This amber was deposited in the late Eocene and early Oligocene in a delta of a prehistoric river, in a shallow part of a marine basin. In addition to the coast near Kaliningrad, amber is also found elsewhere in the Baltic Sea region. Small amounts of Baltic amber can even be found outside the Baltic region, for example on the coastline of the south east of England. On the evidence of Fourier-transform infrared microspectroscopy (FTIR) analysis of amber and resin from living trees, that conifers of the family Sciadopityaceae were responsible. The only living representative of this family is the Japanese umbrella pine, "Sciadopitys verticillata". 