| Formations, members and layers after NITG-TNO | ||
| marine | ||
| Dongen Formation DO | Asse Member DOAS | |
| Brussel Member DOBR | ||
| Ieper Member DOIE | ||
| Oosteind Member DOOO | Basal Dongen Tuffite DOOOBT | |
| Landen Formation LA | Gelinden Member LAGE | |
| Liessel Member LALI | ||
| Orp Member LAOR | ||
| Reusel Member LARE | ||
| Swalmen Member LASW | ||
The group is part of the North Sea Supergroup and consists of two marine formations of early Paleogene age, the older Landen Formation and younger Dongen Formation. It is in most places stratigraphically on top of the Late Cretaceous Chalk Group and overlain by the late Paleogene Middle North Sea Group.
The Lower North Sea Group crops out in a few spots in the south of the Netherlands but is mostly overlain by younger deposits. It can be found in the subsurface of most of the Netherlands.