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首页> 外文期刊>Earth and environmental science transactions of the Royal Society of Edinburgh >Revisiting the spore assemblages from the Lower Devonian Posongchong Formation of Wenshan, Yunnan Province, southwestern China
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Revisiting the spore assemblages from the Lower Devonian Posongchong Formation of Wenshan, Yunnan Province, southwestern China

机译：重新审视云南省云南省云南省云南省的秋德农群孢子组合，中国西南部

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The Lower Devonian Posongchong Formation (Wenshan, Yunnan Province, southwestern China) consists of a series of continental deposits with an outstanding plant megafossil diversity. More than 20 years ago, this formation was interpreted as 'Siegenian' (similar to Pragian) in age based on palynology. However, such interpretation needs further evidence because of the known differences between the dispersed spore assemblages from South China and Euramerica/northwestern Gondwana. Here, we present new dispersed spore assemblages recently recovered from the Posongchong Formation. The isolated spore diversity is highly diverse, with 18 genera and 32 species. The recognised taxa include, among others, Ambitisporites avitus, Aneurospora conica, Aneurospora posongchongensis sp. nov., Aneurospora xujiachongensis, Apiculiretusispora plicata, Archaeozonotriletes chulus, Concentricosisporites agradabilis, Dibolisporites echinaceus, Emphanisporites rotatus, Gneudnaspora divellomedia, Latosporites ovalis, Retusotriletes triangulatus, Tetrahedraletes medinensis and Verrucosporites polygonalis, with Aneurospora and Retusotriletes being the most abundant forms. The known Posongchong palynoflora (previous spore data included) suggests that the Posongchong Formation assemblages can be correlated with the Pragian interval of the polygonalis-wetteldorfensis Oppel Zone (PoW). This age determination is supported by the presence of index species of PoW, such as Verrucosporites polygonalis, Dictyotriletes subgranifer and Camarozonotriletes parvus (sensu Steemans, 1989), the latter being known only from the Pragian of Belgium and Germany. Recent advances in the study of the marine faunas in the overlying sequences also indicate a Pragian age for the Posongchong Formation. This new investigation of the Posongchong palynoflora highlights differences of abundance at species level between the Gondwanan-Laurussian floras during the Early Devonian.
机译：较低的德文郡Posongchong组（云南省，云南省，中国西南部）包括一系列欧式存款，植物巨大的巨大巨大的多样性。超过20年前，这种形成被解释为基于宫内学的年龄的“Siegenian”（类似于帕拉克）。然而，这种解释需要进一步的证据，因为Southsed Spore组合之间的已知差异来自华南和欧美人/西北峡谷。在这里，我们展示了最近从Posongchong形成回收的新分散孢子组合。孤立的孢子多样性高度多样化，18个属和32种。公认的分类群包括除，其中Ambitisperites Avitus，Aneurospora Conica，Aneurospora posongchongensis sp。十一月，Aneurospora xujiachongensis，Apiculiretusispora冠蚌，Archaeozonotriletes chulus，Concentricosisporites agradabilis，Dibolisporites echinaceus，Emphanisporites rotatus，Gneudnaspora divellomedia，Latosporites卵圆，Retusotriletes triangulatus，Tetrahedraletes medinensis和Verrucosporites polygonalis，与Aneurospora和Retusotriletes是最丰富的形式。已知的posongchong palynoflora（包括先前的孢子数据）表明，Posongchong形成组合可以与Polygonalis-Wetteldorfensis Oppel区（POW）的邦居区间相关。该年龄测定得到了威尔科的指数物种的存在，例如疣戈斯科斯多头翁，Dictyotriletes亚比里和Camarozonotriletes帕弗（Sensu Stevans，1989），所以只能从比利时和德国的邦里安人知。覆盖序列中海洋动物的研究近期进展也表明了POSONGCHONG形成的邦庄园年龄。这种对Posongchong Palynoflora的新调查突出了在早期德文郡在Gondwanan-Laurussian植物区之间种类水平丰富的差异。

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