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2025-05-28T18:50:38Z

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{{Short description|Belgian geologic formation}}
{{Infobox rockunit
| name = Opglabbeek Formation
| image =
| caption =
| type =
| period = Selandian
| age = [[Paleocene|Middle to Late Paleocene]] ([[Selandian]])<br>~{{Fossil range|61.6|59.2}}
| prilithology = [[clay]], [[lignite]], [[sand]]
| otherlithology =
| namedfor = [[Opglabbeek|Opglabbeek, Belgium]]
| namedby =
| region = [[Limburg (Belgium)|Limburg]]
| country = [[Belgium]]
| coordinates = {{coord|51.08|5.73|region:BE|display=it}}
| unitof = [[Hesbaye Group]]
| subunits = Opoeteren, Eisden
| underlies = [[Heers Formation]]
| overlies = [[Houthem Formation]]
| thickness = 25-60 meters
| extent =
| area =
| map =
| map_caption =
}}

The '''Opglabbeek Formation''' is a [[formation (stratigraphy)|geologic formation]] in the [[Subsurface (geology)|subsurface]] of the eastern part of [[Limburg (Belgium)|Belgian Limburg]]. The heterogeneous formation consists of [[clay]] and [[sand]] that was deposited [[Depositional environment#Types of depositional environments|lagoonally and fluvially]] during the early [[Selandian]] (Middle [[Paleocene]], about 60 million years old). The formation is named after the town of [[Opglabbeek]] in Limburg.<ref name="laga" />

The Opglabbeek Formation is subdivided into two [[member (stratigraphy)|members]]: the Opoeteren Member (red clay with layers of [[lignite]]) and the Eisden Member (fine sand with [[cliff|crag]]s).<ref name="laga">{{cite journal |last1=Laga |first1=Pieter |last2=Louwye |first2=Stephen |last3=Geets |first3=Stéphane |title=Paleogene and Neogene lithostratigrafic units (Belgium) |journal=[[Geologica Belgica]] |date=2001 |volume=4 |pages=136, 138 |url=https://popups.uliege.be/1374-8505/index.php?id=1954 |access-date=April 28, 2022}}</ref>

The Opglabbeek Formation's thickness ranges between {{convert|25|m|ft}} and {{convert|60|m|ft}}, reaching its greatest thickness as it abuts the [[Roer]] Valley [[Graben]].<ref name="laga" /><ref name="deckers">{{cite journal |last1=Deckers |first1=Jef |last2=Matthijs |first2=Johan |title=A late Danian change in deformation style in the south-eastern part of the Campine Basin |journal=[[Geologica Belgica]] |date=January 2014 |volume=17 |issue=3–4 |page=239 |url=https://www.researchgate.net/publication/283444476 |access-date=28 April 2022}}</ref> It lies stratigraphically on top of the [[Houthem Formation]] (early Paleocene calcareous [[sandstone]]).<ref name="deckers" /> It is the lateral equivalent of the [[Hainin Formation]].<ref name="Steurbaut">{{cite journal |last1=Steurbaut |first1=E |title=High-resolution holostratigraphy of Middle Paleocene to Early Eocene strata in Belgium and adjacent areas |journal=Palaeontographica A |date=1998 |volume=247 |issue=5–6 |pages=91–156 |doi=10.1127/pala/247/1998/91 |s2cid=133583770 |url=https://limo.libis.be/primo-explore/fulldisplay?docid=LIRIAS1575545&context=L&vid=Lirias&search_scope=Lirias&tab=default_tab&lang=en_US |access-date=28 April 2022|url-access=subscription }}</ref> On top of it lies the [[Heers Formation]] (Middle Paleocene sands and [[marl]]s). The Opglabbeek Formation is part of the [[Hesbaye Group]] and can be [[correlation|correlated]] with parts of the [[Landen Formation]] of adjacent areas in the southern [[Netherlands]].<ref name="laga" />

== References ==
{{reflist}}

[[Category:Geologic formations of Belgium]]
[[Category:Paleocene Series of Europe]]
[[Category:Paleogene Belgium]]

{{Europe-geologic-formation-stub}}

Opglabbeek Formation - Revision history

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