Tor Formation

The Tor Formation is a geological formation of late Campanian to Maastrichtian (uppermost Cretaceous) age. It forms the part of the Chalk Group in the North Sea. It is an important reservoir for oil and gas in fields such as Valhall. It overlies the Hod Formation. It underlies the Ekofisk Formation with local evidence of unconformity.^[1][2][3]

Tor Formation
Stratigraphic range: Late Cretaceous Late Campanian–Maastrichtian PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of	Chalk Group
Underlies	Ekofisk Formation
Overlies	Hod Formation
Thickness	up to 472 metres (1,550 ft)
Lithology
Primary	Chalk
Location
Region	North Sea
Country	Denmark, Norway & United Kingdom
Type section
Named for	Tor field
Location	Well 1/3-1. Norwegian sector

See also

• Tyne, Trent and Tors gas fields
• Tor oil field