middle ordovician epoch

基本解釋

• [地球科學(xué)]中奧陶世

英漢例句

雙語(yǔ)例句

• That a: The Mn-deposits of Middle Ordovician Epoch in central Hunan were high grade Mn-ores with low-P, low-Fe and high basicity;
  提出：①湘中地區(qū)中奧陶世錳礦是低磷、低鐵、高堿度優(yōu)質(zhì)錳礦石；
• Comprehensive researches have concluded that the Heishan ophiolite was formed in Nanhua Ordovician period and its structural location in Silurian period early Middle Devonian epoch.
  綜合研究得出黑山蛇綠巖形成于南華—奧陶紀(jì)，構(gòu)造就位于志留紀(jì)—早中泥盆世。

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專業(yè)釋義

地球科學(xué)

• 中奧陶世