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• n  rock formed from consolidated clay sediments

News & Articles

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• Remnants Of Complex Ecosystem Found In A 3.5 Billion-Year-Old Sedimentary Rock Sequence In Australia
  April Flowers for redOrbit.com - Your Universe Online Scientists trying to reconstruct the rise of life during the period of Earth's history when it first evolved find the task daunting because the planet's oldest sedimentary rocks are not only rare, but nearly always altered by hydrothermal and tectonic activity. A new study, published in the journal Astrobiology , reveals the well-preserved ...
  Nov. 13, 2013 - redOrbit
• Evidence of 3.5-billion-year-old bacterial ecosystems found in Australia
  Reconstructing the rise of life during the period of Earth's history when it first evolved is challenging. Earth's oldest sedimentary rocks are not only rare, but also almost always altered by hydrothermal and tectonic activity. A new study has revealed the well-preserved remnants of a complex ecosystem in a nearly 3.5 billion-year-old sedimentary rock sequence in Australia.
  Nov. 12, 2013 - Science Daily