Studia Geologica Polonica  vol. 123 (Abstracts)

Toarcian, Aalenian and Early Bajocian (Jurassic) ammonite faunas and biostratigraphy in the Pieniny Klippen Belt and the Tatra Mts, West Carpathians

Ryszard Myczyński

Abstract
The ammonite faunas here described were derived from the Toarcian (Lower Jurassic) and Lower Bajocian (Middle Jurassic) strata of the Pieniny Klippen Belt and the Lower Subtatric Succession, Polish Tatra Mts (West Carpathians). The ammonites belong to the families: Phyllo- ceratidae, Lytoceratidae, Hildoceratidae, Graphoceratidae, Hammatoceratidae, Sonniniidae, Otoiti- dae and Stephanoceratidae. The associated bivalve faunule is represented by the families Inocera- midae and ?Posidoniidae.
Stratigraphic evaluation of the ammonite assemblages helped to redefine age ranges of some lithostratigraphic units in the Pieniny Klippen Belt and the Lower Subtatric Succession, Tatra Mts.

Key words: Pieniny Klippen Belt, Tatra Mts, biostratigraphy, Early-Middle Jurassic, ammonites, bivalves.

Studia Geologica Polonica, 123: 133-197.

Ammonite-supported microfossil and nannoconid stratigraphy of the Tithonian-Hauterivian limestones in selected sections of the Branisko Succession, Pieniny Klippen Belt (Poland)

Andrzej Pszczółkowski & Ryszard Myczyński

Abstract
The studied sections of the Tithonian-Hauterivian deposits of the Branisko Succession in the Polish part of the Pieniny Klippen Belt (Figs 1-7) yielded micro-, nanno- and macrofossils, which allowed to elaborate more detailed stratigraphy of these strata, especially in the lowermost Cretaceous interval of the Pieniny Limestone Formation. The calpionellids, radiolarians and other microfossils (mainly calcareous dinoflagellate cysts) were studied in thin sections, whereas the calcareous nannofossils were analysed under SEM. The Berriasian-Hauterivian ammonites are described and illustrated.
In the Kapuśnica I section, the Upszar Limestone Member of the Czorsztyn Limestone Formation seems to be exclusively of Tithonian age. At present, the Upper Tithonian deposits of the Crassi- collaria Standard Zone are missing in the studied section. In the Łysonka Klippe, the Lower Berriasian limestones are subdivided on the basis of the Nannoconus assemblages. The ammonites of the Jacobi Zone occur in the limestones of the N. steinmannii steinmannii Zone. In the Kapuśnica I section, the sedimentation rate of the limestones assigned to the Elliptica Subzone was about 1.3 m/Ma. The Oblonga Subzone (sensu lato) coincides with the marly deposition episode in this section; the Łysonka Marl Bed is assigned to the lower interval of this subzone. However, the overall sedimentation rate during the Late Berriasian Oblonga Subzone was low (about ~1.7 m/Ma). Presence of the ammonite Tirnovella otopeta Zone was documented in the Kapuśnica II and Łysonka sections. In the Kapuśnica II section, the minimum value of sedimentation rate of the radiolarian-calpionellid limestones assigned to the Lower Valanginian Calpionellites Zone is about 4.1 m/Ma. The Tintinno- psella Zone of the uppermost Lower Valanginian-Hauterivian is represented by a limestone succe- ssion about 51 m thick. In the Łysonka section, the Upper Valanginian limestones of this zone are probably older than those exposed in the Zaskale section. In the latter section, some ammonites are indicative for the Upper Valanginian Criosarasinella furcillata Zone. In the upper part of the Kapuśnica II section, the limestones of the Tintinnopsella Zone yielded Olcostephanus sp. and Neolissoceras desmoceratoides (Wiedmann) found 4.5 m below the top of this section. These ammonites indicate the Early Hauterivian age of the sparsely fossiliferous limestones. The Upper Hauterivian deposits may be represented in the topmost limestones of the Kapuśnica II section.

Key words: Pieniny Klippen Belt, Branisko Succession, Pieniny Limestone Formation, Łysonka Marl Bed, Czorsztyn Limestone Formation, Upszar Limestone Member, Tithonian-Hauterivian, calpionellids, ammonites, radiolarians, nannoconids, biostratigraphy

Studia Geologica Polonica, 123: 199-222.

