the formation is formed by a layer of glauconite bearing sand. The Hannut Formation was formed during the early to middle Thanetian age.

The Heers Formation is a geologic formation in the subsurface of Belgium. The formation consists of sand and marl and was deposited in the shallow sea that covered Belgium during the middle to late Selandian age of the Paleocene epoch.

The Landen Group is a lithostratigraphic unit in the Belgian subsurface. The group consists of two formations of Thanetian to Ypresian age. The Landen Group is named after the town of Landen in Flemish Brabant.

The Tienen Formation is a geologic formation in the subsurface of northern Belgium. The formation crops out in the province of Hainaut and the Hesbaye region in the province of Limburg. It has a late Thanetian (Paleocene) to early Ypresian (Eocene) age.

The Ieper Group is a group of rock strata in the subsurface of northwest Belgium. The group is subdivided into three marine formations, all formed during the Ypresian, a single age of the geologic timescale. Both age and group are named after the West Flemish town of Ypres, for which the Dutch name is "Ieper".

The Rupel Group is a stratigraphic group of rock strata in the subsurface of Belgium. It is subdivided into three formations that are all marine deposits of Oligocene age.

The Zenne Group is a group of rock strata in the subsurface of central and northwest Belgium. The group consists of three formations, all from the Ypresian and Lutetian ages. These formation have their shallow marine facies in common.

The Aalter Formation is a geologic formation in the subsurface of northwest Belgium. The formation consists of marine clay and sand, deposited in the shallow sea that covered northern and central Belgium in the Eocene epoch.

The Gentbrugge Formation is a geologic formation in the west of Belgium. The formation crops out in East Flanders and West Flanders and also occurs in the subsurface of the Province of Antwerp. It consists of marine clay, silt and sand, deposited in the shallow sea that covered northern Belgium during the Ypresian age.

The Kortrijk Formation is a geologic formation in the Belgian subsurface. This formation crops out in northern Hainaut, southern West and East Flanders and in Walloon Brabant. The formation consists of marine clay from the Ypresian age.

The Voort Formation or Voort Member is a stratigraphic unit in the subsurface of north Belgium and the south of the Netherlands. The unit has the status of a formation in Belgium but is seen as a member of the Veldhoven Formation in the Netherlands. The Voort Formation consists of shallow marine sands with a late Oligocene age.

The Maldegem Formation is a geologic formation in the Belgian subsurface. The formation consists of alternating marine clay and sand strata, deposited during the late Eocene.

The Brussel Formation is a geologic formation in the subsurface of central Belgium. The formation is named after the Belgian capital, Brussels. It consists of shallow marine sandstone and calcareous sands, deposited in the sea that covered Belgium 45 million years ago, in the Eocene.

The Lede Formation is a geologic formation in the subsurface of Belgium. The formation is named after the town of Lede in East Flanders. It consists of shallow-marine limestone and sandstone, deposited in the former sea that covered Belgium during the Eocene.

The Tongeren Group is a lithostratigraphic unit in the subsurface of Belgium. It consists of shallow marine, epicontinental and/or continental clays and sands from the late Eocene to early Oligocene epochs.

References

  1. 1 2 Steurbaut, 2006, p.76
  2. 1 2 Tielt Formation - National Commission on the Stratigraphy of Belgium
  3. 1 2 Hovestadt, Dirk; Hovestadt-Euler, M. (January 2010). "Urobatis molleni nov.sp. (Chondrichthyes, Myliobatiformes, Urolophidae) in the Eocene of Belgium". Geominpal Belgica. 1 (3): 66–69.
  4. 1 2 3 Van Bakel, Barry; Artal, Pedro; Fraaije, R.; Jagt, John W. M. (January 2010). "Loerenthopluma Danielae, a new crab (Decapoda, Brachyura, Retroplumidae) from the lower Eocene of Northwest Belgium". Brachyura: A Homage to Danièle Guinot: 41–49.
  5. 1 2 3 Fraaije, R. (January 2006). "Two new Paleogene species of mud shrimp (Crustacea, Decapoda, Upogebiidae) from Europe and North America". Bulletin of the Mizunami Fossil Museum (33): 81–89.

Bibliography