. . . "Conventional scientific wisdom has it that plants and other creatures have only lived on land for about 500 million years, and that landscapes of the early Earth were as barren as Mars.Interpretive image of Diskagma buttoniiA new study, led by geologist Gregory J. Retallack of the University of Oregon, now has presented evidence for life on land that is four times as old ??? at 2.2 billion years a" .