The information on this page is a summary description. The full formal description is available here: Obourg Chalk Formation Abbreviation OBG Parent unit Chalk group Child units Lithological description A fine-grained white chalk, slightly greyer than the overlying Nouvelles Formation. In the northern part of the basin it contains a few dark black flints (used...
The information on this page is a summary description. The full formal description is available here: Nouvelles Chalk Formation Abbreviation NOU Parent unit Chalk group Child units Lithological description A pure, massive, soft, very fine-grained white chalk, without flints, except for two to three bands of small flint nodules at the top. There is a...
The information on this page is a summary description. The full formal description is available here: Spiennes Chalk Formation Abbreviation SPI Parent unit Chalk group Child units Lithological description A white to whitish-grey, rather coarse-grained chalk, which becomes calcarenitic towards the top. It contains many large black to grey-brown cherts and some black chert bands,...
The information on this page is a summary description. The full formal description is available here: Ciply-Malogne Phosphatic Chalk Formation Abbreviation CIP Parent unit Chalk group Child units Lithological description Cohesive or crumbly calcarenite, invariably intensely bioturbated, consisting of phosphate granules within a chalky matrix. The granules are brown at the surface, but grey in...
The information on this page is a summary description. The full formal description is available here: Harchies Formation Abbreviation HAR Parent unit Haine Green Sandstone Group Child units Lithological description Alternation of “spongolites”, phosphatic conglomerates and glauconitic sands. Marine fauna is very poorly preserved. Age In the basal part of the Formation, Actinoceramus concentricus and...
The information on this page is a summary description. The full formal description is available here: Catillon Formation Abbreviation CAT Parent unit Haine Green Sandstone Group Child units Lithological description Glauconitic sands, more or less siliceousglauconites, marls with siliceous and phosphatic nodules, with numerous sponges. This formation is clearly less coarse-grained than the underlying Harchies...
The information on this page is a summary description. The full formal description is available here: Braquegnies Formation Abbreviation BRA Parent unit Haine Green Sandstone Group Child units Lithological description Levels with sandy glauconitic marls, conglomerates, sandstones and sands, occasionally common sponge remains. Ammonite and bivalve faunas are rich and diverse at certain levels. Age...
The information on this page is a summary description. The full formal description is available here: Chalk group Abbreviation Parent unit Child units Thivencelles Marls Formation, Thulin Marls Formation, Ville-Pommeroeul Chert Formation, Hautrage Flints Formation, Strépy Formation, Sint-Denis Silicite Formation, Maisières Chalk Formation, Nevele Formation, Saint-Vaast Chalk Formation, Trivières Chalk Formation, Obourg Chalk Formation, Nouvelles...
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 units 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...
The information on this page is a summary description. The full formal description is available here: Thivencelles Marls Formation Abbreviation THV Parent unit Chalk group Child units Lithological description Clayey, soft, “plastic” when wet, swelling when exposed, generally green when fresh, but yellow after alteration at outcrop: these are the “Dièves moyennes” of J. Cornet...
