New Fossil Liverworts from the Lower Cretaceous of Western Liaoning, China

来源 :Acta Geologica Sinica(English Edition) | 被引量 : 0次 | 上传用户:qncy1235i
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Sixteen liverwort specimens collected from the Lower Cretaceous Yixian Formation of Huangbanjigou Village, Liaoning Province, China are studied in this work. The plants are thalloid and preserved in brown arenaceous mudstone as impressions. Based on examinations, the liverworts are assigned to two new genera and five new species: Riccardiothallus palmata sp. nov., Pallaviciniites stricta sp. nov., Pellites latithallus gen. et sp. nov., Conocephalumites hexagonites gen. et sp. nov. and Metzgerites multifidus sp. nov., belonging to five families and five genera. The fossil research indicates that the divergence of families, Aneuraceae and Metzgeriaceae, Pallaviciniaceae and Hymenophytaceae,Pelliaceae and Fossombroniaceae, was in the Lower Cretaceous(125 Ma). The research provides significant additions to the fossil liverwort records in Western Liaoning and offers fossil evidence for studying the classification and evolution of extant liverworts. Sixteen liverwort materials collected from the Lower Cretaceous Yixian Formation of Huangbanjigou Village, Liaoning Province, China are studied in this work. The plants are thalloid and preserved in brown arenaceous mudstone as impressions. Based on examinations, the liverworts are assigned to two new genera and five new species: Riccardiothallus palmata sp. nov., Pallaviciniites stricta sp. nov., Pellites latithallus gen. et sp. nov., Conocephalumites hexagonites gen. et sp. nov. and Metzgerites multifidus sp. nov., belonging to five families and The fossil research indicates that the divergence of families, Aneuraceae and Metzgeriaceae, Pallaviciniaceae and Hymenophytaceae, Pelliaceae and Fossombroniaceae, was in the Lower Cretaceous (125 Ma). The research provides significant additions to the fossil liverwort records in Western Liaoning and offers fossil evidence for studying the classification and evolution of extant liverworts.
其他文献
要想提高初中英语教学的质量,就必须想法设法提高初中英语教学的有效性。为了实现初中英语教学的有效教学,教师可以在课堂导入、教学方法方面加以改进。本文结合本校实际情况,总
With a thick sequence of early Eocene to Pleistocene terrestrial records, the Qaidam Basin on the northern Tibetan Plateau provides an important sedimentary arc
英语课作为一门语言学科,非常注重学生自主学习的发展.因此,如何在初中英语教学的过程中激发学生的主观能动性,提高学生自主学习的能力,也就格外重要.作者根据多年英语教学经
有效课堂教学首先要依赖于教师对教学内容的全面把握,对教材的整体把握是一个教师教学的基点,了解一节课在整个单元中的作用,一个单元的知识在学段中、在整个知识领域中的地位,明
破碎rn我忽然发现那个喇嘛犯了一个错误:他面朝门士村念经的时候,把一个小包放在身边的玛尼石上,他的动作有些笨拙,所以他放包的时候显得有些拖泥带水,一块小玛尼石被他不经
在课堂中学生的灵感和老师能否进行心灵的碰撞,在于教师能否充当好“愤愤悱悱”的角色,而这一角色的奠基是需要扎实的知识功底和不断更新的教育理念。
学习一门语言的关键在于交流和表达,表达又包括口语表达与书面表达,英语作为一门外来语言学生在学习过程中难免会遇到不少问题.写作教学是初中英语教学体系中的重要环节,不过
素质教育是面向全体学生,全面提高学生基本素质,促进受教育者全面、生动、活泼发展的教育。素质教育既体现一种教育思想,也表现为一种实践模式,它具有广泛的思想涵义。语文学科既
高中阶段的学习是很紧张的,很多学生经过高一的学习后并没有找到适合自己实际情况的学习方法,导致英语学习出现了瓶颈阶段.因此,高二是高中承上启下的重要阶段,养成良好学习
The Astara Fault System(AFS) is located in the northwest Alborz, east of Talesh Mountain(TM) and west of the South Caspian Basin(SCB). The AFS is one of the bas