Calcareous nannofossils and sedimentary facies in the Upper Cretaceous Bozeş Formation (Southern Apuseni Mountains, Romania)

Authors

Ramona Balc, Faculty of Environmental Sciences and Engineering, Babes-Bolyai University, Cluj-Napoca, RomaniaFollow
Lóránd Silye, Department of Geology, Babes-Bolyai University, Cluj-Napoca, RomaniaFollow
Luminita Zaharia, Department of Geology, Babes-Bolyai University, Cluj-Napoca, RomaniaFollow

Abstract

The lithology, sedimentology and biostratigraphy of the Bozes Formation, which crop out in the SE Metaliferi Mountains (Apuseni Mts.) have been investigated in order to establish the age of the deposits and the depositional environment.

The sedimentary structures and facies are interpreted as indicating a deep-water depositional environment, representing part of a submarine fan lobe. Three facies assemblages have been identified and described. Calcareous nannofossils were used to determine the age of the investigated deposits. The presence of Lucianorhabdus cayeuxii and Calculites obscurus indicates the CC17 biozone, while UC13 Zone is pointed out by the continuous occurrence of Arkhangelskiella cymbiformis and the absence of Broinsonia parca parca. Thus, the age of the studied deposits is Late Santonian -?Early Campanian.

Recommended Citation

Balc, Ramona; Silye, Lóránd; and Zaharia, Luminita (2012) Calcareous nannofossils and sedimentary facies in the Upper Cretaceous Bozeş Formation (Southern Apuseni Mountains, Romania), Studia UBB Geologia 57 (1): 23-32
DOI: http://dx.doi.org/10.5038/1937-8602.57.1.3
Available at: https://digitalcommons.usf.edu/geologia/vol57/iss1/art3