quaternary glacial period造句

• Studies of the petrology , textures and structures , depositional environment , contained fossils and age of the fluvial - lacustrine deposits indicate that they are the earliest record of the epiglacial area of the quaternary glacial period , representing the lower boundary of the quaternary glacial period
  对该河湖相沉积的岩石、结构构造、沉积环境、所含化石特徵和形成时代等的研究表明，它是第四纪冰期冰缘区的最早沉积记录，也是第四纪冰期的下限。