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.
5-689: The Prussian Formation is equivalent to the Obukhov Formation of Ukraine and Belarus . In situ Baltic amber is found within the Prussian Formation, with the main amber bearing horizon being referred to as "Blue Earth", so named due to its glauconite content. The formation is exposed in the northern part of the Sambia Peninsula in Kaliningrad. Different authors have given estimates of 40-47 million years ago and 35-43 million years ago as
10-613: Is found in this formation, and 90% of amber collected from the Obukhov Formation is extracted illegally and the trade is controlled by armed organised crime groups. The Late Eocene Rovno amber is hosted in the Obukhov Formation, and it underlies the Early Oligocene Mezhigorje Formation . The formation is found along the northwestern margin of the Ukrainian Crystalline Shield exposed in
15-524: The Rivne region of Ukraine and across the border near Rechitsa in the Gomel Region of Belarus . The granite basement rock was overlain by sandy to clayey deposits that were host to alluvial amber. The two formations total between 2–7 m (6.6–23.0 ft) in thickness, both containing interbeds or mixtures of brown coals and carbonized vegetation. Both formations are sandy to clayey in texture, with
20-419: The age of the Prussian Formation. Numerous extinct genera and species of plants and animals have been discovered and scientifically described from inclusions in the Prussian Formation. Inclusions of insects make up over 98% of the animals preserved in the amber, while all other arthropods , annelids , molluscs , nematodes , protozoans contribute less than 0.5% of the animals. Vertebrates are another 0.5% of
25-602: The animals included and mostly are represented by mammal fur, feathers, and reptiles. This article about a specific stratigraphic formation is a stub . You can help Misplaced Pages by expanding it . Obukhov Formation The Obukhov Formation is a geologic formation in Belarus and Ukraine that dates to the Late Eocene ; the Obukhov Formation is equivalent to the Prussian Formation of Russia . Rovno amber
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