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:9/16/2014)... has its own bacterial identity. That,s the conclusion of ... who studied the genetic fingerprints of bacteria on 57 ... "This study demonstrates for the first time that host ... strategies possess very different microbial communities on their leaves," ... researcher in the UO,s Institute of Ecology and Evolution ...
(Date:9/16/2014)... new school year, a new football season and another ... September, SpaceX,s Dragon spacecraft is scheduled to blast off ... part of the company,s fourth contracted mission to the ... third suite of research investigations sponsored by the Center ... the role of managing the U.S. National Laboratory on ...
(Date:9/16/2014)... vessel returned to Spain culminating the around the world ... picture of how the global ocean works and what ... from the atmosphere is not limited to coastal areas, ... the planet, and it is already affecting the ocean ... in CSIC Residence for Researchers in Barcelona, in a ...
Breaking Biology News(10 mins):Microbiome research shows each tree species has a unique bacterial identity 2CASIS research set for launch aboard SpaceX mission to space station 2CASIS research set for launch aboard SpaceX mission to space station 3The Malaspina Expedition confirms that pollution reaches even the most remote areas of the ocean 2The Malaspina Expedition confirms that pollution reaches even the most remote areas of the ocean 3
... Columbia University Medical,Center have discovered a way to overcome ... its tendency to kill normal cells in the,process of ... Jan. 25 issue of the Proceedings of the,National Academy ... by incorporating it into a specially designed,virus. The virus ...
... unlock the secret to quicker, more effective treatment of TB ... bacteria are active again, the disease becomes treatable using common ... of this protein will lead the way to designing drugs ... In England and Wales around 400 people die each year ...
... been trying to establish the cause of a repulsive ... DNA and other biomolecules, when they are very close ... know as hydration force. , Jordi Faraudo, a researcher ... de Barcelona, and Fernando Bresme of the Department of ...
Cached Biology News:Columbia research lifts major hurdle to gene therapy for cancer 2UAB scientists discover the origin of a mysterious physical force 2
(Date:9/16/2014)... Sydney, Australia (PRWEB) September 16, 2014 RENU ... Redox Signaling molecules, became available for purchase in Australia ... hosting a nationwide tour beginning September 16th. The tour will ... on the 17th, Bundaberg on the 18th, Sydney on the ... the market in Australia and New Zealand and to educate ...
(Date:9/15/2014)... GREENBELT, Md. , Sept. 15, 2014 /PRNewswire/ ... a leading innovator of scientific products and services ... government-wide One Acquisition Solution for Integrated Services (OASIS) ... Service (FAS). GST was selected to provide the ... in the Small Business (SB) category in Pool ...
(Date:9/15/2014)... EnGeneIC, Ltd. , an emerging ... cancer through the targeted delivery of therapeutic agents ... the Asbestos Disease Research Institute (ADRI), it has ... (NSW) Premier,s Award for Excellence in Translational Cancer ... that will be involved in the clinical trial, ...
(Date:9/15/2014)... State University have developed a technique for controlling the ... voltages, opening the door to a new generation of ... hinges on the fact that the oxide "skin" of ... acts as a surfactant, lowering the surface tension ... researchers used a liquid metal alloy of gallium and ...
Breaking Biology Technology:Global Wellness Company Hosts ASEA Australia Tour September 16-22 2Global Science & Technology, Inc. Awarded GSA OASIS Small Business Contract 2Global Science & Technology, Inc. Awarded GSA OASIS Small Business Contract 3EnGeneIC Named a Recipient of the Cancer Institute NSW Premier's Award for Excellence in Translational Cancer Research 2EnGeneIC Named a Recipient of the Cancer Institute NSW Premier's Award for Excellence in Translational Cancer Research 3Researchers control surface tension to manipulate liquid metals 2
... efficient: BASF research scientists are helping to revolutionize ... aid of three-dimensional photonic crystals. In a three-year ... these crystals together with partners such as Hanover ... the Technical University of Denmark and the Ecole ...
... Sangamo,BioSciences, Inc. (Nasdaq: SGMO ) announced today that ... on the progress of,Sangamo,s ZFP Therapeutic development programs and ... (ET) on Wednesday, November 28,2007 at the Piper Jaffray ... The presentation will be webcast live and may be ...
... Nov. 20 China Biopharma,Inc. (OTC Bulletin Board: ... take closer control and to better improve its ... away from the increasingly competitive and,low margin vaccine ... "We plan to take more control on the ...
Cached Biology Technology:3-D photonic crystals will revolutionize telecommunications 23-D photonic crystals will revolutionize telecommunications 3Sangamo BioSciences to Present at the Piper Jaffray Health Care Conference 2China Biopharma, Inc. Announces New Plan of Operation 2
... CrysScreen is a software package ... user interface for custom buffer creation, ... management in crystallization trials. The software ... steps in automated protein crystallography: ...
BD Falcon insert HTS 96 well, square A-bottom with lid. PET membrane, sterile. (5/ca) Packaging: 5 / pack, 5 / case ...
... 96-well semi-skirted PCR plate, Directly compatible with ... Flat deck for improved sealing characteristics ... seals, mats or cap strips, Certified free ... We are part of Thermo Fisher Scientific, ...
Vented Caps for 75 cm2 Flasks...
Biology Products: