The Lower North Sea Group (abbreviation: NL) is a group of geologic formations in the

subsurface In geology, bedrock is solid rock that lies under loose material (regolith) within the crust of Earth or another terrestrial planet. Definition Bedrock is the solid rock that underlies looser surface material. An exposed portion of bedro ...

of the Netherlands and adjacent parts of the North Sea. The group is part of the North Sea Supergroup and consists of two marine formations of early

Paleogene The Paleogene ( ; British English, also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period, geologic period and system that spans 43 million years from the end of the Cretaceous Period million yea ...

age, the older

Landen Formation The Landen Formation (abbreviation: LA) is a lithostratigraphic unit (a set of rock strata) in the subsurface of the Netherlands. This formation shares its name with the Belgian Landen Group, but the Belgian unit is thinner and has different defin ...

and younger

Dongen Formation The Dongen Formation ( nl, Formatie van Dongen; abbreviation: DO) is a geologic formation in the subsurface of the Netherlands. The formation consists of early Eocene marine clay and sand. It is named after the town of Dongen in North Brabant ...

. It is in most places stratigraphically on top of the Late Cretaceous

Chalk Group The Chalk Group (often just called the Chalk) is the lithostratigraphic unit (a certain number of rock strata) which contains the Upper Cretaceous limestone succession in southern and eastern England. The same or similar rock sequences occur acr ...

and overlain by the late Paleogene

Middle North Sea Group The Middle North Sea Group (abbreviation: NM) is a group of geologic formations in the Dutch subsurface, part of the North Sea Supergroup. The three formations of this group form a thick sequence of sediments in the Dutch subsurface, they crop ...

. 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.

References

Geologic groups of Europe Lithostratigraphy of the Netherlands Geology of the North Sea Paleogene Europe {{Europe-geologic-formation-stub