Kortrijk Clay
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The Kortrijk Formation (; ; abbreviation: Ko; named after the
West Flemish West Flemish (''West-Vlams'' or ''West-Vloams'' or ''Vlaemsch'' (in French Flanders), , ) is a collection of Low Franconian varieties spoken in western Belgium and the neighbouring areas of France and the Netherlands. West Flemish is spoken by ...
city of
Kortrijk Kortrijk ( , ; or ''Kortrik''; ), sometimes known in English as Courtrai or Courtray ( ), is a Belgian City status in Belgium, city and Municipalities in Belgium, municipality in the Flemish Region, Flemish Provinces of Belgium, province of We ...
) is a
geologic formation A geological formation, or simply formation, is a body of rock having a consistent set of physical characteristics ( lithology) that distinguishes it from adjacent bodies of rock, and which occupies a particular position in the layers of rock exp ...
in the Belgian
subsurface In geology, bedrock is solid rock that lies under loose material (regolith) within the crust of Earth or another terrestrial planet. Definition Bedrock is the solid rock that underlies looser surface material. An exposed portion of bedro ...
. This formation crops out in northern Hainaut, southern West and
East Flanders East Flanders ( ; ; ; ) is a Provinces of Belgium, province of Belgium. It borders (clockwise from the North) the Netherlands, Dutch province of Zeeland and the Belgian provinces of Antwerp (province), Antwerp, Flemish Brabant, Hainaut (provinc ...
and in
Walloon Brabant Walloon Brabant ( ; ; ) is a province located in Belgium's French-speaking region of Wallonia. It borders on (clockwise from the North) the province of Flemish Brabant (Flemish Region) and the provinces of Liège, Namur and Hainaut. Walloon Br ...
. The formation consists of marine
clay Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolinite, ). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impuriti ...
from the
Ypresian In the geologic timescale the Ypresian is the oldest age (geology), age or lowest stage (stratigraphy), stratigraphic stage of the Eocene. It spans the time between , is preceded by the Thanetian Age (part of the Paleocene) and is followed by th ...
age Age or AGE may refer to: Time and its effects * Age, the amount of time someone has been alive or something has existed ** East Asian age reckoning, an Asian system of marking age starting at 1 * Ageing or aging, the process of becoming older ...
(early
Eocene The Eocene ( ) is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (Ma). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene'' comes ...
, about 54 million years old).Steurbaut, 2006, p.76Kortrijk Formation
- National Commission on the Stratigraphy of Belgium


Description

The Kortrijk Formation consists predominantly of clay, sometimes
sand Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is usually defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural ...
y or
silt Silt is granular material of a size between sand and clay and composed mostly of broken grains of quartz. Silt may occur as a soil (often mixed with sand or clay) or as sediment mixed in suspension (chemistry), suspension with water. Silt usually ...
y. The formation generally becomes sandier to the east, in Brabant and the
Campine The Campine () or Kempen () is a natural region situated chiefly in north-eastern Belgium and parts of the south-eastern Netherlands which once consisted mainly of extensive moors, tracts of sandy heath, and wetlands. It encompasses a large n ...
area. In some places
fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserve ...
s or
bioturbation Bioturbation is defined as the reworking of soils and sediments by animals or plants. It includes burrowing, ingestion, and defecation of sediment grains. Bioturbating activities have a profound effect on the environment and are thought to be a ...
occur. In the westernmost part of Belgium it can be thick, but it gradually wedges out to the east.


Subdivision

The Kortrijk Formation is subdivided into at least four
members Member may refer to: * Military jury, referred to as "Members" in military jargon * Element (mathematics), an object that belongs to a mathematical set * In object-oriented programming, a member of a class ** Field (computer science), entries in ...
: the Mont Héribou, Orchies or Saint-Maur, Moen or Roubaix and the Aalbeke Member. The Kortrijk Formation forms the lowest part of the
Ieper Group The Ieper Group (; ) is a group (stratigraphy), group of stratum, rock strata in the Subsurface (geology), subsurface of northwest Belgium. The group is subdivided into three marine (ocean), marine formation (stratigraphy), formations, all formed ...
and is stratigraphically overlain by the younger Tielt Formation (late Ypresian marine sand), part of the same group. The Kortrijk Formation lies on top of late
Paleocene The Paleocene ( ), or Palaeocene, is a geological epoch (geology), epoch that lasted from about 66 to 56 mya (unit), million years ago (mya). It is the first epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), ...
formations like the
Tienen Formation The Tienen Formation (; ; abbreviation: Ti) 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) t ...
or Hannut Formation, both part of the Landen Group.


See also

*
List of fossiliferous stratigraphic units in Belgium See also * Lists of fossiliferous stratigraphic units in Europe ** List of fossiliferous stratigraphic units in France ** List of fossiliferous stratigraphic units in Germany ** List of fossiliferous stratigraphic units in Luxembourg ** List o ...
* Ypresian formations **
Fur Formation The Fur Formation is a marine geological formation of Ypresian ( Lower Eocene Epoch, c. 56.0-54.5 Ma) age which crops out in the Limfjord region of northern Denmark from Silstrup via Mors and Fur to Ertebølle, and can be seen in many cliffs and ...
of Denmark **
London Clay Formation The London Clay Formation is a marine geological formation of Ypresian (early Eocene Epoch, c. 54-50 million years ago) age which crops out in the southeast of England. The London Clay is well known for its fossil content. The fossils from the ...
of England ** Silveirinha Formation of Portugal * Wasatchian formations **
Nanjemoy Formation The Nanjemoy Formation is a Formation (geology), geologic formation pertaining to both the Wilcox Group and the Pamunkey Group of the eastern United States, stretching across the states of Virginia, Maryland, and the District of Columbia. The f ...
of the eastern United States **
Wasatch Formation The Wasatch Formation (Tw)Shroba & Scott, 2001, p.3 is an extensive highly fossiliferous Formation (geology), geologic formation stretching across several basins in Idaho, Montana, Wyoming, Utah and western Colorado.Itaboraian formations **
Itaboraí Formation The Itaboraí Formation () is a highly list of fossiliferous stratigraphic units in Brazil, fossiliferous geologic Formation (geology), formation and LagerstätteKellner & Campos, 1999, p.399 of the Itaboraí Basin in Rio de Janeiro (state), Rio d ...
of Brazil **
Laguna del Hunco Formation The Laguna del Hunco Formation or Laguna del Hunco Tuff () is a localized Early Eocene (Itaboraian in the SALMA classification) fossiliferous geological formation of the Cañadón Asfalto Basin in central Patagonia, Argentina. The thick formati ...
of Argentina


References


Bibliography

* * * {{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 Geologic formations of Belgium Eocene Series of Europe Paleogene Belgium Ypresian Stage Shale formations Shallow marine deposits Formations Formations Formations Formations