1. Upper Miocene ostracods from the Krško Basin, SE SloveniaMiha Marinšek, Valentina Hajek-Tadesse, Marijan Poljak, Tea Kolar-Jurkovšek, Luka Gale, 2023, izvirni znanstveni članek Povzetek: The purpose of this study was to identify the ostracod assemblage from a 43 m thick section of
the Bizeljsko Formation, which constitutes the middle part of the Upper Miocene Posavje Group.
The succession comprises sandstone, siltstone, and marlstone, deposited in a delta front environment. The determined ostracods belong to the families Cyprididae, Cytheridae, Darwinulidae, and Loxoconchidae. In total, 30 species were identified. Additionally, 8 morphotypes were determined at the genus level. The most common genera are Candona, Hemicytheria, and Cyprideis. The assemblage belongs to the Caspiocypris labiata subzone from the upper Pannonian.
The ostracod assemblage from the Krško Basin is similar in species composition to Pannonian ostracod assemblages from Croatia and Serbia.
Ključne besede: Lake Pannon, Bizeljsko Formation, Pannonian, biostratigraphy, palaeoenvironment
Objavljeno v DiRROS: 27.07.2023; Ogledov: 289; Prenosov: 147
 Celotno besedilo (8,96 MB) |
2. Spathian (Lower Triassic) conodonts from the Tirolites cassianus beds in Paleotethys-issued North Dobrogea Orogen (Romania)Tea Kolar-Jurkovšek, Yanlong Chen, Eugen Grǎdinaru, Bogdan Jurkovšek, 2023, izvirni znanstveni članek Povzetek: The paper documents a conodont fauna from Lower Triassic deposits of Paleotethys-issued North Dobrogea Orogen. The studied strata exposed in the Tulcea Veche Quarry are characterized by the presence of diversified molluscs, including the ammonoid Tirolites cassianus (Quenstedt) and the bivalve Crittendenia decidens (Bittner). The site also represents the type locality of the coelacanth fish Dobrogeria aegyssensis Cavin & Grădinaru. The recovered conodont fauna is marked by Icriospathodus crassatus (Orchard), Neospathodus robustispinus Zhao & Orchard, Novispathodus abruptus (Orchard), Nv. brochus (Orchard), Nv. aff. brochus (Orchard), Tr. ex gr. homeri (Bender), Tr. hungaricus (Kozur & Mostler), Tr. ex gr. hungaricus (Kozur & Mostler), Tr. symmetricus (Orchard), Tr. aff. symmetricus (Orchard), and Triassospathodus sp. that is correlated with the Tr. symmetricus Zone.
Ključne besede: biostratigraphy, Olenekian, Tulcea Veche Quarry, Romania
Objavljeno v DiRROS: 06.02.2023; Ogledov: 415; Prenosov: 130
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3. The Rigelj Formation, a new lithostratigraphic unit of the Lower Permian in the Karavanke Mountains (Slovenia/Austria)Matevž Novak, Karl Krainer, 2022, izvirni znanstveni članek Povzetek: The Rigelj Formation is a new lithostratigraphic unit of the Lower Permian Rattendorf Group in the Karavanke Mountains. The Formation is up to 105 m thick and mainly composed of siliciclastic and fossiliferous carbonate sediments that are entirely of shallow-marine setting. Conglomerates are interpreted as shoreface deposits, sandstones as deposits of the upper to lower shoreface, and fossiliferous siltstones as offshore deposits. Fossiliferous limestones were deposited in a shallow, open-marine shelf environment of moderate to low energy (wackestone, floatstone) and strong water turbulence (packstone, rudstone). The siliciclastic and carbonate lithotypes form some well-developed backstepping cycles starting with conglomerates, overlain by sandstones, siltstones and fossiliferous limestones that formed in an open shelf environment without siliciclastic influx. Similar sedimentary cycles are developed in the Grenzland Formation of the Carnic Alps.
The fusulinid fauna indicates that the Rigelj Formation ranges in age from the late Asselian to the middle Sakmarian. In the western Karavanke Mountains and near Trögern, the Lower Permian lithostratigraphic succession is very similar to the succession in the Carnic Alps with Tarvis Breccia resting on the Trogkofel Limestone and the Goggau Limestone. Unlike this, in the central part of the Karavanke Mountains (Dovžanova Soteska–Mt. Pleschiwetz/Plešivec area) the Rigelj Formation is erosively overlain by the Tarvis Breccia. The stronger diversification of the sedimentary environments within the Karavanke-Carnic Alps in the Lower Permian after the uniform sedimentation in the Upper Carboniferous can be attributed to block-faulting.
Ključne besede: Lower Permian, Southern Alps, Dovžanova soteska, Mt. Pleschiwetz / Plešivec, Clastic Trogkofel Beds, fusulinid biostratigraphy
Objavljeno v DiRROS: 25.08.2022; Ogledov: 553; Prenosov: 160
Celotno besedilo (3,45 MB) |
