Featured Research

from universities, journals, and other organizations

Virtual Trip To The Heart Of 400 Million Years Old Microfossils

Date:
July 25, 2005
Source:
European Synchrotron Radiation Facility
Summary:
Researchers from France, China and ESRF have identified enigmatic fossils from Devonian (400 million years) as fructification of charophyte algae. Charophytes are land plants living in fresh water that still exist. This breakthrough allows researchers to better understand the evolution of these plants of the Paleozoic era and to have an improved overview of the climate at this period. The powerful X-rays at the ESRF were a key to understand the structure of these fossils.

Microtomography: the technique.
Credit: Paul Tafforeau-ESRF

Researchers from the Université de Montpellier II (France), the Institute of Geology of China, and the ESRF have been able to identify some enigmatic fossils from the Devonian period (about 400 million years ago) as fructification of charophyte algae. Charophytes are land plants living in fresh water that still exist nowadays. This breakthrough allows researchers to better understand the evolution of these very old plants of the Paleozoic era and to have an improved overview of the climate at this period. The use of powerful X-rays beams to perform high resolution microtomography at the ESRF was one of the major keys in helping to understand the internal structure of these fossils. The results of this research are published in the latest issue of the American Journal of Botany with the title “New insights into Paleozoic charophyte morphology and phylogeny”.

These fossils belong to the enigmatic group of Sycidiales. Since their discovery, in 1934, no one really knew what they actually were. They had been defined as bracken “seeds”, corals or even small crustacean eggs. Thanks to high resolution X-ray synchrotron microtomography on beamline ID19 at the ESRF, the team of scientists succeeded in investigating the three-dimensional structure of these fossils. The samples they used ranged from 500 micron to 4 mm and originated from all around the world. Synchrotron radiation was fundamental for this study since it revealed microscopic details of the internal anatomy of these fossils without damaging them. At present, no other techniques allowing the study of these structures in a non-destructive way are available.

Charophytes fructifications exhibit a complex evolution. They all have quite a rounded shape, but the oldest ones display vertical structures on their outside surface, while the most recent ones present spiral ones. Fossils studied during this research are from the Paleozoic (or Primary era) and show these vertical structures. What surprised the researchers was the presence of an utricule, which was known before only in some Mesozoic (secondary era) charophytes. An utricule is a supplementary protective layer believed to protect the zygote (reproductive cell) against desiccation. The fact that such a structure was acquired during the evolution of these very old algae means that they probably lived in a harsh environment. This structure could be interpreted as an adaptation to strong seasonality with dry summers leading to ephemeral aquatic environments.

The use of X-ray synchrotron microtomography for this pioneering study on fossil algae opens new doors to paleontology. Indeed, charophytes represent only one group among numerous others of very small fossils. This kind of investigation should hence become a reference for non-destructive three-dimensional approach of small fossils.

Microtomography: the technique

Researchers at the ESRF have presented the possibilities that microtomography offers by showing the steps of a 3D non-destructive investigation by X-ray synchrotron microtomography on a gyrogonite from Late Cretaceous (Mesozoic) period, originating from the South of France. This charophyte doesn’t belong to the Sycidiales, but shows the possibilities of X-ray synchrotron microtomography on small fossils. The first step is a high resolution microradiograph (pixel size of 1.4 microns) showing the spirals twisted from base to apex. From a complete set of microradiographs taken during a half rotation, virtual slices are reconstructed (step 2). From all the slices, we obtain a 3D representation of the sample (step 3) showing its external morphology. Step 4 presents the internal cavity after the “virtual” removal of a part of the gyrogonite wall. Using these 3D data, the team reconstructed a virtual mould inside the gyrogonite (step 5). On this virtual oospore (step 6), numerous details are visible, such as the sutures, the apex, or the basal plate. Image number 7 is an observation with a polarizing microscope of a slide in an equivalent sample.


Story Source:

The above story is based on materials provided by European Synchrotron Radiation Facility. Note: Materials may be edited for content and length.


Cite This Page:

European Synchrotron Radiation Facility. "Virtual Trip To The Heart Of 400 Million Years Old Microfossils." ScienceDaily. ScienceDaily, 25 July 2005. <www.sciencedaily.com/releases/2005/07/050725120135.htm>.
European Synchrotron Radiation Facility. (2005, July 25). Virtual Trip To The Heart Of 400 Million Years Old Microfossils. ScienceDaily. Retrieved September 3, 2014 from www.sciencedaily.com/releases/2005/07/050725120135.htm
European Synchrotron Radiation Facility. "Virtual Trip To The Heart Of 400 Million Years Old Microfossils." ScienceDaily. www.sciencedaily.com/releases/2005/07/050725120135.htm (accessed September 3, 2014).

Share This



More Fossils & Ruins News

Wednesday, September 3, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Did Neanderthals Play Tic-Tac-Toe?

Did Neanderthals Play Tic-Tac-Toe?

Newsy (Sep. 2, 2014) — Artwork found in a Gibraltar cave that was possibly done by Neanderthals suggests they may have been smarter than we all thought. Video provided by Newsy
Powered by NewsLook.com
Millions Of Historical Public Domain Photos Added To Flickr

Millions Of Historical Public Domain Photos Added To Flickr

Newsy (Aug. 30, 2014) — Historian Kalev Leetaru uploaded a large collection of historical photos, images that were previously difficult to collect. Video provided by Newsy
Powered by NewsLook.com
Minds Blown: Scientists Develop Fish That Walk On Land

Minds Blown: Scientists Develop Fish That Walk On Land

Newsy (Aug. 28, 2014) — Canadian scientists looking into the very first land animals took a fish out of water and forced it to walk. Video provided by Newsy
Powered by NewsLook.com
Huge Ancient Wine Cellar Found In Israel

Huge Ancient Wine Cellar Found In Israel

Newsy (Aug. 28, 2014) — An international team uncovered a large ancient wine celler that likely belonged to a Cannonite ruler. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins