THE LOWER AND UPPER BOUNDARIES OF THE LOWER CAMBRIAN ON THE SIBERIAN PLATFORM

Abstract

The Siberian Platform is well characterized paleontologically, sedimentologically, and geochemically. This makes it a suitable region for choosing the stratotypes of the lower and upper boundaries of the Lower Cambrian. However, the correlation of these boundaries both within the region and outside it is still 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 by organic fossils among bioherms and are correlated with boundaries in facies-different sections.