| Largest Ediacaran discs from the Jodhpur Sandstone,Marwar Supergroup,India: Their palaeobiological signi?cance |
| |
| 基金项目： | Acknowledgements The author is thankful to the Head, Centre of Advanced Study in Geology, Lucknow University, India, for providing basic facilities to carry out this research. She is indebted to Dr. R. Bali for his help during the course of investigation. Financial assistance from DST, New Delhi in form of a WOS-A project No. SR/OY/WOS-A/ES-20/2008 is thankfully acknowledged. |
| |
| 摘 要： | Ediacaran discs from the Jodhpur Sandstone of the Marwar Supergroup, Rajasthan, exhibit a wide size ranging from a few millimetres to 75 cm in diameter. Exceptionally large size of the discs in these rocks represent the largest reported so far from any Ediacaran assemblage. Although, larger medu-soid discs have been reported from USA, they are from the middle Cambrian and even younger rocks. Presence of microbial mats and weed-like structures with well preserved hold fasts and horizontal rhizome-like structures in association with some of these large-sized discs support their animal affinity, which probably feed on this weed-like vegetations. This association also supports their benthic habitat. Unlike the general trend of sudden increase in size of organisms in Ediacaran period and further decrease in size during Cambrian, these discs continued increasing in size in Cambrian also.
|
| 关 键 词： | 光盘 迪卡 砂岩 超群 印度 中寒武世 大尺寸 微生物 |
| 收稿时间： | 15 September 2012 |
http://www.sciencedirect.com/science/article/pii/S1674987113000583 |
| |
| Authors: | Purnima Srivastava |
| |
| Institution: | Centre of Advanced Study in Geology, Lucknow University, Lucknow, Uttar Pradesh 226020, India |
| |
| Abstract: | Ediacaran discs from the Jodhpur Sandstone of the Marwar Supergroup, Rajasthan, exhibit a wide size ranging from a few millimetres to 75 cm in diameter. Exceptionally large size of the discs in these rocks represent the largest reported so far from any Ediacaran assemblage. Although, larger medusoid discs have been reported from USA, they are from the middle Cambrian and even younger rocks. Presence of microbial mats and weed-like structures with well preserved hold fasts and horizontal rhizome-like structures in association with some of these large-sized discs support their animal affinity, which probably feed on this weed-like vegetations. This association also supports their benthic habitat. Unlike the general trend of sudden increase in size of organisms in Ediacaran period and further decrease in size during Cambrian, these discs continued increasing in size in Cambrian also. |
| |
| Keywords: | Ediacaran discs Jodhpur Sandstone Marwar Supergroup Rajasthan India |
| 本文献已被 CNKI 维普 ScienceDirect 等数据库收录！ |
| 点击此处可从《地学前缘(英文版)》浏览原始摘要信息 |
| 点击此处可从《地学前缘(英文版)》下载免费的PDF全文 |
