| Group or Formation |
Period |
Notes |
| A' Formation | Devonian | |
| Aachenian Formation | Cretaceous | |
| Aalter Formation | Paleogene | |
| Acoz Formation | Devonian | |
| Aisemont Formation | Devonian | |
| Alvana limeshales Formation | Devonian | |
| Anhee Formation | Carboniferous | |
| Ass. de Frasnes Formation | Devonian | |
| Assise de Winenne Formation | Devonian | |
| Barvaux Formation | Devonian | |
| Berada Formation | Neogene | |
| Berchem Formation | Neogene | |
| Bernissart Calcirudites Formation | Cretaceous | |
| Bois d'Ausse Sandstone Formation | Devonian | |
| Bois de Bordeaux Formation | Devonian | |
| BoisFormation | Devonian | |
| Boom Formation | Paleogene | |
| Borgloon Formation | Paleogene | |
| Brussel Formation | Paleogene | |
| Brussels Formation | Paleogene | |
| Brussles Formation | Paleogene | |
| Bruxelles Formation | Paleogene | |
| Bruxellian Formation | Paleogene | |
| Burnotien Formation | Devonian | |
| Calcaire de Eisden Formation | Paleogene | |
| Calcaire de Lives Formation | Carboniferous | |
| Calcaire de Maredsous Formation | Carboniferous | |
| Calcaire de Mons Formation | Paleogene | |
| Calcaire de Premier Formation | Carboniferous | |
| Calcaire de Seilles Formation | Carboniferous | |
| Carboniferous Limestone Formation | Carboniferous | |
| Carboniferous limestone Formation | Carboniferous | |
| Chemung Formation | Devonian | |
| Ciply Phosphatic Chalk Formation | Cretaceous | |
| CiplyFormation | Cretaceous | |
| Claminforge Formation | Devonian | |
| Clays of Ypres Formation | Paleogene | |
| Craie d'Obourg Formation | Cretaceous | |
| Craie de Ciply Formation | Cretaceous | |
| Craie de Maisieres Formation | Cretaceous | |
| Craie de Nouvelles Formation | Cretaceous | |
| Craie de Spiennes Formation | Cretaceous | |
| Craie de Triviéres Formation | Cretaceous | |
| Diest Formation | Neogene | |
| Dieves et Fortes Toises Formation | Cretaceous | |
| Edegem Sands Formation | Neogene | |
| Evieux Formation | Devonian | |
| Famenne Formation | Devonian | |
| Famenne Group/"Senzeille" Formation | Devonian | |
| Flénu Formation | Carboniferous | |
| Franc Waret Formation | Devonian | |
| Frasnian F2i Formation | Devonian | |
| Frasnian moyen Formation | Devonian | |
| Fromelennes Formation | Devonian | |
| Givetian 1b facies Formation | Devonian | |
| Glauconie de Lonzée Formation | Cretaceous | |
| Grands Breux Formation | Devonian | |
| Gres (et schists) de Wepion Formation | Devonian | |
| Gres d'Acoz Formation | Devonian | |
| Gres de Acoz Formation | Devonian | |
| Gres de Mortinsart Formation | Triassic | |
| Gres de Wepion Formation | Devonian | |
| Gres de Wiheries Formation | Devonian | |
| Gres du Bois d'Ausse Formation | Devonian | |
| Grès d'Orval Formation | Jurassic | |
| Gréseux de Florenville Formation | Jurassic | |
| Gulpen Formation | Cretaceous | |
| Hainin Formation | Paleogene | |
| Hannut Formation | Paleogene | |
| Hanonet Formation | Devonian | |
| Heers Formation | Paleogene | |
| Hodimont Formation | Devonian | |
| Houthem Formation | Paleogene | |
| Jemelle Formation | Devonian | |
| Kallo Sands Formation | Neogene | |
| Kasterlee Formation | Neogene | |
| Kattendijk Formation | Neogene | |
| Kattendijk, Lillo Formation | Neogene | |
| Kortijk Clay Formation | Paleogene | |
| Lambermont Formation | Devonian | |
| Landen Formation | Paleogene | |
| Le Roux Formation | Devonian | |
| Lede Formation | Paleogene | |
| Leroux Formation | Devonian | |
| Les Valisettes Formation | Devonian | |
| Lillo Formation | Neogene | |
| Lives Formation | Carboniferous | |
| Lustin Formation | Devonian | |
| Maastricht Formation | Cretaceous | |
| Marbre Noir Formation | Carboniferous | |
| Marne de Strassen Formation | Jurassic | |
| Marne de Warcq Formation | Jurassic | |
| Marne Grise Formation | Cretaceous | |
| Marnes de Jamoigne Formation | Jurassic | |
| Meerssen Chalk Formation | Cretaceous | |
| Merksem Formation | Belgium | |
| Messancy Formation | Jurassic | |
| Middle Frasnian, F2i Formation | Devonian | |
| Moulin Lienaux Formation | Devonian | |
| Moulin Liénaux Formation | Devonian | |
| Neerrepen Sands Formation | Paleogene | |
| Neuville Formation | Devonian | |
| Nouvelles Chalk Formation | Cretaceous | |
| Nèvremont Formation | Devonian | |
| Névremont Formation | Devonian | |
| Obourg Chalk Formation | Cretaceous | |
| Pepinster Formation | Devonian | |
| Poudingue de Ciply Formation | Paleogene | |
| Presles Formation | Devonian | |
| Rivière Formation | Devonian | |
| Rouillon Formation | Devonian | |
| Sables a'Anvers Formation | Neogene | |
| Sables d'Anvers Formation | Neogene | |
| Sables de MonsFormation | Paleogene | |
| Sables de Mortinsart Formation | Triassic | |
| SaintFormation | Cretaceous | |
| SouverainFormation | Devonian | |
| SouverainFormation | Devonian | |
| Spiennes Chalk Formation | Cretaceous | |
| St. Symphorien Gravel Formation | Cretaceous | |
| Tielrode Formation | Neogene | |
| Tienen Formation | Paleogene | |
| Tongeren Group/Borgloon Formation | Paleogene | |
| Tournai Formation | Carboniferous | |
| Trivieres Chalk Formation | Cretaceous | |
| Trois Formation | Devonian | |
| Trois Fontaines Formation | Devonian | |
| Tufeau de Ciply Formation | Paleogene | |
| Tuffeau de St Symphorien Formation | Cretaceous | |
| Vaals Formation | Cretaceous | |
| Waulsort Fazies Formation | Carboniferous | |
| Wealden Group/Baudour Clays Formation | Cretaceous | |
| Wealden Group/SainteFormation | Cretaceous | |
| Wemmel Formation | Paleogene | |
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