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

Authors

Valentin Turi, Faculty of Geology and Geophysics, University of Bucharest, RomaniaFollow
Emanoil Sasaran, Department of Geology, Babes-Bolyai University, Cluj, RomaniaFollow
Ioan I. Bucur, Department of Geology, Babes-Bolyai University, Cluj, RomaniaFollow

Abstract

This study refers to some problems regarding the lithological succession, facies and carbonate microfacies, and to biostratigraphic markers of the Upper Jurassic-Lower Cretaceous carbonates from Bihor Mountains. Three types of facies (external marginal facies, subtidal and peritidal facies) were separated for the Upper Jurassic, and two (coastal-peritidal and open shelf facies) 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 on 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) (Bleahu et al., 1980; Dimitrescu et al., 1977), belong in fact to the Upper Jurassic carbonate succession.

Recommended Citation

Turi, Valentin; Sasaran, Emanoil; and Bucur, Ioan I. (2011) New data on the Upper Jurassic–Lower Cretaceous limestones from Bihor Mountains: case study of Gârda Seacă-Hodobana region, Romania, Studia UBB Geologia 56 (1): 11-27
DOI: http://dx.doi.org/10.5038/1937-8602.56.1.2
Available at: https://digitalcommons.usf.edu/geologia/vol56/iss1/art2