Many natural science studies do not take into account two interrelated fundamental trends - directionality and repeatability. In this connection, the author of the article puts forward the hypothesis that geological cycles should be characterized by a tendency to increase their duration. This is confirmed by large-scale variations in the duration of the established cycles, as well as by the analysis of Phanerozoic boreal transgressions on the territory of Russia.

In the case of mutational layering, the layered boundaries of sedimentary strata act as either spatial or temporal boundaries. In the case of mutation layering, these boundaries contain spatial and temporal information. It is shown that when considering the migration mechanism of layering formation against the background of different sedimentation regimes, the same boundary can be transformed into temporal, spatial, and spatial-temporal boundaries.

The change of layers in sections of sedimentary strata, as it is known, is evidence of the change of conditions of sedimentation. At the same time, the boundaries between the layers may have varying degrees of expression.

The question of the meaningful connection and relationship between stratigraphy and cyclostratigraphy arose with new vigor in the 1970s as a result of the successful development of sedimentary cyclicity.

The problem of reliable dissection of Quaternary sediments in the north-west of the European territory of the USSR has become particularly acute in connection with the search for construction raw materials and the expansion of reclamation works .....

The reconstruction of the history of sedimentation processes is invariably based on the analysis of the composition, structure and correlation of rocks composing geological sections. For such an analysis, a convenient and currently accepted form of depiction is the construction of geologic sections in the scale of thickness of layers.

Conversion of geologic sections from the power scale to the time scale opens up the possibility of applying harmonic analysis to reveal periods of the still large cyclicity of sedimentation processes. At the same time, such an analysis of geological sections is impossible without representing them in the form of periodic curves, i.e., without their formalization.

In the present article the results of granulometric analysis of gravel and pebble and conglomerate deposits developed in the territory of southwestern Kyzylkum and belonging to the Tashakyr and Sadyvar formations of Pliocene-Quaternary age are considered and compared ...