Prussian Formation

Prussian Formation
Stratigraphic range:
Outcrop of the Prussian Formation in Yantarny, Russia
TypeGeological formation
Sub-units
  • Blue Earth Member
  • White Wall Member
  • Upper Quicksand Member
UnderliesPalvé Formation
OverliesAlka Formation
Thicknessup to 16 metres (52 ft)
Lithology
PrimaryPhosphorite, amber, glauconite, clay
OtherQuartz, feldspar
Location
LocationKaliningrad Oblast
CountryRussia
Type section
Named forPrussia
RegionSambian 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.

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