Tielt Formation

{{Infobox rockunit

| name = Tielt Formation

| period = Ypresian

| age = Ypresian
~{{fossil range|53}}

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| type = Geological formation

| prilithology = Sandstone

| otherlithology =

| unitof = Ieper Group

| subunits = Egemkapel & Kortemark Members

| underlies = Hyon Formation

| overlies = Kortrijk Formation

| thickness = up to {{Convert|25|m|ft|abbr=on}}

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| region = Hainaut, West-, East Flanders, Flemish & Walloon Brabant

| country = Belgium

| extent = Campine Basin

| namedfor = Tielt

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| region_ts = West Flanders

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}}

The Tielt Formation ({{langx|nl|Formatie van Tielt}}; {{langx|fr|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).Steurbaut, 2006, p.76[https://ncs.naturalsciences.be/paleogene-neogene/273-tielt-formation-012017 Tielt Formation] - National Commission on the Stratigraphy of Belgium

Description

The Tielt Formation is {{convert|25|m|ft|abbr=on}} 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.

Fossil content

=Chondrichthyes=

class="wikitable" align="center"
colspan="7" align="center" \| Chondrichthyes reported from the Tielt Formation
Genus	Species	Location !Stratigraphic position !Material	Notes	Images
Urobatis \|U. molleni \| \|Kortemark Silt & Egem members.{{Cite journal \|last1=Hovestadt \|first1=Dirk \|last2=Hovestadt-Euler \|first2=M. \|date=January 2010 \|title=Urobatis molleni nov.sp. (Chondrichthyes, Myliobatiformes, Urolophidae) in the Eocene of Belgium. \|url=https://www.researchgate.net/publication/259974829 \|journal=Geominpal Belgica \|volume=1 \|issue=3 \|pages=66–69}} \|Numerous teeth. \| A round ray also known from the Aalter & Brussels Sand formations. \|

class="wikitable" align="center"

colspan="7" align="center" | Chondrichthyes reported from the Tielt Formation

Genus

Species

Location

!Stratigraphic position

!Material

Notes

Images

Urobatis

|U. molleni

|

|Kortemark Silt & Egem members.{{Cite journal |last1=Hovestadt |first1=Dirk |last2=Hovestadt-Euler |first2=M. |date=January 2010 |title=Urobatis molleni nov.sp. (Chondrichthyes, Myliobatiformes, Urolophidae) in the Eocene of Belgium. |url=https://www.researchgate.net/publication/259974829 |journal=Geominpal Belgica |volume=1 |issue=3 |pages=66–69}}

|Numerous teeth.

| A round ray also known from the Aalter & Brussels Sand formations.

|

=Crustaceans=

colspan="7" align="center" \| Crustaceans reported from the Tielt Formation
class="wikitable" align="center"
Genus	Species	Location !Stratigraphic position !Material	Notes	Images
Loerenthopluma \|L. danielae \| Ampe sand & clay pit near Egem.{{Cite journal \|last1=Van Bakel \|first1=Barry \|last2=Artal \|first2=Pedro \|last3=Fraaije \|first3=R. \|last4=Jagt \|first4=John W. M. \|date=January 2010 \|title=Loerenthopluma Danielae, a new crab (Decapoda, Brachyura, Retroplumidae) from the lower Eocene of Northwest Belgium \|url=https://www.researchgate.net/publication/268329999 \|journal=Brachyura: A Homage to Danièle Guinot \|pages=41–49}} \|Egemkapel Clay Member. \|A dozen well-preserved specimens. \| A retroplumid crab. \|
Upogebia \|U. lambrechtsi \|Ampe sand & clay pit, Egem.{{Cite journal \|last=Fraaije \|first=R. \|date=January 2006 \|title=Two new Paleogene species of mud shrimp (Crustacea, Decapoda, Upogebiidae) from Europe and North America \|url=https://www.researchgate.net/publication/268333982 \|journal=Bulletin of the Mizunami Fossil Museum \|issue=33 \|pages=81–89}} \|Egemkapel Clay Member. \|Over 100 specimens. \|An upogebiid mud shrimp. \|

References

= Bibliography =

{{citation |last1=Steurbaut |first1=Etienne |first2=Marleen |last2=De Ceukelaire |first3=Tim |last3=Lanckacker |first4=Johan |last4=Matthijs |first5=Peter |last5=Stassen |first6=Hervé |last6=Van Baelen |first7=Noël |last7=Vandenberghe |year=2017 |title=An update of the lithostratigraphy of the Ieper Group |url=https://ncs.naturalsciences.be/sites/default/files/Litho%20Ieper%20Group%20201702.pdf |publisher=National Commission for the Stratigraphy of Belgium |pages=1–79 |accessdate=2020-09-07}}
{{citation |last=Steurbaut |first=Etienne |year=2006 |title=Ypresian |url=https://popups.uliege.be/1374-8505/index.php?id=1101 |journal=Geologica Belgica |volume=9 |pages=73–93 |accessdate=2020-09-07}}
{{citation |last1=Laga |first1=P. |last2=Louwye |first2=S. |last3=Geets |first3=S. |year=2001 |title=Paleogene and Neogene lithostratigraphic units (Belgium) |url=https://popups.uliege.be/1374-8505/index.php?id=1954 |journal=Geologica Belgica |volume=4 |issue=1–2 |pages=135–152 |doi=10.20341/gb.2014.050 |accessdate=2020-09-07|doi-access=free }}

Category:Geologic formations of Belgium

Category:Eocene Series of Europe

Category:Paleogene Belgium

Category:Ypresian Stage

Category:Sandstone formations

Category:Shallow marine deposits

Formations