Lineages in early paleogene calcareous nannoplankton
Lineages in early paleogene calcareous nannoplankton
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早古近纪钙质超微浮游生物的谱系
DOI：
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发表时间：
1979
期刊：
影响因子：
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通讯作者：
A. Romein
中科院分区：
文献类型：
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作者：
A. Romein
古新世-中始新世钙质砂岩超微结构的详细研究
超微化石使人们认识到进化谱系包括
16属110种。血统是建立在
根据来自西班牙近距离采样的植物区系证据，
以色列、丹麦和瑞典。
关于物种超微结构的信息，以及它们之间的关系。
种，通过在扫描电子显微镜中对所选标本进行调查而获得
显微镜，并通过研究别人与偏光显微镜
配备有石膏板。后一种显微镜显示了灭绝-
和标本的颜色模式。原则和适用性
对后一种技术进行了讨论。
有人认为，有关钙质微型浮游生物进化的陈述
由于化石材料的性质，
研究方法。
重点研究了白垩纪/第三纪界线段的植物群。
在本文中，它是建议定义的下边界的
Braarudosphaera大量出现的第三纪最低超微化石带
bigelowii和/或Thoracosphaera operculata。一些可能的
除此之外，试图发现第三纪生物群的白垩纪祖先的努力，
毫无结果
生物地层划分采用第三系标准分带
研究序列的细分。建立的血统增加到
这种分带的细化，因为大多数的分区标记属于
血统
额外的，在某些情况下，新的信息是关于超微结构
和光学行为。几个新的描述
引入术语并进行一些新的组合。九
描述了新种：Biscutum parvulum，Braarudosphaera阿尔塔，Cruciplacolithus
edwardsii，宽桥十字板蟹，双盖扁蟹，
巨大束壳虫，中间菱壳虫，双裂菱壳虫
和Zygodiscus clausus。
A detailed study of the ultrastructure of Paleocene-Middle Eocene calcareous
nannofossils has led to the recognition of evolutionary lineages comprising
16 genera and 110 species. The lineages have been established on the
basis of evidence from floras derived from closely sampled sections in Spain,
Israel, Denmark and Sweden.
Information about the ultrastructure of species, and the relations between
species, was gained by investigating selected specimens in the Scanning Electron
Microscope, and by studying others with a polarization microscope
equipped with a gypsum plate. The latter microscope showed up the extinction-
and colour patterns of the specimens. The principles and applicability
of the latter technique are discussed.
It is argued that statements about the evolution of calcareous nannoplankton
are necessarily speculative due to the nature of the fossil material and
the method of study.
Attention was given to the floras in the Cretaceous/Tertiary boundary interval.
In this paper it is proposed to define the lower boundary of the
lowest nannofossil zone of the Tertiary by the mass occurrence of Braarudosphaera
bigelowii and/or Thoracosphaera operculata. With a few possible
exceptions, efforts to detect the Cretaceous ancestors of Tertiary taxa were
fruitless.
The Standard Zonation for the Tertiary was applied for the biostratigraphic
subdivision of the investigated sequences. The established lineages added to
the refinement of this zonation, as most of the zonal markers belong to the
lineages.
Additional and, in some cases, new information is given about the ultrastructure
and optical behaviour of all taxa encountered. Several new descriptive
terms are introduced and some new combinations are made. Nine
new species are described: Biscutum parvulum, Braarudosphaera alta, Cruciplacolithus
edwardsii, Cruciplacolithus latipons, Fasciculithus bitectus,
Fasciculithus magnicordis, Rhomboaster intermedia, Rhomboaster bitrifida
and Zygodiscus clausus.