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    STUDIA GEOLOGIA - Issue no. 1 / 2007  
         
  Article:   SEASONAL FLUCTUATIONS IN THE PAST 5000 YEARS: STABLE ISOTOPE RECORD OF MOLLUSCAN SHELLS (BALATON REGION, HUNGARY).

Authors:  PÁL SÜMEGI, ISTVÁN FÓRIZS, GABRIELLA BARNA, ATTILA DEMÉNY. 		 
       
         
  Abstract:  Shell carbonate (Unionidae sp.) from archaeological excavations located at Ordacsehi (Southern part of the catchment area of the Lake Balaton, Central Hungary) were analyzed for stable C and O isotope compositions in order to obtain environmental and climatic information from the catchment area of Lake Balaton for the last 5000 years. Shell material from seven periods from Late Copper Age (~5000 yr BP) to Roman age (~12 yr BC to 400 yr AD) were studied in the same area. Beside bulk shell samples that reflect major climatic changes, sampling was conducted at cca. 1 mm resolution allowing observation of seasonal variabilities. As a comparison, shell material dated back to the Riss-Würm period was also studied in order to show variations related to glacial conditions.  
         
     
         
         
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