| 词条 | Bitter Springs type preservation |
| 释义 |
The Bitter Springs preservational mode is the preservation of microorganisms in silica, in shallow Precambrian waters.[1] Taphonomic processesSilica is emplaced around the organisms very rapidly, before their cells can even collapse; the strong silica is able to withstand great pressures and preserves three-dimensional detail even after metamorphosis.[1] Microbial mats, as they decayed, acted as nuclei for silica precipitation.[1] OccurrenceThe preservational mode is only present in the Precambrian, and is restricted to shallow or tidal waters.[1] After this point, organisms such as sponges extracted silica from the oceans in order to construct tests (skeletons), with the result that the surface oceans no longer became supersaturated with respect to silica when evaporation condensed the mineral.[1] ConstraintsBecause microbial mats and shallow, supersaturated seas were necessary for the formation of this form of deposit, larger eukaryotic organisms could not survive in the regions in which these deposits were formed; hence the record is mainly restricted to bacteria.[1] References1. ^1 2 3 4 5 {{cite journal | title = Exceptional Fossil Preservation and the Cambrian Explosion | year = 2003 | journal = Integrative and Comparative Biology | volume = 43 | issue = 1 | pages = 166–177 | doi = 10.1093/icb/43.1.166 | author = Butterfield, Nicholas J. | pmid=21680421}} {{Cambrian preservational modes}}{{DEFAULTSORT:Bitter Springs Type Preservation}}{{paleo-stub}} 2 : Fossilization|Proterozoic fossil record |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。