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:9/30/2014)... KONG , Sept. 30, 2014 Winners of ... Economist Events, Innovation Summit scheduled to take place at the JW ... the summit, the award winners will share their experiences and the ... who have made a proven innovation over the past decade, will ... the night before the summit. It will be the first ...
(Date:9/29/2014)... , coupled with a high-fat diet, may cause animals to ... mBio , the online open-access journal of the American Society ... Institute of Human Nutrition Potsdam-Rehbruecke in Nuthetal observed that mice ... weight when fed a high-fat diet. Mice that did not ... consuming a high-fat diet, and mice that had C. ...
(Date:9/29/2014)... confirms that the exposure to tar tended to be ... cigarettes. Similarly, exposure to nicotine tended to be ... of cigarette in several countries around the world. Previous ... chemicals in the smoke of these cigarettes are lower ... of chemicals in the smoke are not necessarily linked ...
Breaking Biology News(10 mins):Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 2Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 3Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 4Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 5Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 6Hear from The Economist's 2014 Innovation Award Winners at Innovation Summit on October 10th in Hong Kong 7Gut bacteria promote obesity in mice 2Slim cigarette smokers not exposed to more harmful chemicals 2
... valves, can drive experimental samples through a lab-on-a-chip in ... This development could significantly simplify the process of conducting ... research will be published online in the Proceedings ... of July 20. A lab-on-a-chip, or microfluidic ...
... Mice with a defective mitochondrial protein called MCLK1 ... should spell disaster, yet according to a study in ... slower rate and live longer than normal mice. ... aging process; over time, reactive oxygen species produced by ...
... Malaria Research Institute have for the first time produced ... quantity to generate a significant immune response in mice ... vaccine. Antibodies induced by Pfs48/45 protein vaccine effectively blocked ... , as it grows within the mosquito. Sexual development ...
Cached Biology News:Music is the engine of new U-M lab-on-a-chip device 2Vaccine blocks malaria transmission in lab experiments 2
(Date:9/30/2014)... iLab Solutions announced the results of its ... on core facility operations, growth and utilization as well ... In its 4th year running, a number of long-term ... decrease in the percentage of revenue that comes from ... constraints of this trend. When asked, “What are your ...
(Date:9/30/2014)... LONDON , Sept. 30, 2014 ... analyze global next-generation (NGS) sequencing trends and use. ... technology use is expected to increase within the ... are the top criteria for purchasing sequencing instruments. ... technologies. The popularity of RNA-Seq continues to surge, ...
(Date:9/30/2014)... (PRWEB) September 30, 2014 The custom ... ISPE Boston Product Show 2014. The Boston Area Chapter ... the 23rd annual, day-long event for Wed., Oct. 1 ... promises to be the largest in ISPE Boston’s long ... upward of 3,000 attendees expected. , HOLLOWAY AMERICA ...
(Date:9/30/2014)... Lyme Research Alliance (LRA), ... research at universities, today announced the awarding of seven ... treatment and cure for Lyme and other tick-borne diseases. ... applications in its history—over 20 grant proposals—a 100 percent ... pleased to receive so many solid applications from talented ...
Breaking Biology Technology:iLab Solutions Announces the Results of the 2014 Core Facility Benchmarking Study 2iLab Solutions Announces the Results of the 2014 Core Facility Benchmarking Study 3Global Next-generation Sequencing Trends 2HOLLOWAY AMERICA to Exhibit at ISPE Boston Product Show 2014 2HOLLOWAY AMERICA to Exhibit at ISPE Boston Product Show 2014 3Lyme Research Alliance Awards Nearly $600,000 in New Grants 2Lyme Research Alliance Awards Nearly $600,000 in New Grants 3Lyme Research Alliance Awards Nearly $600,000 in New Grants 4
... , SOUTH BURLINGTON, Vt ., June 22 As previously ... Property including the patents of the Del-ID system to an Ontario ... is now pleased to announce leadership changes and appointments to QTECH,s Management Team ... of Kitchener, Ontario . , ...
... ... , ... Forza Silicon Corporation announced today that it is in a joint development effort with a ... CMOS image sensors., , , , ,Forza Silicon Corporation Chief Technology Officer, Daniel Van Blerkom, ...
... Researchers at Rensselaer Polytechnic Institute have developed a simple ... nanomaterial graphene. The new technique works at room temperature, ... mass production of graphene. An atom-thick sheet ... unique mechanical and electrical properties and is considered a ...
Cached Biology Technology:delSECUR CORPORATION Announces Organizational Update as QTECH SYSTEMS INC. Expands Leadership Team 2delSECUR CORPORATION Announces Organizational Update as QTECH SYSTEMS INC. Expands Leadership Team 3Forza Silicon Announces High Dynamic Range CMOS Sensor Development 2Researchers at Rensselaer Polytechnic Institute develop new method for mass-producing graphene 2Researchers at Rensselaer Polytechnic Institute develop new method for mass-producing graphene 3
Bethyl Laboratories Ready-To-Use IHC Bluing Reagent is used following IHC hematoxylin counterstaining with immunohistochemical procedures. Shelf-Life: 1 year from date of receipt...
... 3F10B10. Immunogen: Synthetic peptide ... of JAB1 (Jun activation domain-binding ... Specific for the JAB1 protein. ... 293T Jurkat cell lysates). ...
ready-to-use solution...
...
Biology Products: