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AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA GEOLOGIA - Ediţia nr.1 din 2011 | |||||||
Articol: |
NEW DATA ON THE UPPER JURASSIC – LOWER CRETACEOUS LIMESTONES FROM BIHOR MOUNTAINS: CASE STUDY OF GÂRDA SEACĂ - HODOBANA REGION, ROMANIA. Autori: EMANOIL SĂSĂRAN, IOAN I. BUCUR. |
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Rezumat: This study reconsiders problems regarding lithological succession, facies, and carbonate microfacies, and the biostratigraphic markers of the Upper Jurassic-Lower Cretaceous carbonates from the Bihor Mountains. Three types of facies (external marginal, subtidal, and peritidal) were separated for the Upper Jurassic, and two (coastal-peritidal and open shelf) for the Lower Cretaceous carbonates. The micropaleontological assemblages identified contain species that allow the separation of the two formations of different age: Labyrinthina mirabilis, Kurnubia palastiniensis, Neokilianina rahonensis, Clypeina sulcata (Kimmeridgian-Lower Tithonian) and Parakoskinolina? jourdanensis, Montseciella arabica, Palorbitolina lenticularis, Falsolikanella danilovae (Barremian-Lower Aptian). Field observations and data obtained from studies of thin sections and polished slabs indicate that a large part of the Triassic (Ladinian-Lower Carnian) and Lower Cretaceous limestones from Gârda Seacă-Hodobana region, delimited on the geological maps 1:50.000 scale, sheets 56b (Poiana Horea) and 56d (Avram Iancu), belongs in fact to the Upper Jurassic carbonate succession. Key words: Carbonate microfacies and facies, biostratigraphy, Upper Jurassic-Lower Cretaceous limestone, Bihor Mountains, Romania. |
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