- 更多网络例句与菊石壳相关的网络例句 [注：此内容来源于网络，仅供参考]
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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。
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There are plant stems in the middle of the concretions. The contents of fossils such as crinoids, bivalves, ammonoids and conodonts in the concretions are notably higher than those in rocks around the concretions. Many fossils are directly attached to the plant stems.
这些结核中部都有植物茎干，结核内的海百合、双壳、菊石、牙形刺等生物化石含量明显高于结核周围的岩石，且有许多生物化石直接附着在植物茎干上。
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Crinoids, ammonoids and bivalves dwelt on the stems and lived on pseudoplanktons. They were gradually deposited on the sea bottom with increasing biomass of the dwelling organisms and lime content, and at last concretions were formed.
海百合、双壳类和菊石类栖息在植物茎干上营假浮游生活，随着栖息生物量和化学沉积物灰泥的增加，逐渐沉积在海底形成结核。
- 更多网络解释与菊石壳相关的网络解释 [注：此内容来源于网络，仅供参考]
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ammonites：菊石类(头足类,T-J)
"ammonite","鲕状岩" | "ammonites","菊石类(头足类,T-J)" | "ammoniticone","菊石壳"
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ammoniticone：菊石壳
菊石 Ammonites | 菊石壳 ammoniticone | 菊石亚纲 Ammonoidea
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Baculites：杆菊石
有的体型巨大. 下面就来瞧瞧这些长相古怪的史前深海动物吧! 杆菊石(Baculites) 这种白垩纪晚期的属只有壳上最最早期的部分保持盘卷,以后长出的部分成为笔直的杆. 杆菊石在一处地方会大量存在,常常没有其它种的存在,它能够长至1米.
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Hoplites：盔菊石
白垩纪是菊石群,除去正常具平缓旋螺形球业的刺菊石(ACANTHOCEAS),盔菊石(HOPLITES)外,还产生了一些壳形十分特殊而反常的科、属. 有的壳体变为直柱状,如棒菊石(BACULITES);有的旋圈分离,不相卷合,如公羊齿菊石(CRIOCERATITES);