褐色粘土
褐色粘土-
石贞，Terracotta是用来制作这些陶俑的褐色粘土，这又是兵马俑英文名称的由来。
Well , I think the name comes from the fact that the figures are made with terracotta which is a kind of brown-orange clay .
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南山洞所有化石发现于洞内浅褐色砂质粘土中，堆积物第二层钙板层的铀系年龄为30&40ka。
All the fossils in Nanshan cave were collected from brown fine sandy-clay . Ages of U-series dating on the second flow-stone are around 30 to 40 ka .
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黄土与红褐色古土壤中粘土胶膜的形成及其意义
The Formation and Significance of Clay Film in Loess and Red paleosols