Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Small Fossil Remembers When Continents Collided

13.03.2003


When were the mountains of Wales pushed up?

It was well before the dinosaurs roamed the earth. And it happened in the aftermath of a gigantic continental collision, when England and Wales (then attached to southern Newfoundland) crashed into Scotland (then attached to north America). The muds of the sea floor were converted, then, into the hard grey slates of the Welsh hills.

Until now it has been very hard to tell exactly when these slates were formed, because the minerals that make up the slates have been just too tiny for scientists to be able to separate out and measure their age.



New research by paleontologist Jan Zalasiewicz, of the University of Leicester Geology Department, and colleagues from the Open University and the British Geological Survey is now able to shed light on this geological mystery - thanks to some small fossils.

Fossil graptolites - mysterious, extinct planktonic creatures - have been found preserved in the slates, their remains beautifully mineralized in shiny yellow iron pyrites (fool’s gold).

When the muds were crushed into slates, they were deformed around the hard pyritized graptolites. Little spaces opened between the fossils and the rock as this happened, and these spaces were filled with pure new slate-forming minerals.

These minerals were large enough and pure enough for Sarah Sherlock of the Open University to extract and to date, exploiting their natural radioactivity as a kind of natural clock.

The results show that the slates formed 396 million years ago (plus or minus 1.4 million years). This is by far the most precise date extracted from the slates of the Welsh hills, or indeed from slates anywhere in the world.

This pioneering method can now be applied to measure the ages of mountain belts everywhere, since fossils preserved in fool’s gold can be found all around the world.

Ather Mirza | University of Leicester
Further information:
http://www.le.ac.uk/press/ebulletin/
http://www.le.ac.uk/press/experts/

More articles from Earth Sciences:

nachricht Impacts of mass coral die-off on Indian Ocean reefs revealed
21.02.2017 | University of Exeter

nachricht How much biomass grows in the savannah?
16.02.2017 | Friedrich-Schiller-Universität Jena

All articles from Earth Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Breakthrough with a chain of gold atoms

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

In the field of nanoscience, an international team of physicists with participants from Konstanz has achieved a breakthrough in understanding heat transport

Im Focus: DNA repair: a new letter in the cell alphabet

Results reveal how discoveries may be hidden in scientific “blind spots”

Cells need to repair damaged DNA in our genes to prevent the development of cancer and other diseases. Our cells therefore activate and send “repair-proteins”...

Im Focus: Dresdner scientists print tomorrow’s world

The Fraunhofer IWS Dresden and Technische Universität Dresden inaugurated their jointly operated Center for Additive Manufacturing Dresden (AMCD) with a festive ceremony on February 7, 2017. Scientists from various disciplines perform research on materials, additive manufacturing processes and innovative technologies, which build up components in a layer by layer process. This technology opens up new horizons for component design and combinations of functions. For example during fabrication, electrical conductors and sensors are already able to be additively manufactured into components. They provide information about stress conditions of a product during operation.

The 3D-printing technology, or additive manufacturing as it is often called, has long made the step out of scientific research laboratories into industrial...

Im Focus: Mimicking nature's cellular architectures via 3-D printing

Research offers new level of control over the structure of 3-D printed materials

Nature does amazing things with limited design materials. Grass, for example, can support its own weight, resist strong wind loads, and recover after being...

Im Focus: Three Magnetic States for Each Hole

Nanometer-scale magnetic perforated grids could create new possibilities for computing. Together with international colleagues, scientists from the Helmholtz Zentrum Dresden-Rossendorf (HZDR) have shown how a cobalt grid can be reliably programmed at room temperature. In addition they discovered that for every hole ("antidot") three magnetic states can be configured. The results have been published in the journal "Scientific Reports".

Physicist Dr. Rantej Bali from the HZDR, together with scientists from Singapore and Australia, designed a special grid structure in a thin layer of cobalt in...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Booth and panel discussion – The Lindau Nobel Laureate Meetings at the AAAS 2017 Annual Meeting

13.02.2017 | Event News

Complex Loading versus Hidden Reserves

10.02.2017 | Event News

International Conference on Crystal Growth in Freiburg

09.02.2017 | Event News

 
Latest News

Impacts of mass coral die-off on Indian Ocean reefs revealed

21.02.2017 | Earth Sciences

Novel breast tomosynthesis technique reduces screening recall rate

21.02.2017 | Medical Engineering

Use your Voice – and Smart Homes will “LISTEN”

21.02.2017 | Trade Fair News

VideoLinks
B2B-VideoLinks
More VideoLinks >>>