Tielt Formation
Stratigraphic range: Ypresian
~53 Ma

PreЄ

Type| Geological formation
Unit of| Ieper Group
Sub-units| Egemkapel & Kortemark Members
Underlies| Hyon Formation
Overlies| Kortrijk Formation
Thickness| up to 25 m (82 ft)
Lithology
Primary| Sandstone
Location
Region| Hainaut, West-, East Flanders, Flemish & Walloon Brabant
Country|  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

* 1 Description
* 2 Fossil content
* 2.1 Chondrichthyes
* 2.2 Crustaceans
* 3 See also
* 4 References
* 4.1 Bibliography

## 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

Genus | Species | Location  | Stratigraphic position | Material | Notes | Images
Urobatis | U. molleni |  | Kortemark 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

Genus | Species | Location  | Stratigraphic position | Material | Notes | Images
Loerenthopluma | L. danielae | Ampe sand & clay pit near Egem.[4] | Egemkapel Clay Member.[4] | A dozen well-preserved specimens.[4] | A retroplumid crab.  |
Upogebia | U. lambrechtsi | Ampe sand & clay pit, Egem.[5] | Egemkapel Clay Member.[5] | Over 100 specimens.[5] | An upogebiid mud shrimp.  |

## See also

* List of fossiliferous stratigraphic units in Belgium
* Ypresian formations
* Fur Formation of Denmark
* London Clay Formation of England
* Silveirinha Formation of Portugal
* Wasatchian formations
* Nanjemoy Formation of the eastern United States
* Wasatch Formation of the western United States
* Itaboraian formations
* Itaboraí Formation of Brazil
* Laguna del Hunco Formation of Argentina

## References

1. ↑ 1.0 1.1 Steurbaut, 2006, p.76
2. ↑ 2.0 2.1 Tielt Formation \- National Commission on the Stratigraphy of Belgium
3. ↑ 3.0 3.1 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. https://www.researchgate.net/publication/259974829.
4. ↑ 4.0 4.1 4.2 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. https://www.researchgate.net/publication/268329999.
5. ↑ 5.0 5.1 5.2 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. https://www.researchgate.net/publication/268333982.

### Bibliography

* Steurbaut, Etienne; Marleen De Ceukelaire; Tim Lanckacker; Johan Matthijs; Peter Stassen; Hervé Van Baelen, and Noël Vandenberghe. 2017. An update of the lithostratigraphy of the Ieper Group, 1–79. National Commission for the Stratigraphy of Belgium. Accessed 2020-09-07.
* Steurbaut, Etienne. 2006. Ypresian. Geologica Belgica 9\. 73–93. Accessed 2020-09-07.
* Laga, P.; S. Louwye, and S. Geets. 2001. Paleogene and Neogene lithostratigraphic units (Belgium). Geologica Belgica 4\. 135–152. Accessed 2020-09-07.

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