Prussian Formation
| Prussian Formation | |
|---|---|
| Stratigraphic range: Eocene, | |
| Type | Geological formation |
| Sub-units |
|
| Lithology | |
| Other | Phosphorite, Amber, Glauconite |
| Location | |
| Location | Kaliningrad Oblast, Russia |
| Type section | |
| Region | Sambian Peninsula |
The Prussian Formation, previously known as the Amber Formation, is a geologic formation in Prussia, today mostly Kaliningrad Oblast that dates to the Eocene. It holds 90% of the world's amber supply and Baltic amber is found exclusively in the Prussian Formation.
The Prussian Formation is equivalent to the Obukhov Formation of Ukraine and Belarus.