But the dominant theory nowadays is that primitive microorganisms first assembled in hot, chemical-rich water at hydrothermal vents at the bottom of the ocean.
One reason for favouring this marine model is that fossil evidence of early land-based microbial life has been lacking.
Some say the spheres were formed by a natural process of concretion. Some of the so-called Klerksdorp spheres are elliptical in shape with rough ridges around the center.
In short, Genesis was an allegory and not literal history.
They were found in 3.5-billion-year-old rocks in an extinct volcano in the Dresser Formation in the hot, dry, remote Pilbara region of Western Australia.
The fossils include stromatolites – layered rock structures created by microorganisms – and circular holes left in the rock by gas bubbles that look like they were once trapped by sticky microbial substances.
“On the other hand, the globes, which have a fibrous structure on the inside with a shell around it, are very hard and cannot be scratched, even by steel.
The Mohs scale of hardness is named after Friedrich Mohs, who chose ten minerals as references points for comparative hardness, with talc the softest and diamond the hardest.” Steel ranks about a 6.5 to 7.5 on the Mohs scale, so the spheres would be harder than that, according to Marx.
New fossil evidence suggests the first spark of life may have occurred in a hot spring on land rather than a hydrothermal vent in the deep sea.