论文部分内容阅读
系统描述了最近采集的穆棱组植物化石 2 2属 2 3种 ,其中的两种被子植物叶化石均为具原始被子植物叶特征的小型叶 ,在该植物群中尚属首次发现。运用扫描电镜 (SEM)等方法对其中的Tyrmiasp .,Nilssoniopterissp .,Ginkgoitescf.sibirica ,Sphenobaierasp .,Elatocladusmanchurica等化石的叶角质层进行了研究。据已有的资料统计 ,穆棱组迄今已知有化石植物 31属 38种。该植物群以真蕨类占据绝对优势 ,裸子植物也相当丰富 ,其中的大多数种类主要见于早白垩世 ,穆棱组的地质时代应属早白垩世巴列姆期或巴列姆—阿普梯早期。植物组合中以丰富的热带及亚热带型植物为主要特点 ,未发现针叶类型的植物 ,说明早白垩世穆棱组沉积时 ,该地区的气候温暖湿润 ;另一方面 ,落叶的银杏类和松柏类 ,以及裸子植物木化石中具有清楚的生长轮 ,又说明该地区的古气候存在着季节变化。该植物群属于早白垩世西伯利亚植物区或加拿大 西伯利亚植物区
This article describes the recent collection of 23 species of Muling genus fossils, including 22 genera and 2 of them, all of which are small-sized leaves with the original leaf features of angiosperms and are the first to be found in this flora. The stratum corneum of fossils such as Tyrmiasp., Nilssoniopterissp., Ginkgoitescf. Sibirica, Sphenobaierasp., Elatocladusmanchurica and other fossils were studied by scanning electron microscopy (SEM) and other methods. According to the existing statistics, there are 38 species of 31 genera of fossil plants so far known in the Muling Formation. The flora is dominated by true ferns, gymnosperms are also abundant, most of which are found in the Early Cretaceous. The Muling Formation geologic age should belong to the Early Cretaceous Balmain period or Balmain - AP Ladder early. The plant assemblages are characterized by rich tropical and subtropical plants and no coniferous plants, indicating that the climate of the Muling Formation during the Early Cretaceous was warm and humid. On the other hand, deciduous ginkgo and cypresses And clear growth rings in the gymnosperm fossils of gymnosperms, as well as the seasonal changes in paleoclimate in the area. The flora belongs to the Early Cretaceous Siberian flora or Siberia, Canada