科学家们已经确定，在埃塞俄比亚阿法尔地区干燥河床的细颗粒沉积物中发现的具有锋利边缘的石片存在于252万至260万年前。
Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago.
大多数元素以陆源为主，粘土(或细颗粒沉积物)是控制底质金属含量的主要因素。
Elements are mainly terrigenous, clay (or fine muddy matter) is the major factor controlling the concentrations of heavy metals in sediments.
大多数元素以陆源为主，粘土(或细颗粒沉积物)是控制底质金属含量的主要因素。
Elements are mainly terrigenous, clay (or fine muddy matter) is the major factor controlling the concentrations of heavy metals in sediments.
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