Abstract
Fossil diatoms or Bacillariophyta are microscopicunicellular organisms with siliceous cell–frustule consisting of two separate valves that play an importantrole in marine and lake sedimentation. The data ofdiatom analysis provide reliable spatial and temporalreconstructions of the natural environment and theclimate of past geological epochs [1].The possibility of investigation of fossil Bacillariophyta by the oxygen isotope method in order to obtainpaleoinformation was originally demonstrated by L.Labeyrie [2]. The plotted isotope curves indicate variations in the temperature and isotope composition ofwater (δ
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