Checking How Old the Origin of Life Is

The sulfate-reducing bacteria are usually known to be harmful organisms which produce hydrogen sulfide. However, here the author will mention that they offer us a novel clue as to how long ago the origins of life occurred. 

what is the situation of much older strata than the Cambrian period The iron ore strata in the Canadian Shield are known to have been formed 2750 million years ago. The isotopic ratio of the sulfide ores in the strata is 22.49, and this ratio suggests that the number of the bacteria which resided in the strata was one tenth of that of the bacteria in the present day. The strata in the Isua area in West Greenland are known to have been formed 3700 million years ago. The isotopic ratio of the sulfide ores in the strata is 22.24. The researchers have concluded that this ratio suggests that the bacteria have not resided in the strata. Therefore, the age of the 

Geologic time division Years ago (unit million years) 32S / 34S 

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