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[Comparative characteristics of the numbers of microorganisms in soils and their basement sedimentary rocks].

Comparative studies on the quantitative composition of microorganisms in soils and basement sedimentary rocks have shown that the latter are rich in microorganisms. The number of microorganisms in basement grounds changes with time, thus indicating their activity. The qualitative composition is poor. At the same time, the total quantity of microorganisms in basement layers is equal to that in soil. Basement layers contain 10 times more microorganisms than eutrophic water reservoirs and 1000 times more than oligotrophic water reservoirs.