| Chalk Group |
Houthem Formation |
Ho |
| Haine Group |
Ciply Formation |
Ci |
| |
Mons Formation |
Mo |
| |
Hainin Formation |
Ha |
| Opglabbeek Formation |
|
Op |
| Bertaimont Formation |
|
Be |
| Heers Formation |
|
Hs |
| Landen Group |
Hannut Formation |
Hn |
| |
Tienen Formation |
Ti |
| Ieper Group |
Kortrijk Formation |
Ko |
| |
Tielt Formation |
Tt |
| |
Gentbrugge Formation |
Ge |
| Zenne Group |
Aalter Formation |
Aa |
| |
Brussel Formation |
Br |
| |
Lede Formation |
Ld |
| Maldegem Formation |
|
Ma |
| Tongeren Group |
Zelzate Formation |
Zz |
| |
Sint Huibrechts Hern Formation |
Sh |
| |
Borgloon Formation |
Bo |
| Rupel Group |
Bilzen Formation |
Bi |
| |
Boom Formation |
Bm |
| |
Eigenbilzen Formation |
Eg |
| |
Voort Formation |
Vo |