就在那一年的十月月底，研究生亨利·吉尔伯特野外考察时在达卡沉积层上发现了一片头盖骨，随后该研究小组在头盖骨周围出土了一块重达四五十公斤的砂岩块，并用石膏和医用绷带包住带了回来。
Late in December 1997—a boom year for hominid fossils in the Middle Awash—graduate student Henry Gilbert noticed the top of a cranium eroding out of the Daka sediments.
用蒸汽在机械化澄清槽底部间接加热，使沉积于底部的重质焦油软化，减少刮板阻力。
Apply steam to heat the flushing-liquor decanter indirectly to soften the heavy tar depositing on the bottom of tank to decrease the drag of chain scraper.
此发现对研究海相岩层风暴沉积及其地层划分与对比具有十分重要的意义。
This discovery is very important for study of the storm deposits of the Marine and the division and correlations of the strata.
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