A boreal ostracod assemblage from the Callovian of the Lukow area, Poland

Excellently preserved ostracods from large blocks of the late Callovian (Qu enstedtoceras lamberti Zone) black clays occurring within glacial drift nea r Lukow, eastern Poland, are described. Unlike coeval faunas from other loc alities in Poland, the Lukow ammonite assemblage exhibits boreal affinities . The ostracod fauna broadly resembles those of the British Isles and north western Germany, there are also some similarites to Central Russia and nort hwestern Poland. Seventeen ostracod species are reported, and Schuleridea ( Eoschuleridea) lukoviensis sp. n. is proposed. The ostracod assemblage is d ominated by large number of specimens of Nophrecythere and Schuleridea (Eos chuleridea). The ostracods are of late Callovian age as indicated by the pr esence of Nophrecythere triebeli, Progonocythere callovica and advanced evo lutionary forms of Nophrecythere intermedia and Terquemula lutzei. The most probable source of the Lukow clay blocks seems to be from the bed of the B altic Sea north of Gdansk.