# Tor Formation

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> Source: https://en.wikipedia.org/wiki/Tor_Formation
> Source revision: 1318104028
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{{Short description|Geological formation of Danian (lowermost Paleocene) age}}
{{Infobox rockunit
| name           = Tor Formation
| period         = Maastrichtian
| age            = [Late Cretaceous](/source/Late_Cretaceous) Late {{fossilrange|Campanian|Maastrichtian}}
| image          = 
| imagesize      = 
| caption        = 
| type           = [Geological formation](/source/Geological_formation)
| prilithology   = [Chalk](/source/Chalk)
| otherlithology =
| unitof         = [Chalk Group](/source/Chalk_Group)
| subunits       = 
| underlies      = [Rødvig Formation](/source/R%C3%B8dvig_Formation) and [Ekofisk Formation](/source/Ekofisk_Formation)
| overlies       = [Hod Formation](/source/Hod_Formation)
| thickness      = up to {{Convert|472|m|ft|-1}}
| area           = 
| map            = 
| map_caption    = 
<!----Location---->
| location       = 
| coordinates    =  
| region         = [North Sea](/source/North_Sea)
| country        = [Denmark](/source/Denmark),  [Norway](/source/Norway) & [United Kingdom](/source/United_Kingdom)
| extent         = 
<!--Type section--->
| namedfor       = [Tor field](/source/Tor_field)
| namedby        = <!--Author of defining paper-->
| year_ts        = <!--Year of definition-->
| location_ts    = Well 1/3-1. Norwegian sector
| coordinates_ts = 
| paleocoordinates_ts = 
| region_ts      = <!--Region of type section-->
| country_ts     = <!--Country of type section-->
| thickness_ts   = <!--Thickness at type section-->
}}

The '''Tor Formation''' is a [geological formation](/source/formation_(geology)) of late [Campanian](/source/Campanian) to [Maastrichtian](/source/Maastrichtian) (uppermost [Cretaceous](/source/Cretaceous)) age. It forms the part of the [Chalk Group](/source/Chalk_Group) in the [North Sea](/source/North_Sea). It is an important [reservoir](/source/Petroleum_reservoir) for oil and gas in fields such as [Valhall](/source/Valhall_field). It overlies the [Hod Formation](/source/Hod_Formation). It underlies the [Rødvig](/source/R%C3%B8dvig_Formation) and [Ekofisk Formations](/source/Ekofisk_Formation) with [local evidence](/source/Fiskeler) of [unconformity](/source/unconformity).<ref name="NORLEX">{{Cite web |last=NPD |title=Tor Formation |url=https://nhm2.uio.no/norges/litho/tor.php |website=NORLEX|access-date=25 August 2022 }}</ref><ref name="BGS_Lexicon">{{Cite web |last=[British Geological Survey](/source/British_Geological_Survey) |title=Tor Formation |url=https://webapps.bgs.ac.uk/lexicon/lexicon.cfm?pub=TOR |access-date=26 August 2022 |website=The BGS Lexicon of Named Rock Units}}</ref><ref name="Blinkenberg_etal_2020">{{Cite journal |last=Blinkenberg |first=K.H. |last2=Anderskouv |first2=K. |last3=Sheldon |first3=E. |last4=Bjerrum |first4=C.J. |last5=Stemmerik |first5=L. |date=2020 |title=Stratigraphically controlled silicification in Danian chalk and its implications for reservoir properties, southern Danish Central Graben |journal=Marine and Petroleum Geology |volume=115 |doi=10.1016/j.marpetgeo.2019.104134}}</ref>

==See also==
* [Tyne, Trent and Tors gas fields](/source/Tyne%2C_Trent_and_Tors_gas_fields)
* [Tor oil field](/source/Tor_oil_field)

==References==
{{Reflist}}

Category:Geology of the North Sea

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Adapted from the Wikipedia article [Tor Formation](https://en.wikipedia.org/wiki/Tor_Formation) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Tor_Formation?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.