TY - JOUR N2 - In Butkov Quarry, ammonites of the families Holcodiscidae Spath, 1923 and Barremitidae Breskovski, 1977 occur in the pelagic Lower Cretaceous pelagic deposits of the Manín Unit. This contribution discusses the taxonomy of both families and presents their distribution in the layered sequences of the quarry. The genus Spitidiscus Kilian, 1910 classified as a member of the Superfamily Perisphinctoidea Steinmann in Steinmann and Döderlein, 1890 is an important representative of the Holcodiscidae from a stratigraphic point of view. In areas where the zonal index Acanthodiscus radiatus (Bruguière, 1789) does not occur, as in Butkov Quarry, the first representatives of Spitidiscus indicate the base of the Hauterivian. The genus Plesiospitidiscus Breistroffer, 1947 was long regarded as a member of the Superfamily Desmoceratoidea Zittel, 1895. This superfamily was based on its type species, Eodesmoceras celestini (Pictet and Campiche, 1860), which is not Valanginian in age, as now clearly proven. As a consequence, this superfamily is considered invalid. Vermeulen and Lahondère (2011) proposed an alternative by selecting a suitable initial genus, namely Plesiospitidiscus, for the Family Barremitidae, Superfamily Barremitoidea Breskovski, 1977 ( nom. transl. Vermeulen and Lahondère, 2011). L1 - http://journals.pan.pl/Content/117603/PDF/4_Vasicek.pdf L2 - http://journals.pan.pl/Content/117603 PY - vol. 71 IS - No 4 EP - 451 DO - 10.24425/agp.2020.134563 KW - Early Cretaceous KW - Ammonites KW - taxonomy KW - stratigraphy KW - Manín Unit KW - Carpathians A1 - Vašíček, Zdeněk A1 - Klein, Jaap PB - Komitet Nauk Geologicznych PAN PB - Wydział Geologii UW DA - 2021.11.17 T1 - On imperfectly known Hauterivian representatives of the families Holcodiscidae Spath, 1923 and Barremitidae Breskovski, 1977 in Butkov Quarry (Central Western Carpathians, Slovakia) SP - 433 UR - http://journals.pan.pl/dlibra/publication/edition/117603 T2 - Acta Geologica Polonica ER -