Abstract
Existence of diverse microorganisms, bacteria (? Cyanobacteria) in the Early Precambrian (Archaean and Early Proterozoic) weathering crusts is determined. Presence of eukaryots can’t be excluded also. So it is possible to speak about the colonization of land by microbes already at that time and about existence of single series from weathering crusts (primitive soils) to real soils.
Highlights
The study of the origin and early evolution of life on Earth are fundamental scientific problems
The only reliable evidences of continental conditions existence are weathering crusts. Often they are the only source of information about exogenous processes and subsequently about conditions under which the development of biosphere occurred in Early Precambrian
Complex of diverse fossil microorganisms in ancient weathering crusts was discovered in result of electronic-microscope investigations, and conclusion about possibility of land colonization by microbes from the very beginning of geological annals was made (Rozanov et al, 2008; Rozanov & Astafieva, 2009; Astafieva et al, 2009)
Summary
The study of the origin and early evolution of life on Earth are fundamental scientific problems. These problems embrace investigation of ancient life both in marine and land conditions. The only reliable evidences of continental conditions existence are weathering crusts. Often they are the only source of information about exogenous processes and subsequently about conditions under which the development of biosphere occurred in Early Precambrian. Weathering profiles in all geological settings are reliable witnesses of continental regimes and in the Precambrian structures they often give unique information about continental features which led to biosphere development (Rozanov et al, 2008). Complex of diverse fossil microorganisms in ancient weathering crusts was discovered in result of electronic-microscope investigations, and conclusion about possibility of land colonization by microbes from the very beginning of geological annals was made (Rozanov et al, 2008; Rozanov & Astafieva, 2009; Astafieva et al, 2009)
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