The most famous source of the fossil insects of the best preservation is collected in bulk since antiquity re-deposited along the eastern part of the south beach of Baltic. The least re-deposited is probably the amber dug out from so called blue earth (Prussian Formation) of Late Eocene age. The original source of the resin is supposed to be open mixed pine forests that covered the Scandinavian Shield territory in the Eocene times. The number of fossils collected is innumerable, and that of the insect species described or indicated is near 3,000. For details see LARSSON (1978), ZHERIKHIN (1978, 1998), POINAR (1992a), GRIMALDI (1996), and WEITSCHAT & WICHARD (1998).