The Siberian Platform is well characterized paleontologically, sedimentologically, and geochemically. This makes it a suitable region for choosing stratotypes of the lower and upper boundaries of the Lower Cambrian. However, the correlation of these boundaries both within and outside the region is stilI disputable. The article considers one of the possible reasons for this disagreement, which rests upon the fact that the boundaries are drawn in most sections using organic fossils among bioherms and are correlated with boundaries in different facies sections.
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