Navigation Links
Oldest fossils of large seaweeds, worm-like animals tell story of ancient oxygen
Date:2/23/2011

hortly after the largest ice age ever, says Xiao, when much of the global ocean was frozen.

By 635 million years ago, the snowball Earth event ended and the oceans were clear of ice. Perhaps, Xiao says, "that prepared the ground for the evolution of complex eukaryotes."

The team examined the black shale rocks because, although they were laid down in less than optimal waters for oxygen-dependent organisms, "they are known to be able to preserve fossils very well," says Shuhai.

"In most cases, dead organisms were washed in and preserved in black shales. In this case, we discovered fossils that were preserved in pristine condition--some seaweeds still rooted--where they had lived."

The conclusion that the environment would have been poisonous is derived from geochemical data, "but the bedding surfaces where these fossils were found represent moments of geologic time during which oxygen was available and conditions were favorable," says Xiao.

"They are very brief moments to a geologist, but long enough for the oxygen-demanding organisms to colonize the Lantian basin and capture the rare opportunities."

The research team suggests that the Lantian basin was largely without oxygen, but was punctuated by brief oxic episodes that were populated by complex new life forms.

Those life forms were subsequently killed and preserved when the oxygen disappeared.

"Such brief intervals need high-resolution sampling for geochemical analysis to capture the dynamic and complex nature of oxygen history in the Ediacaran Period," says lead paper author Xunlai Yuan. The Ediacaran Period is the last geological period immediately preceding the Cambrian Period.

Proving that hypothesis awaits further study.

The rocks in the study region are deposited in layered beds. The nature of the rock changes subtly, and there are finer and finer layers that can be recognized within each bed.

