Tielt Formation
| Tielt Formation | |
|---|---|
| Stratigraphic range: Ypresian ~ | |
| 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]
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 Brussels 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
- ^ a b Steurbaut, 2006, p.76
- ^ a b Tielt Formation - National Commission on the Stratigraphy of Belgium
- ^ a b 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.
- ^ a b c 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.
- ^ a b c 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
- Steurbaut, Etienne; De Ceukelaire, Marleen; Lanckacker, Tim; Matthijs, Johan; Stassen, Peter; Van Baelen, Hervé; Vandenberghe, Noël (2017), An update of the lithostratigraphy of the Ieper Group (PDF), National Commission for the Stratigraphy of Belgium, pp. 1–79, retrieved 2020-09-07
- Steurbaut, Etienne (2006), "Ypresian", Geologica Belgica, 9: 73–93, retrieved 2020-09-07
- Laga, P.; Louwye, S.; Geets, S. (2001), "Paleogene and Neogene lithostratigraphic units (Belgium)", Geologica Belgica, 4 (1–2): 135–152, doi:10.20341/gb.2014.050, retrieved 2020-09-07
Content Disclaimer
Informasi ini disarikan dari Wikipedia dan disajikan kembali untuk tujuan edukasi. Konten tersedia di bawah lisensi CC BY-SA 3.0. Kami tidak bertanggung jawab atas ketidakakuratan data yang bersumber dari kontribusi publik tersebut.
- The information displayed on this website is sourced in part or in whole from Wikipedia and has been adapted for the purpose of restating it. We strive to provide accurate and relevant information, however:
- There is no guarantee of absolute accuracy. Wikipedia is an open, collaborative project that can be edited by anyone, so information is subject to change.
- It is not intended to constitute professional advice. The content displayed is for informational and educational purposes only. For important decisions (e.g., medical, legal, or financial), please consult a professional.
- Content copyright. Wikipedia is licensed under the Creative Commons Attribution-ShareAlike License (CC BY-SA). This means that content may be reused with appropriate attribution and shared under a similar license.
- Responsible use. Any risk arising from the use of information from this website is entirely the responsibility of the user.