Code
ZEZ1
Status
Formal (NAM & RGD 1980). Amended (Van Adrichem Boogaert & Kouwe 1994).
Lithological description
Generally consists of a basal black shale, followed by carbonates - anhydrites - salts - anhydrites in the sub-basins, and carbonates - anhydrites in the main basin. Towards the fringe of the basin the unit grades progressively into a succession of carbonates - shale and/or sandstones.
Depositional setting
Marine.
Definition of lower boundary
Transgression surface overlying older units. In the basin, this corresponds to the Coppershale Member overlying the Lower or Upper Rotliegend groups.
Definition of upper boundary
Placed at the base of the Z2 Carbonate Member or the Red-brown Salt Clay Member.
Thickness indication
Up to 840 m.
Geographical distribution
Regional correlation
UK: Z1 Group; GER: Werra Folge (Z1); BEL: Z1 (Werra) Formation.
Age
Wuchiapingian.
Holostratotype
Depth (thickness) AH:
1407 - 1804 m (397 m)
Comments:
Sub-basin setting
Parastratotype
Hypostratotype
Well:
Depth (thickness) AH:
4500 - 4620 m (120 m)
Comments:
Carbonate/sandstone facies
Hypostratotype
Hypostratotype
Well:
Depth (thickness) AH:
2020 - 2069 m (49 m)
Comments:
Claystone/evaporite facies
Origin of name
Name derived from the German stratigraphic nomenclature where it is customarily applied to the oldest evaporite cycle of the Zechstein (Richter-Bernburg 1955).
Previous name(s)
None.
Reviewed by (date)
Mark Geluk (2017).
References
Geluk, M.C. 1999. Late Permian (Zechstein) rifting in the Netherlands - models and implications for petroleum geology. Petroleum Geoscience 5, 189-199.
NAM & RGD 1980. Stratigraphic nomenclature of The Netherlands. Verhandelingen van het Koninklijk Nederlands Geologisch Mijnbouwkundig Genootschap 32, 77 p.
Richter-Bernburg, G. 1955. Stratigraphische Gliederung des deutschen Zechsteins - Z. Dt. Geol. Ges., 105, 593-645.
Van Adrichem Boogaert, H.A. & Kouwe, W.F.P. 1994. Stratigraphic nomenclature of The Netherlands; revision and update by RGD and NOGEPA, Section D, Permian. Mededelingen Rijks Geologische Dienst, 50, 1-42.
Cite as
TNO-GDN ([YEAR]). Z1 (Werra) Formation. In: Stratigraphic Nomenclature of the Netherlands, TNO – Geological Survey of the Netherlands. Accessed on [DATE] from http://acc.dinoloket.nl/en/stratigraphic-nomenclature/z1-werra-formation.