Stromatolite fossil dating

Earth’s violent surface, floating on tectonic plates, is subjected to volcanism, subduction (into the earth’s mantle), uplift, metamorphism, and enormous erosion forces.

Lateral gene transfer belies the concept of the single common ancestor (see Woese, 1998).

While formation by colonies of cyanobacteria is probably the primary mechanism for formation of surviving stromatolites in the deep time of the Archaean and half way through the Proterozoic, it is unlikely to have been the only mechanism.

So too have many Stromatolites from the Proterozoic.

Production of stromatolites has been relatively minor during the Phanerzoic Eon with its entirely different reef ecosystems.

A common definition goes something like: A lamiated rock formed by the growth of blue-green algae (i.e., cyanobacteria)".

This definition is, in fact, such a gross oversimplification as be scientifically useless.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.They maintain and recycle the atomic ingredients of which proteins, the essence of life, are made, including oxygen, nitrogen and carbon.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).Recent research (Gupta, 1998a, 1998b, and an extensive literature) indicates the other prokaryotic and the most genetically diverse domain of life, the Archaeans, evolved alongside each other and possibly swapped genes with the Eubacteria.

Tags: , ,