Eocene dinoflagellate cysts from exotic clasts in a submarine slump, Podhale Flysch (Oligocene), at Leśnica Stream, Central Carpathians, Poland

Przemysław Gedl

Abstract
Sixty dinoflagellate cyst taxa have been found in Middle to Late Eocene marl clasts that occur in an exotic-bearing submarine slump within the Lower Oligocene Szaflary beds (Podhale Flysch, Inner Carpathians, Poland). Eocene dinoflagellate cyst assemblages are evidenced for the first time from these deposits. Their taxonomic composition is compared with previously described Oligocene dinocyst assemblages from the Podhale Flysch. On this basis, different palaeoenviron- mental conditions during Middle-Late Eocene and Oligocene in Central Carpathian basin are suggested.

Key words: Eocene, Oligocene, redeposited dinoflagellate cysts (dinocysts), biostratigraphy, Podhale Palaeogene, Inner Carpathians, Poland.

Studia Geologica Polonica, 123: 223-243.

Dinoflagellate cysts from the Šambron beds (Central Carpathian Palaeogene), Slovak Orava

Przemysław Gedl

Abstract
Sixty-one dinoflagellate cyst taxa have been found in fine-grained deposits of the Šambron beds that occur below and above the Pucov Member (Central Carpathian Palaeogene, Slovakia). These deposits have been studied from two localities at Orava: Zadný Krnáč and Pucov. Age-assess- ment of the dinocyst assemblages suggests their latest Middle-Late Eocene age. Two dinocyst assemblages of different composition have been recognized. The Impagidinium-dominated assem- blage reflects offshore depositional conditions, whereas the Homotryblium-dominated one represents inshore palaeoenvironment. Scarcity of Peridiniales in these dinocyst assemblages presumably reflects low nutrient availability, whereas their co-occurrence with oligotrophic species may result from surface water stratification.

Key words: Central Carpathian Palaeogene, Šambron beds, Pucov Member, Eocene, dinoflagellate cysts, biostratigraphy, palaeoenvironment

Studia Geologica Polonica, 123: 245-277.

Dinocyst ages of some Jurassic strata, Grajcarek Unit at Sztolnia Creek, Pieniny Klippen Belt (Poland)

Krzysztof Birkenmajer & Przemysław Gedl

Abstract
Dinocyst assemblages recovered from Jurassic strata of the Grajcarek Unit, Pieniny Klippen Belt, Poland, add new important data on their stratigraphic ages. The Jurassic ages of the Szlachtowa Formation flysch strata (Toarcian-Aalenian) and the Opaleniec Formation (Bajocian), already based on age-diagnostic macro-, micro- and nannofossils, have been confirmed. A critical evaluation of the age and field data presented in a recent paper by Oszczypko et al. (2004), who tried to prove a Cretaceous age of the Szlachtowa Formation ("black flysch") and the Opaleniec Formation, is given.

Key words: Dinocysts, Jurassic, Cretaceous, Grajcarek Unit, Pieniny Klippen Belt, West Carpathians.

Studia Geologica Polonica, 123: 279-294.

Age relationships between Miocene volcanism and hydrothermal activity at Mt Jarmuta, Pieniny Klippen Belt, West Carpathians (Poland)

Krzysztof Birkenmajer*, Zoltán Pécskay** & Wojciech Szeliga***

Abstract
In the Pieniny Volcanic Arc (Miocene), the northernmost volcanic arc of the West Carpathians, hydrothermal activity produced some ore-bearing veins associated with moderate-size andesite intrusions. They were subjected to prospecting and mining for gold, silver and lead for a short period at the beginning of the 18th century. K-Ar dating of secondary chlorine-biotite from the mineralized zone at Mt Jarmuta, yielded a K-Ar date of 11.35±0.45 Ma. This K-Ar date fits well with the average K-Ar age (11.34±0.50 Ma) obtained on unaltered andesite sills exposed at Mt Jarmuta. It indicates a close age-relationship between the emplacement of the andesite intrusion and the subsequent ore-mineralization during Miocene (Sarmatian) time.

Key words: K-Ar dating, Miocene (Sarmatian), hydrothermal activity, Mt Jarmuta, Pieniny Klippen Belt, West Carpathians