quaternary climate造句

• In the warm period , the aquatic bivalvia was well - developed , and the gastropod fauna was obviously prosperous and characteristic by large amount of the aquatic species . the alternative appearance of both cold and the warm mollascan assemblage tpyes reflects the features of the quaternary climate changes in this area
  在冷期因气候干燥，环境中水量减少，腹足类化石以陆生肺螺类最为发育；在暖期水生双壳类较为发育，腹足类群明显繁盛，以水生种类的大量出现为特征。