Bernissart Calcirudites Formation

The information on this page is a summary description.
The full formal description is available here: Bernissart Calcirudites Formation

Abbreviation BRN
Parent unit Haine Green Sandstone Group
Child unit
Lithological description Granular to gravelly, organo-detritic, grey to yellow at outcrop, only slightly glauconitic limestones, with flints and a chalcedony cement, with sandy and glauconitic marl beds. Towards the base the limestones are coarse, conglomeratic, glauconitic and ferruginous: this is the Hautrage Conglomerate Bed (Robaszynski, 1975c) or “Tourtia”, as seen in local names such as “Tourtia de Tournai”, “Tourtia de Montignies-sur-Roc”; “Tourtia du Pas-de-Calais” in northern France, “Tourtia” or “Sarrazin de Bellignies”.
Age Early and Middle Cenomanian age on the basis of the ammonites Mantelliceras mantelli (Early Cenomanian), Acanthoceras rhotomagense (Middle Cenomanian) and Schloenbachia varians and the oyster Amphidonte obliquatum.
Thickness 2 to 30 m and sometimes more in the most subsided parts of the basin.
Area of occurrence From the western part of the Mons Basin to the north of France.
Type locality
Alternative names
Authors Robaszynski, F., Dhondt, A.V. & Jagt, J.W.M.
Date 01/01/2001
Cite as Robaszynski, F., Dhondt, A.V. & Jagt, J.W.M., 2001. The Bernissart Calcirudites Formation, 01/01/2001. National Commission for Stratigraphy Belgium.

Lithostratigraphic units

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