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Full-Text Articles in Earth Sciences
Origin, Evolutionary Classification, And Biostratigraphic Significance Of The Late Cretaceous Planktic Foraminiferal Directional Lineage Bollitruncana O.A. Korchagin, 2001, Marius Dan Georgescu
Origin, Evolutionary Classification, And Biostratigraphic Significance Of The Late Cretaceous Planktic Foraminiferal Directional Lineage Bollitruncana O.A. Korchagin, 2001, Marius Dan Georgescu
Studia UBB Geologia
Taxonomic revision of the genus Bollitruncana O.A. Korchagin, 2001 shows that it accommodates a directional lineage, which consists of two species: B. carpathica (Scheibnerová, 1963) and B. posthelvetica (Hanzliková, 1963). Bollitruncana directional lineage is restricted to Turonian. A new planktic foraminiferal biozone is recognized in the Turonian, namely the Bollitruncana carpathica Biozone.
A Study On The Geology Of The Ţaga Region (Cluj District), Ioan MâRza
A Study On The Geology Of The Ţaga Region (Cluj District), Ioan MâRza
Studia UBB Geologia
The geological formations from Ţaga area (Cluj District) are Sarmatian in age (in outcrops) and Badenian (under surface). Lithologically, they are represented mainly by sands and sometimes fine sediments (clays, marls), interbedded with volcanic tuffs a low fossil content. The Badenian is the host of gas accumulations, concentrated in dome structures.
A Revision Of The Rona Member, Vlad A. Codrea, Emanoil SăSăRan
A Revision Of The Rona Member, Vlad A. Codrea, Emanoil SăSăRan
Studia UBB Geologia
Lacustrine deposits occurring in the Jibou Formation (Late Maastrichtian – Lutetian) were mentioned in the Rona village area since the first half of the 19th century. Hungarian and Romanian geologists also carried out several researches in the last century, referring to the so-call “Rona Limestone” or “Rona Member”. In the last years, new outcrops resulted as a consequence of works made for the Botanical Garden at Jibou, adding details concerning mainly the base of the lacustrine succession. The new geological section from Jibou Botanical Garden should complete the old stratotype of the "Rona Limestone”, as a hypostratotype.
Lower Cretaceous Calcareous Nannofossils From The Southern Apuseni Mountains, Romania, Ana-Maria Vulc
Lower Cretaceous Calcareous Nannofossils From The Southern Apuseni Mountains, Romania, Ana-Maria Vulc
Studia UBB Geologia
We investigated Lower Cretaceous calcareous nannofossils from Southern Apuseni Mts. The studied section from Bucium Cerbu quarry is characterized by flysch deposits (rhythmical interbedded marls and sandstones), which were assigned to the Căbeşti Formation. The studied nannofossil assemblages yielded a high diversity. The Early Aptian age of the studied deposits was assigned based on both the Tethyan and Boreal calcareous nannofossil zonations. Several reworked Valanginian nannofossils were also observed in the Early Aptian in situ nannofloras. The nannofloras are dominated by tethyan and cosmopolitan species. Besides Boreal species are also present. The presence of boreal taxa (e.g. Kokia borealis, K. …
Biostratigraphy Of The Cenomanian-Turonian Boundary In The Eastern Carpathians (Dâmboviţa Valley): Preliminary Observations, Claudia Cetean, Ramona Balc, Michael A. Kaminski, Sorin Filipescu
Biostratigraphy Of The Cenomanian-Turonian Boundary In The Eastern Carpathians (Dâmboviţa Valley): Preliminary Observations, Claudia Cetean, Ramona Balc, Michael A. Kaminski, Sorin Filipescu
Studia UBB Geologia
Planktonic and benthic foraminiferal assemblages from an Upper Albian to Lower Turonian interval in the East Carpathians were investigated in a well and in an outcrop from the Stoeneşti – Cetăţeni area (Dâmboviţa Valley), Romania. The benthic foraminiferal extinction that occurred at the Cenomanian/Turonian boundary and the first stage of the faunal recovery are documented here for the first time in the Romanian Carpathians. Bioevents and changes in the foraminiferal record from this area show that low oxygen conditions occured already in the Late Cenomanian, as suggested by the presence of radiolarian-rich shales. Impoverished assemblages of small, thin walled agglutinated …