Scientists have been arguing for years about microscopic structures in 3.5-billion-year-old rocks: Some think they are the earliest fossilized life yet found, while others see just geology. A new ...

Hematite crystals in Australian rocks hint that Earth’s atmosphere was oxygenated earlier than previously thought. ... Rock samples from the Marble Bar Chert “are rosy red” from oxidation, ...

(PhysOrg.com) -- It appears that the supposed oldest examples of life on our planet -- 3.5 billion-year-old bacteria fossils found in Australian rock called Apex Chert -- are nothing more than ...

Sedimentary rock "chert" records cooling of the Earth over billions of years Research team analyses oxygen isotopes in 550 million-year-old samples ...

Strange Crystals Reveal Rock to be Ancient Meteorite. News. By Nola Taylor Tillman published 3 January 2012 When you purchase through links on our site, we may earn an affiliate commission.

NASA announced this week that rocks made of pure sulfur have been discovered on the Red Planet.. The yellow sulfur crystals in a pure form have never been seen before on Mars.Earlier findings have ...