Absolute carbon dating of fossils trina rapper dating kenyon martin
The fossils, preserved in Gunflint chert, capture ancient microbes in the act of feasting on a cyanobacterium-like fossil called Gunflintia — with the perforated sheaths of Gunflintia being the discarded leftovers of this early meal.
A team, led by Dr David Wacey of the University of Western Australia and Bergen University, Norway, and Professor Martin Brasier of Oxford University, reports in this week’s Proceedings of the National Academy of Sciences the fossil evidence for how this type of feeding on organic matter — called ‘heterotrophy’ — was taking place.
The team also found that these Gunflintia fossils carried clusters of even smaller (c.1 micron) spherical and rod-shaped bacteria that were seemingly in the process of consuming their hosts.
Dr Wacey said that: ‘recent geochemical analyses have shown that the sulfur-based activities of bacteria can likely be traced back to 3,500 million years or so — a finding reported by our group in Nature Geoscience in 2011.
Volcanoes are not entirely off the hook, according to this new scenario; they have simply been demoted to accessories to the crime.Whilst the Gunflint fossils are only about half as old, they confirm that such bacteria were indeed flourishing by 1,900 million years ago.And that they were also highly particular about what they chose to eat.’ Dec.‘Whilst there is chemical evidence suggesting that this mode of feeding dates back 3,500 million years, in this study for the first time we identify how it was happening and ‘who was eating who’.
In fact we’ve all experienced modern bacteria feeding in this way as that’s where that ‘rotten egg’ whiff of hydrogen sulfide comes from in a blocked drain.
“A rapid initial injection of carbon dioxide from a volcano would be followed by a gradual decrease,” Fournier says.