upper strata

Results from petroleum explorations for nearly four decades in the South Yellow Sea indicate that in the Yangtze massif, are developed a complete set of Mesozoic-Paleozoic marine strata with large thickness and wide distribution, and only upper Silurian and lower Devonian are absent.

南黄海海域油气勘探近40年成果证实，处于扬子地块之上，除缺失志留系上统和泥盆系下统，发育了较完整的中、古生代海相地层，厚度大，分布广。

The Upper Cretaceous Azile, Anguille, Pointe-Clairette and Point-Gentile Formations are the oldest strata drilled at the X Block in Gabon.

加蓬×区块钻遇的最老地层是上白垩统，自下而上分为Azile组、Anguille组、Pointe-Clairette组及Point-Gentile组。

What pen could describe it? Who could portray the effects of this light through these translucent sheets of water, the subtlety of its progressive shadings into the ocean's upper and lower strata?

无论多么高明的妙笔也描写不出来！谁能描绘光线穿过透明的水流所产生的新奇景色呢守谁能描绘那光线照在海洋上下两方，渐次递减的柔和光度呢！

The iron bearing formations mainly occur in the Middle and, especially, Upper Devonian strata.

含矿建造主要赋存于中上泥盆统, 而以上泥盆统为主.

They handled 30-50 outpatients a day, and mainly served the nobles, feudal lords and upper-strata lamas.

每天看30到50人次, 主要是为贵族 、 领主和上层喇嘛服务的.