Fossil dating techniques
What rock has not been lost may of course be buried deeply.
The figure to the left shows Precambrian exposure within the United States. and Wisconsin and Minnesota particularly have much old rock, and not surprisingly, considerable Stromatolites and banded iron.
Stromatolites and their close cousins the thrombolites, are rock-like buildups of microbial mats that form in limestone- or dolostone-forming environments.
We humans are, in simple terms, bags of water filled with proteins and prokaryotic bacteria (the bacteria in your body outnumber the cells in your body about 10 to 1).New stromatolite localities have continued to be discovered in various places such as the Bahamas, the Indian Ocean and Yellowstone National Park, to name but a few localities.Stromatolites occur throughout the world, but become diminishingly uncommon in the Archaean.Microbial communities diversified through time, with eukaryotic organisms eventually joining the mix.Excluding some exceedingly rare Precambrian fossils such as the Russian White Sea Ediacaran fauna, stromatolites and thare the only fossils encoding the first 7/8th of the history of life on earth.
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They encode the role that ancient microorganisms played in the evolution of life on earth and in shaping earth's environments.