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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.

New data on the Upper Jurassic-Lower Cretaceous limestones from Bihor Mountains: case study of Gârda Seacă-Hodobana region, Romania