GRAIN-S亿E DISTRIBUTION CHARACTERISTICS AND SEDIMENTARY ENVIRONMENTS OF THE MAJOR SANDBODIES IN THE XISHAN COAL FIELD IN TAIYUAN

The Xishan Coal Field is the seat of the Permo一Carboniferous stratotype in N orth China. Many geologists think highly o`f it. The author has systematically studied about 300 grain-size samples of its major sandbodies by using the thin-section met- hod.The result of his study has proved that the sedimentary environments of the sandbodies are conformable with those made by other identification methods. And so the grain一size analyses are convincing.