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首页> 外文期刊>Journal of Systematic Palaeontology >MICROPLANKTON BIOSTRATIGRAPHY OF THE BRINGEWOOD GROUP, LUDLOW SERIES, SILURIAN, OF THE TYPE AREA
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MICROPLANKTON BIOSTRATIGRAPHY OF THE BRINGEWOOD GROUP, LUDLOW SERIES, SILURIAN, OF THE TYPE AREA

机译：白柳木群，LUDLOW系列，志留纪微浮游生物的生物特征

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摘要

The distribution of the acritarchs and prasinophyte algae in the Lower Bringewood Formation and Upper Bringewood Formation, Ludlow Series, Silurian, of the type Ludlow area and nearby Downton area is reported. Ten new taxa, Melikeriopalla fissura, Buedingiisphaeridium crassum, Dateriocradus ludloviensis, Diexallophasis downtongorgensis, Dorsennidium europaeum quintum, Dorsennidium gogginense, Dorsennidium pymmidale, Onondagella deunffii downtonensis, Visby-sphaera lamina and Visbysphaera bringewoodense are described. The new combination Eisenack-idium gordonense (Crame, 1964b) is proposed. In the type Ludlow area there is an increase in the abundance per gram of sample, but a decline in diversity, of the acritarchs and prasinophyte algae across the Lower Bringewood Formation-Upper Bringewood Formation boundary. However, the microplankton show a general trend of decreasing abundance per gram of sample, but increasing diversity, through the Bringewood Group in the Downton area. The fluctuations in the abundance and diversity of the microplankton cannot be used to correlate the Ludlow and Downton areas and this probably reflects differences in their local depositional environments, which affected the rate of sedimentation and/or the living microplankton populations. However, the first occurrences of M. fissura, Leoniella vilis, O. deunffii downtonensis, V. bringewoodense and D. pyramidale and last occurrences of O. deunffii downtonensis and V. lamina do allow correlation of the Ludlow and Downton areas. Furthermore, the base of the Leoniella vilis Biozone is now recognised as correlating approximately with the base of the Upper Bringewood Formation. In the Ludlow area, the L. vilis Biozone first occurs with certainty 3.03 m above the base of the Upper Bringewood Formation and this compares well with the Downton area, where it was recorded 4.5 m above the base of that unit.
机译：据报道，在志留纪的Ludlow系列，Ludlow地区和附近的Downton地区，在下布林伍德组和上布林伍德组，Ludlow系列，志留纪地区，顶基和类藻类藻类的分布。十个新的类群，Melikeriopalla fissura，Buedingiisphaeridium crassum，Dateriocradus ludloviensis，Diexallophasis downtongorgensis，Dorsennidium europaeum quintum，Dorsennidium gogginense，Dorsennidium pymmidale，Onondagella deunffiis downsensetons and Visbyeras提出了新的艾森纳克-艾登哥多尼斯组合（Crame，1964b）。在拉德洛类型地区，横跨下布林伍德组-上布林伍德组边界的原发藻和藻类藻类的丰度每克样品增加，但多样性下降。但是，通过唐顿地区的布林伍德集团，微浮游生物总体趋势是每克样品的丰度降低，但多样性增加。微浮游生物的丰度和多样性的波动不能被用来关联拉德洛和唐顿地区，这可能反映了它们局部沉积环境的差异，这影响了沉积速率和/或微浮游生物的种群。但是，最初发生的裂变支原体，利奥内拉菌，deunffii downtonensis，V。putewoodense和D. pyramidale以及最后出现的o。deunffii downtonensis和V. lamina确实允许Ludlow和Downton地区的相关性。此外，现在已确认莱昂氏菌生物区的底部与上布林伍德地层的底部大致相关。在拉德洛地区，维利斯湖生物区首先确定地出现在上布林伍德地层上方3.03 m处，这与唐顿地区相当，后者在该地区的底部上方4.5 m被记录下来。

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