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lower strata相关的网络例句

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The strata in this section cover three lithostratigraphic units, seven conodont zones, five ammonoid zones and three bivalve zones. Two normal and two reversed magnetic polarity zones as well as the cyclic sequences corresponding to the Milankovitch climate periods driven by the Earth's orbit are well recognized in the lower part of the section.

该剖面包括3个岩石地层单元、7个牙形石带、5个菊石带、3个双壳类带;在剖面下段地层中识别出2个正向磁性带和2个反向磁极性带;与地球轨道天文周期相对应的Milankovitch气候沉积旋回也可以明确地辨认;碳氧同位素δ13C演变呈现两次大的旋回。

The conodont study indicates that the thick carbonate rock strata belongs to the Majiagou Formation of the Middle Ordovician. The Upper part of the formation has the conodont fossil Erraticodon tangshanensis, the lower part is represented by Tangshanodus tangshanensis.

牙形石研究表明这套厚层质纯的碳酸盐岩地层属于中奥陶统的马家沟组,含有上部以Erraticodon tangshanensis为主,下部以Tangshanodus tangshanensis为特征的牙形石。

These cycles plus two first-order cycles in the Phanerozoic successions have disclosed that a genetic link may be postulated for individual Earth shells and galactic precessional cycles.The stratigraphic records of the above-mentioned cycles are significant especially for the division of the Precambrian strata with lower stratigraphic resolutions.

尽管对地层记录中隶属不同级别沉积层序的间断面所代表的间断时限的绝对年限还难以精确估价,而建立在岩相及相序基础之上的旋回性地层记录的研究,是从复杂而不完整的地层记录中寻找出更多规律性的有效途径,特别是对生物地层分辨率不高的前寒武纪地层,尤其显得更加重要。

Divided by mudstones of the middle and lower parts in the Sha-3 Member, two superimposed fault systems are formed in the Cenozoic strata in the western sag, including long-term active faults, presenile active faults and late-developed active faults, which, in origin, are extensional normal fault, strike-slip fault, strike-slip normal fault, strike-slip reverse fault.

结果表明:以沙三段中下部大套泥岩为界,西部凹陷形成了上下叠加的2个断裂系统,主要发育长寿型、早衰型和后生型3种类型断层和张性正断层、走滑断层、走滑正断层和走滑逆断层4类不同性质断层。

Through investigation and analyses of sedimentary settings especially the provenience of sediments, the Sinian-Jurassic sedimentary strata exposed in the study area have been recognized as Sinian-Lower Triassic passive continental marginal sequences and the Middle Triassic-Middle Jurassic foreland basin sequences. And then, it is inferred that the collisional orogeny in the Dabieshan orogen took place in the Middle Triassic.

通过对那里沉积物形成环境,特别是物源区的分析研究,识别出震旦系至下三叠统被动陆缘沉积岩系和中三叠统至中侏罗统前陆盆地沉积岩系,据此推测大别造山带碰撞造山作用发生在中三叠世。

Results demonstrate that climate fluctuations recorded by the two boreholes correspond to the marine oxygen isotope stages. Thick layer of coarser grained fluvial deposits and the third layer of "hard mud" were deposited in the study area during MIS 6, reflecting a cold climate. The sediments became fine-grained and indicate a coastal marsh depositional environment during MIS 5. The second layer of "hard mud" was deposited during MIS 4. Fine-grained coastal marsh deposits dominated in the study area during early MIS 3, while lagoon-beach ridges prevailed during middle and late MIS 3, forming a layer of silt and fine sand in the coastal plain. The MIS 2 strata are composed of a typical sedimentary sequence with coarse grain in the lower section and fine grain in the upper section, i. e. yellowish grey or brownish yellow silt and brownish yellow or dark green "hard mud", respectively.

研究结果显示,两孔记录的古气候波动可与深海氧同位素曲线进行对比:对应于深海氧同位素曲线第6阶段(MIS6),堆积厚层的河道相粗颗粒沉积及第3硬土层,反映当时气候寒冷;第5阶段(MIS5),为滨海湖沼沉积,沉积物的颗粒显著变细;第4阶段(MIS4),本区形成第2硬土层;第3阶段(MIS3)的早期,本区也发育滨海湖沼沉积,中晚期则形成潟湖—砂坝体系,在滨海平原区普遍发育粉、细砂层;第2阶段(MIS2),地层由下粗上细的沉积序列构成,下部为黄灰、棕黄色粉砂,上部则为棕黄色或暗绿色硬粘土。

The authors have proposed a new classification scheme for the division and correlation of the stratigraphic systems on the basis of lithology and vertical fossil distribution in the Silurian and Lower Devonian strata in the study area.

笔者详细记述了稗子田志留系至下泥盆统下部剖面的岩性特征和生物化石的垂直分布状况,在此基础上建立和完善区内新的地层系统,提出地层划分的对比依据和建议。

Fluorine content is mostly more than 800mg/kg in carbonaceous slate, black shale and phosphorite of Lower Cambrian, and is also high in carbonaceous slate of Lower Silurian (more than 1500mg/kg), which strata are the fluorine-rich zones in Daba Area.

这对研究我国山区和风化剥蚀地区氟的空间分布规律和地域差异及其与人类健康的关系,具有重要的理论和现实意义。

Mainly occurs in the middle and lower Triassic strata, in order to sedimentary deposits.

主要赋存于中下三叠统地层中,为沉积型矿床。

These mainly are Pteridophyta and Gymnospermae and plant species are frequent ones in lower and middle Jurassic, basically in corresponding to Coniopteris-Phoenicopsis flora group of Lower-Middle Jurassic coal-bearing strata widely distributed in China.

植物化石中以蕨类和裸子类为主,植物总体种群为中外早中侏罗世地层中常见分子,基本上相当于我国早中侏罗世广泛分布的含煤地层所含Coniopteris-Phoenicopsis植物群。

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每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。

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