Aptian–Campanian ammonites of Hungary by Szives O., Csontos L., Bujtor L., Fözy I.

By Szives O., Csontos L., Bujtor L., Fözy I.

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SOWERBY, 1820 Phylloceras sp. Material. Six fragments in bad state of preservation. Description. Eroded fragments with a typical phylloceratid sculpture, involute umbilicus and high whorl section. Discussion. Fragments are too eroded for specific identification. Occurrence. The genus occurs in the condensed Late Aptian basal pockets of Tata Limestone Formation, otherwise the genus Phylloceras is known from the Berriasian to Maastrichtian with worldwide distribution. Subgenus Hypophylloceras SALFELD, 1924 Type species: Phylloceras onoense STANTON, 1895 Phylloceras (Hypophylloceras) subseresitense WIEDMANN, 1963 Pl.

Internal moulds are made of a phosphatic, glauconitized marly grey limestone. Matrix between the moulds often contains a centimetre sized black pebbles and carbonized plant remains. In most cases moulds are entire, slightly eroded ones, without any sign of flattening or other marks of deformation. The accompanying fauna contains lots of echinoids, belemnites and gastropods. Bivalves are rare. A half dozen of nautilids also were found. The ammonite assemblage of Kálvária Hill encompasses almost the entire spectrum of a Middle – Upper Aptian fauna together with its whole startigraphic range.

The Kálvária Hill section starts with the Triassic Dachstein Limestone and ends with the Albian grey siltstone. Geological investigation of the fossiliferous red Jurassic strata started in the early XIXth century (BEUDANT 1822) although TOWNSON (1797) also mentioned Tata as a Text-Figure 15. Simplified map city “built on red marble”. In the early XXth century the best Hungarian geologists of Tata localities. Sections numand palaeontologists worked on the Cretaceous grey crinoidal limestone, as LÓCZY bered as follows: 1 — Vájáriskola, Sen.

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