"We will need
'/>"/>

Contact: Cheryl Dybas
cdybas@nsf.gov
703-292-7734
National Science Foundation
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Researchers uncover worlds oldest fossil impression of a flying insect
2. 4,000-year-old coral beds among worlds oldest living things, prof says
3. Kent State University Professor C. Owen Lovejoy helps unveil oldest hominid skeleton
4. Ardi displaces Lucy as oldest hominid skeleton
5. Dinosaur-chewing mammals leave behind oldest known tooth marks
6. Oldest Earth mantle reservoir discovered
7. Scientists discover oldest evidence of human stone tool use and meat-eating
8. UNH researcher helps identify key reproductive hormone in oldest vertebrate
9. Oldest evidence of dinosaurs found in Polish footprints
10. VTT to study one of worlds oldest beers
11. Oldest species of a marine mollusc discovered
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Oldest fossils of large seaweeds, worm-like animals tell story of ancient oxygen
(Date:7/31/2015)... Die 10. internationale Konferenz zu Genomik (ICG-10, ... vom 22. bis 25. Oktober 2015 in ... Die Konferenz feiert in diesem Jahr ihr ... ICG weltweit zu einem der einflussreichsten jährlichen Treffen ... dynamischsten, enthusiastischsten und angenehmsten wissenschaftlichen Zusammentreffen. ...
(Date:7/31/2015)... China , July 31, 2015 The 10 ... will be held by BGI from October 22-25, 2015, in ... The conference is celebrating its 10 th anniversary ... one of the world,s most influential annual meetings in the ... and enjoyable scientific gatherings. ICG-10 focuses on ...
(Date:7/27/2015)... SAN JOSE, Calif. , July 27, 2015 ... leading developer of human interface solutions, today announced ... ClearPad ® touchscreen solution for its stylish ... controller for its proven reliability, low power and ... with a wet finger. Huawei designers also required ...
Breaking Biology News(10 mins):Die 10. internationale Konferenz zu Genomik (ICG-10) beginnt im Oktober 2Die 10. internationale Konferenz zu Genomik (ICG-10) beginnt im Oktober 3The 10th International Conference on Genomics (ICG-10) to Open in October 2Synaptics Touchscreen Solution Powers New Huawei Watch 2Synaptics Touchscreen Solution Powers New Huawei Watch 3
... At some point this year, after NASA,s rover Curiosity has ... infrared light at a rock or soil sample. This will ... a plume of ionized gas or plasma, which will be ... Mars rovers, however, will be able to do even more. ...
... 1, 2012 Probing the largely unexplored question of ... have discovered that by mimicking nature, a robotic fish ... Through a series of experiments, researchers from Polytechnic Institute ... of collective animal behavior, including learning how robots might ...
... Philadelphia, PA, March 1, 2012 Down syndrome (DS) ... children arising as a consequence of a chromosomal abnormality. ... of chromosome 21, instead of the usual two. It ... dysfunction that can range from mild to severe but ...
Cached Biology News:LAMIS -- a green chemistry alternative for laser spectroscopy 2LAMIS -- a green chemistry alternative for laser spectroscopy 3LAMIS -- a green chemistry alternative for laser spectroscopy 4What makes a robot fish attractive? (Hint: It's in the moves) 2Understanding and treating the cognitive dysfunction of Down syndrome and Alzheimer's disease 2
(Date:7/30/2015)... July 30, 2015  With over 60,000 customers across the globe, ISN improves the ... hiring organizations with more than 60,000 safe and reliable contractors in over 80 countries. ... ... Over 60,000 ... Headquartered in Dallas, TX , ...
(Date:7/30/2015)... ... July 30, 2015 , ... As part of its 2015 growth plan and as a follow ... service business units, Whitehouse Laboratories is pleased to announce that it has begun construction ... Center of Excellence and will be strictly dedicated to basic USP 51, USP 61, and ...
(Date:7/29/2015)... , July 30, 2015 According ... Market - Growth, Trends & Forecasts (2015-2020), , published by ... US$ 30.25 billion by the end of 2020, with ... accounting for more than 40% of the global market size. ... at a CAGR of 13.7% during the period of (2015-2020). ...
(Date:7/29/2015)...  HealthSouth Corporation (NYSE: HLS ), ... healthcare services, offering both facility-based and home-based post-acute ... the second quarter ended June 30, 2015. ... volume growth in both segments and an 11.0% ... President and Chief Executive Officer of HealthSouth. "While ...
Breaking Biology Technology:ISN Reaches Over 60,000 Worldwide Customers 2ISN Reaches Over 60,000 Worldwide Customers 3Whitehouse Labs Formally Announces Plans to Open a Microbiological Laboratory 2Asia Pacific to Dominate the Global Stem Cell Market - Vericel Corporation, Ocata Therpeutics, Athersys Inc., Cryo-Cell International, Geron Corporation, StemCells, Inc. Among the Major Players 2Asia Pacific to Dominate the Global Stem Cell Market - Vericel Corporation, Ocata Therpeutics, Athersys Inc., Cryo-Cell International, Geron Corporation, StemCells, Inc. Among the Major Players 3HealthSouth Reports Results for Second Quarter 2015 2HealthSouth Reports Results for Second Quarter 2015 3HealthSouth Reports Results for Second Quarter 2015 4HealthSouth Reports Results for Second Quarter 2015 5HealthSouth Reports Results for Second Quarter 2015 6HealthSouth Reports Results for Second Quarter 2015 7HealthSouth Reports Results for Second Quarter 2015 8HealthSouth Reports Results for Second Quarter 2015 9HealthSouth Reports Results for Second Quarter 2015 10HealthSouth Reports Results for Second Quarter 2015 11HealthSouth Reports Results for Second Quarter 2015 12HealthSouth Reports Results for Second Quarter 2015 13HealthSouth Reports Results for Second Quarter 2015 14HealthSouth Reports Results for Second Quarter 2015 15HealthSouth Reports Results for Second Quarter 2015 16HealthSouth Reports Results for Second Quarter 2015 17HealthSouth Reports Results for Second Quarter 2015 18HealthSouth Reports Results for Second Quarter 2015 19HealthSouth Reports Results for Second Quarter 2015 20HealthSouth Reports Results for Second Quarter 2015 21HealthSouth Reports Results for Second Quarter 2015 22HealthSouth Reports Results for Second Quarter 2015 23HealthSouth Reports Results for Second Quarter 2015 24HealthSouth Reports Results for Second Quarter 2015 25HealthSouth Reports Results for Second Quarter 2015 26HealthSouth Reports Results for Second Quarter 2015 27HealthSouth Reports Results for Second Quarter 2015 28HealthSouth Reports Results for Second Quarter 2015 29HealthSouth Reports Results for Second Quarter 2015 30HealthSouth Reports Results for Second Quarter 2015 31
... 10, 2010 Ramius V&O Acquisition LLC, a subsidiary ... has sent a letter to the Board of Directors ... outlining its willingness to acquire all of Cypress, outstanding ... share.  The offer is conditioned upon Cypress commencing exclusive ...
... 10, 2010 Pfizer Inc. (NYSE: PFE ... safety, it is voluntarily withdrawing Thelin® (sitaxentan) for the ... it is approved (the European Union, Canada and Australia). ... worldwide. (Logo: http://photos.prnewswire.com/prnh/20100416/PFIZERLOGO) Pfizer,s ...
... will help UK athletes reach the top of their ... the UK,s high performance sports agency, has reached an ... edge technology developed by Argento Diagnostics to improve training ... to monitor various proteins which reveal details about the ...
Cached Biology Technology:Ramius Offers to Enter Into Immediate and Exclusive Negotiations to Acquire Cypress Bioscience for $5.50 Per Share 2Ramius Offers to Enter Into Immediate and Exclusive Negotiations to Acquire Cypress Bioscience for $5.50 Per Share 3Ramius Offers to Enter Into Immediate and Exclusive Negotiations to Acquire Cypress Bioscience for $5.50 Per Share 4Ramius Offers to Enter Into Immediate and Exclusive Negotiations to Acquire Cypress Bioscience for $5.50 Per Share 5Ramius Offers to Enter Into Immediate and Exclusive Negotiations to Acquire Cypress Bioscience for $5.50 Per Share 6Pfizer Stops Clinical Trials of Thelin® and Initiates Voluntary Product Withdrawal in the Interest of Patient Safety 2Pfizer Stops Clinical Trials of Thelin® and Initiates Voluntary Product Withdrawal in the Interest of Patient Safety 3Medical science helps UK athletes reach peak performance 2Medical science helps UK athletes reach peak performance 3
... Monitoring Kit measures adenosine triphosphate ... and a dynamic range. Based ... assay measures ATP in bacterial, ... a concentration range of 10-11 ...
... series of refrigerated cold traps offers a ... low volatility/aqueous solvents or high volatility solvents. ... vacuum concentrators/centrifugal evaporators. Also used for maintaining ... as used in electron microscopes. Can be ...
... Trap is specifically designed for efficient ... as DMSO and DMF in the ... refrigeration system set at -5 o ... DMSO, while completely eliminating the risk ...
Black 96 Well Plate EB, RE Bottom...
Biology Products: