更新世中期 meaning in Chinese

chingsui age

The late pleitocene was the essential duration for the planation of the region , when the basic frame - work of the present geomorphology of beijing plain was constructed
更新世中期本区湖沼广布。更新世晚期是本区平原化的主要时期。塑造了北京平原现时地貌的基本格架。
The time corresponding to the four parts along the section are as follows : the top lake - swamp sediments : holocene ; the uppart fine sand : later late pleistocene ; the middlepart sandy clay : middle - early late pleistocene ; the lowpart clayer silt : later - middle - pleistocene . the fossils and stone artifacts found in salawusu site should be formed during the last but one glacier , its age range is about 0 . 13 - 0 . 19 ma , and belongs to later middle - pleistocene
分析q曲线与氧同位素曲线的一致性以及以上研究结果，包含萨拉乌苏地层的这套沉积物的沉积时代为：顶部湖沼相沉积物：全新世；上部具交错层理的细砂：晚更新世晚期；中部粉砂质粘土：晚更新世中期至早期；下部粘土质粉砂：中更新世晚期。