The fossil alga Chaetocladus gracilis revisited: new material from the Silurian of Sweden

IF 1.2 4区地球科学 Q2 GEOLOGY

Gff Pub Date : 2020-09-22 DOI:10.1080/11035897.2020.1819408

J. Pettersson, P. Ahlberg, Anders Lindskog, J. Lindgren, M. Eriksson

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引用次数: 1

Abstract

ABSTRACT In 2006, a new species of non-calcified dasycladalean alga, Chaetocladus gracilis, from the upper Silurian of Skåne (Scania), southernmost Sweden, was erected. The original description was based on a single incomplete fossil recovered from the abandoned limestone quarry at Bjärsjölagård, a classic geologic locality in Scania. Here we present four additional and, importantly, more complete specimens from this same site and type stratum. This new material largely corroborates the general anatomical features of C. gracilis, but also adds some intricate details, most notably with regards to the external sheet-like phytoleim and organisation of the laterals. Elemental mapping confirmed an expected carbonaceous composition of the fossils, which are embedded in a calcareous mudstone. These additional fossils show that the originally described specimen was not a singular occurrence at this locality. Based on the state of preservation of our algal fossils, we note that the mudstone facies of the Ludlow Bjärsjölagård Limestone Member of the Klinta Formation (Öved-Ramsåsa Group), from which all C. gracilis have been recovered, share characteristics with deposits typically referred to as “algal-Lagerstätten”.

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重访细毛壳藻化石：来自瑞典志留纪的新材料

摘要2006年，瑞典最南端斯堪的纳维亚志留纪上统的一种新的无钙化大环藻——细毛壳藻（Chaetocladus gracilis）被发现。最初的描述是基于从斯堪尼亚的经典地质地区Bjärsjölagård废弃的石灰岩采石场中发现的一块不完整的化石。在这里，我们展示了来自同一地点和类型地层的四个额外的，更重要的是，更完整的标本。这一新材料在很大程度上证实了薄叶C.gracilis的一般解剖特征，但也增加了一些复杂的细节，最显著的是关于外部片状植物群落和侧枝的组织。元素测绘证实了化石的碳质成分，这些化石嵌入钙质泥岩中。这些额外的化石表明，最初描述的标本并不是这个地方的单一化石。根据我们藻类化石的保存状态，我们注意到，Klita组Ludlow Bjärsjölagård石灰岩段（Öved Ramsåsa群）的泥岩相与通常被称为“藻类Lagerstätten”的矿床具有相同的特征，所有薄C.gracilis都已从该段中回收。

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来源期刊

Gff 地学-地质学

CiteScore

2.80

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： GFF is the journal of the Geological Society of Sweden. It is an international scientific journal that publishes papers in English covering the whole field of geology and palaeontology, i.e. petrology, mineralogy, stratigraphy, systematic palaeontology, palaeogeography, historical geology and Quaternary geology. Systematic descriptions of fossils, minerals and rocks are an important part of GFF''s publishing record. Papers on regional or local geology should deal with Balto-Scandian or Northern European geology, or with geologically related areas. Papers on geophysics, geochemistry, biogeochemistry, climatology and hydrology should have a geological context. Descriptions of new methods (analytical, instrumental or numerical), should be relevant to the broad scope of the journal. Review articles are welcome, and may be solicited occasionally. Thematic issues are also possible.