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To assess the reservoir effect, the age characteristics of a stromatolite from Poacher’s Point were investigated by 14C dating both carbonate and organic residue from samples at different depths in the deposit.

The ~15-cm-diameter stromatolite was separated into 12 zones from the center to the edge and block samples were cut from each zone; the carbonate and residual organic residue were dated separately.

This idea is beautifully illustrated by the research efforts of a team of Australian scientists.

Climate change has triggered the excessive melting of ice and snow in western Greenland.

These microbes thrived in a shallow sea bathing a still young and fresh Earth, according to a study in this week’s “What we’ve done is produce something tangible,” Nutman says, “an actual fossil record (that is) evidence for life at those times.”The researchers “were able to see evidence for life in a way that I had never expected,” says Texas A&M University’s Michael Tice, who was not associated with the study.

“We have a much better window back in time, thanks to what these folks did.”The fossil was discovered in a barren stretch of Greenland that researchers have patiently explored for some three decades.

We believe that the organic ages are an accurate estimate of the stromatolite’s age, while the much older carbonate ages reflect incorporation of old carbon from limestone bedrock and ancient calcrete introduced by stream and spring flow.

Excluding the 2 oldest organic ages (15,700 and 13,600 14C yr BP), which may reflect contamination by older organic material washed into the lake during flooding, a linear regression relationship between carbonate and organic ages indicates that the reservoir effect on carbonate ranges up to ~24,000 14C yr BP but decreases slightly as the true age of the deposit increases.

The ages were used to suggest that the basin was not extensively flooded during the last 40,000 yr.Such early life would also make life on Mars seem less of a long shot.The newfound remains consist of a layer of rock that, to the untutored eye, looks, well ... Scientists say it’s actually a stromatolite, a mineral structure created by the busywork of countless microorganisms."These structures represent an entire ecosystem of surprising diversity," she says.They may even rival stromatolites with fossils dating back 3.49 billion years.




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