The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary

The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name.

  
       
         
    STUDIA GEOLOGIA - Issue no. 2 / 2008  
         
  Article:   LOWER CRETACEOUS CALCAREOUS NANNOFOSSILS FROM THE SOUTHERN APUSENI MOUNTAINS, ROMANIA.

Authors:  ANA-MARIA VULC. 		 
       
         
  Abstract:  We investigated Lower Cretaceous calcareous nannofossils from Southern Apuseni Mountains. 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. stelatta) in the Tethyan Realm reflects the palaeobiogeographical distribution and the biotic changes between Tethys and Boreal Realms in the Southern Apuseni Mountains. In the studied assemblages, the dominant species are Diazomatolithus lehmanii and Watznaueria barnesiae, which can reflect a high fertility in the surface water masses.

Key words: Lower Cretaceous; biostratigraphy; palaeobiogeography; palaeoecology; Apuseni Mountains, Romania. 		 
         
     
         
         
      Back to previous page