Unconformities in the stratification of the earth's crust

Abstract

The phenomena of unconformity in the layered structure of the earth's crust have recently acquired great significance as indicators of a break, disruption or complication of the normal course of historical development of the earth's crust, expressed mainly in the conformable accumulation of sedimentary strata. They formed the basis for establishing the epochs of so-called diastrophism, and they are also associated with the determination of the age of folding both in relation to its large periods and smaller phases. In view of such an important fundamental significance of these phenomena, one can ask whether their content is sufficiently clearly and completely defined and how correctly the specific weight of the observed phenomenon of unconformity is determined in geological practice. It should therefore be noted that in the world geological literature the classification of unconformity phenomena is given in too summary a form, which is far from corresponding to the modern level of structural analysis of the earth's crust. In the context of a significant expansion at the present time of our ideas about the movements of the earth's crust and a more in-depth understanding of their historical development, it is necessary to revise this terminology, now undoubtedly outdated, and on the basis of rational classification of these phenomena to provide new terminology for practical work - deciphering sections of the earth's crust.