Banded Iron Formations (Jaspilites)-a Paleontologist's View
The results of fossil bacteria studying show that mineral formation under the influence of bacteria or with their participation is a process that took place on Earth always and everywhere (after the appearance of bacteria). The uniformity of rocks and rock formation of Precambrian and Devonian indicate the similarity of conditions that existed on Earth at that time—in the Archean, Proterozoic and Devonian—during the formation of the studied rocks.