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NPD has compiled a set of charts of the names of lithostratigraphic formations on the Norwegian Continental shelf. Three charts have been prepared, one for each of the main regions of the continental shelf: the Norwegian North Sea, the Norwegian Sea and the Norwegian Barents Sea. NPD requests industry and others to refer to these names in their reports to the NPD.
The three NPD charts present the lithostratigraphic units within the framework of the nomenclature of the International Chronostratigraphic
Chart of the International Commission on Stratigraphy (ICS), which may be downloaded in both English and Norwegian official versions from the ICS website.
English and Norwegian versions may also be found on the website of the NPD:
Sources and references to the names of lithostratigraphic formations used in the NPD 2014 lithostratigraphic charts
The 2014 NPD charts are based on the formal official lithostratigraphic nomenclature approved by the Norwegian Committee on Stratigraphy and published in the references below. These names appear in the charts in black letters.
In addition to the formal names referred to above, there are several supplementary names for lithostratigraphic units that have been proposed and published through time as need has arisen. The NPD recognizes the need for many of these names and have made a selection of such names to be used on a provisional basis as informal names. These names are included in the 2014 NPD charts in blue letters. These informal names are adopted from the publications below. Some of these publications also suggest minor adjustments of some official, formally approved formations.
Eidvin and Rundberg (2007) propose introduction of the new formations Ull og Eir in the Hordaland Group, and propose the extension of the Naust Formation into the North Sea. Eidvin et al 2013, 2014 proposes inor adjustments of rigg, Grid, Vade, Skade og Utsira Formations.
The mudstones of the Hordaland Group correlates with the Horda and Lark Formations of the Stronsay and Westray Groups of Knox and Holloway (1992) in the UK sector. For practical reasons and if need arises, the NPD suggests that the names Horda and Lark Formations be used informally as a subdivision of the Hordaland Group in the Norwegian sector. These names are indicated in blue letters and brackets in the 2014 NPD chart for the Norwegian North Sea.
Brunstad et al. (2013) propose introducing the new units Egga, Sotra, Sula, Radøy and Odin in the Rogaland Group. These names appear in blue letters in the 2014 NPD chart for the Norwegian North Sea. Moreover, Brunstad et al. (2013) re-defined all sandstone units in the Rogaland Group to members, including those previously defined as formations. NPD, however, rank all these units, including the proposed new ones listed above, as formations in accordance with the formal status and customary application of the previously defined sandstone formations in the Rogaland Group.
In the southern part of the Norwegian-Danish Basin, some units may be correlated with the sandy units Kolga, Idun, Rind and Bor that are defined in the Danish sector by Schiøler et al. (2007). These names are indicated in blue letters and brackets in the 2014 NPD chart for the Norwegian North Sea.
For the purpose of easy reference, the stratigraphic position of the Herring and Flounder Formations of Johnson and Lott (1992) are indicated on the 2014 NPD chart for the Norwegian North Sea.
Gjelberg et al. (1999) introduced the name Egga Member for the sandy unit that forms the reservoir in the Ormen Lange Field. The name is in common use, but still informal. Considering the lateral extent and mappability of this unit, the NPD requests that the unit should have formation rank and that the informal name Egga Formation be used for this unit.
In the Facts Sheet on its website, NPD has informally defined the name Delfin Formation for the sandy units that occur within and interfinger with the Kvitnos and Nise Formations.
The occurrence of sand units within and interfingering with the Lange Formation have been known for many years. However, no peer review publications have proposed a specific nomenclature for these units. Therefore, the NPD retains the unspecific name “Intra Lange Sands” for these units until such publications are made.
Eidvin et al. (2013) propose the extension of the Naust formation of the Nordland Group into the Norwegian Barents Sea. The NPD requests this name to be used informally in the Barents Sea.