Prussian Formation

Prussian Formation
Stratigraphic range: Eocene, 56–35 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Outcrop of the Prussian Formation in Yantarny, Russia
Type	Geological formation
Sub-units	Blue Earth Member
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.^[1] It holds 90% of the world's amber supply and Baltic amber is found exclusively in the Prussian Formation.^[2]

The Prussian Formation is equivalent to the Obukhov Formation of Ukraine and Belarus.