南秦岭西乡—石泉地区三花石群白勉峡组中泥盆世孢子化石的发现及其地层意义

Discovery of the Middle Devonian spores from Baimianxia Formation of Sanhuashi Group, Xixiang-Shiwquan region，South Qinling, China and its geological significance. Geological Bulletin of China

摘要: 陕西汉南三花石群和西乡群的时代仍存很大争议。在陕西西乡地区三花石群白勉峡组灰色、灰黑色砂板岩中发现较丰富并具有时代特征的陆生植物孢子（spores）22属，40余种。其化石组合大致可与中国华南、西南和西秦岭中泥盆世孢子带比较，亦可以与欧洲、北美老红砂岩大陆及其邻区中泥盆世早期孢子带比较，时代为中泥盆世，并可能为中泥盆世早期，大致相当于西欧中泥盆世早期艾菲尔期。

Abstract: Discrepancy remains on the age of the Sanhuashi Group and Xixiang Group, Hannan, Shanxin Province. Abundant continental spores which can be categorized into 40 varieties, 22 genera with indicative timing feature were discovered in grey and black grey sandy plate rocks of Baimianxia Formation. This fossil assemblage with the most possible age of Middle Devonian or early Middle Devonian can be roughly correlated with those Devonian spores in South China, Southwest China and West Qingling, or furthermore with early Middle Devonian spores from European and South America ancient red sandstone and its vicinities, to be more exact, early Eifelian of Middle Devonian in West Europe.