| Balder Formation | |
| Type: | Formation |
| Age: | Earliest Eocene ~ |
| Period: | Ypresian |
| Prilithology: | Mudstone, tuff |
| Otherlithology: | Sandstone |
| Namedfor: | Balder, Norse deity |
| Region: | Offshore; subsurface |
| Country: | |
| Unitof: | Moray Group |
| Underlies: | Horda, Mousa or Tay Formation |
| Overlies: | Sele or Dornoch Formation, Montrose Group |
| Thickness: | 30- |
| Extent: | Central and northern North Sea, Faroe-Shetland Basin |
The Balder Formation is a geological formation of lowermost Eocene in age, found in the Central and Northern North Sea and Faroe-Shetland Basin.[1] The formation is named after Balder, a god from Norse mythology. Layers of tuff are found, particularly at the base of the unit, deposited by airfall from volcanoes associated with the North Atlantic Igneous Province.[2]