Bertraimont Formation

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

Abbreviation Be
Parent unit
Child units
Lithological description This marine unit contains, from base to top, three units:
– a grey, sandy, smectite clay, poorly calcareous and glauconiferous, with some peb-bles;
– green, very glauconitic, clayey sands, with some marl layers; disseminated pebbles are present. Polymorphina are frequent, few lamellibranchs and gasteropods occur;
– marls, lithified calcareous marls, grey or yellowish, glauconiferous limestone, with detritic quartz grains and pebbles. Foraminifera, gasteropods and lamellibranchs occur frequently, sometimes abundantly.
Age Thanetian.
Thickness Probably not more than 40 m.
Area of occurrence Deepest parts of the Mons Basin, only known from boreholes.
Type locality For the first time described as the “Heersien” in the “Brasserie Paternostre” borehole at Mons (Delvaux, 1877). Sheet 45/7-8 (Mons – Givry). Co-ordinates: x = 120.32, y = 126.44, z = +31 m. The formation is most complete in borehole no. 7 of the “Charbonnage du Hainaut” (1918) between 65.5 m and 97 m depth (incomplete core recovery) (Saint-Ghislain 138, in Marlière, 1969). Sheet 45/5-6 (Quièvrain – Saint-Ghislain). Co-ordinates: x = 108.90, y = 128.15, z = +24 m.
Alternative names
Authors Laga, P., Louwye S. & Geets, S.
Date 01/01/2001
Cite as Laga, P., Louwye S. & Geets, S., 2001. The Bertraimont Formation, 01/01/2001. National Commission for Stratigraphy Belgium.


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