Nihewan beds" means the Quatemary sediments on the top of the "Red clay" inNihewan basin.
“泥河湾层”是指泥河湾盆地位于三趾马红土之上的一套第四纪河湖相沉积。
参考来源 - 泥河湾盆地层序地层学与磁性地层学综合研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The modem karst formation started in the old Tertiary Period, and matured in the Quatemary Period.
现代岩溶的形成开始于老第三纪，成熟于第四纪。
Placer tin deposit in xupu occurs in alluvial sediment of quatemary system and cassiterite chiefly concentrates at the bottom of gravel layers.
溆浦砂锡矿床赋存在第四系冲积层中锡石主要富集在底部砂砾石层。
Placer tin deposit in Xupu occurs in alluvial sediment of Quatemary SyStem and CaSSiterite chiefly concentrates at the bottom of Gravel layers.
溆浦砂锡矿床赋存在第四系冲积层中，锡石主要富集在底部砂砾石层。
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