古生代的

But most split trace of samples with tapered profile had been cutted, of which some presented sharp implement with double side shaved, and some even obviously possessed bitted or scrapped "imprint".

结合地理环境和地学结构分析，猛虎洞可能属晚更新世(10~5)万年前旧石器人类穴居的营地或系同生代古脊推动物的遗址。

Based on analysises of characteristics of regional deformation and metamorphism as well as Carboniferous and Permian relict basins, think Qinling-Dabie orogenic belt might have undergone following Basin-mountain transformational process : the ocean basin developed in Silurian-early Paleozoic; ocean basin subduction began in Ordovician; Silurian-early Devonian continent-continent collision happened and the ocean basin disappeared; Carboniferous- Permian, with the strike-slip and pull-apart along the Shangdan fault, a series of small faulted basins formed on the north Qinling mountainous region composing of Pre-Carboniferous metamorphic stratum.

在解析区域变形变质特征，岩浆侵位的构造演化和北秦岭区石炭—二叠纪残余盆地分析基础上，认为秦岭—大别造山带现今的残余的加里东造山带，可能经历了震旦纪—早古生代洋盆发育，奥陶纪洋盆俯冲，志留纪—早泥盆世碰撞造山，洋盆消失，石炭—二叠纪沿商丹带走滑拉分断陷形成上叠于北秦岭加里东造山带之上的石炭—二叠纪沉积盆地的盆山转换过程。

These analysis show that southern Tianshan uplift and erosion extensively from Tertiary, as a result of which the provenance of blue schist in Paleozoic accretion from north margin of south Tianshan has been curtained. With deeply erosion of Tianshan, more and more high-grade metamorphic and igneous rocks are exposed.

由此可以认为南天山的大规模隆升和剥蚀发生在第三纪以来，由于它的隆升遮挡了南天山北缘古生代增生杂岩体对库车坳陷的物质贡献，并且随着剥蚀的加深，高级变质岩和火成岩的出露越来越多。

Based on 18 boxes of fossil specimens collected by the author from Xiaheyan, Zhongwei, Ningxia Hui Minority Autonomous Region and some other geological and palaeontological data from both Xiaheyan and the adjacent sections in the east sector of North Qilian Mountains, the present paper studies the botanical characteristics of Middel-Late Namurian Flora in Locality Xiaheyan and represents the primary reconstruction of the Middle-Late Namurian Flora in the Northeast Qilian Mountains, also tries to make available accounts for the correlation between the different Flora provinces, and discusses the origin time of Cathaysian Flora based on the succession and the transmissibility of the plants through the whole Namurian stage.

结合自从大学三年级一直到硕士研究生阶段笔者踏勘过的北祁连山东段地区十几条石炭系剖面，以及对相关文献的整理，笔者初步分析了北祁连山东段纳缪尔中晚期植物群的垂直演化分布情况，并完成了该期全球不同植物地理区系植物群植物学性质方面的简要比较。北祁连山东段地区纳缪尔早期与中晚期植物群的遗传性与继承性，加之华夏植物群的特征分子及一些东方型地方性分子在纳缪尔早期的出现，笔者认为这些无疑为晚古生代四大植物群之一的华夏植物群的起源完成于纳缪尔初期提供了有利证据。

T. Van Richthofen writes in his "Letters" of the earliest times in the history of our earth, when probably the entire east and north Asia were under the sea.

T。 Van Richthofen &书信&中的一段会让我们对庐山的地质结构有所了解--在最远古地球上，整个亚洲的东部和北部还深藏于海底，经过一个漫长的古生代，才慢慢从海底浮出，在石灰纪后期，中国从海底延伸出来的地方变得很干燥，而沉淀在深海不同区域的白色矿床不断地伸出海面，再没有沉入海底，也没有任何证据表明中国的任何一座山曾在侏罗纪、白奎纪和第三纪再一次沉人海面。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。