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CYCLOSTRATIGRAPHIC CHART OF THE MESO - NEOZOIC (CENOZOIC) TIME
Abstract
This scheme is based on the idea that the stratigraphic limits of this time interval (251 ma) correspond to the temporal positions of a large number of distinct dynamic moments (change of meaning of the radial motions) linked with two cycles: Valach climatic cycle (VhCCy ? 4.1 ma, pulsations of the Solar System) and Raup-Sepkoski cycle (RSCy ? 26.78 ma, pulsations of our galaxy). Many of these moments, often perceived as tectonic phases or as important extinctions, led various global changes which allowed the separation of the chronostratigraphic units of the current scale of geological time. So, this chart aims to calibrate the stratigraphic limits of the Meso-Neozoic time relative to temporal positions of some dynamic moments of the aforementioned cycles. But, the dynamic moments associated to the VhCCy are very common (at every 2.05 ma), while those due to the RS cycle are rarer (at 13.39 ma). The dynamic series connected with the VhCCy has, as a temporal reference, the Rhodanian tectonic phase (5.33 ma, occurred at Miocene-Pliocene limit), and the RSCy series has for temporal reference, the Wallachian phase, occurred 2.58 ma ago, at the Pliocene-Quaternary limit. The previous term of RS series was linked by us (in this work) with the Burdigalian-Langhian limit (15.97 ma), so much so that it was possible to correct the RS cycle duration (from 26 to 26.78 ma). The calibration of the stratigraphic limits of the Meso-Neozoic time was practically done by moving (with minimal values of corrections) the reference value of these limits to the nearest temporal positions belonging to both dynamic series (VhCCy and RSCy). Because the dynamic moments of the RS series are rare, we get in fact a characterization of these geochronologic units, from the view of the VhCCy (period, climatic phases). It can be seen that some units have a temporal extension of 2.05 ma and others have 4.1 ma, 6.15 ma, 8.2 ma, 10.25 ma and 12.3 ma. But these latter units also have subunits with the duration equal to the period of the Valach cycle, sometimes with distinct names, with the Aptian as a great example. From this perspective it?s important to note that the Miocene (18.45 ma) corresponds with 4.5 Valach cycles. In addition, the limits of these units are placed either inside a VhCCy cold phase (for Miocene-Pliocene limit and for the limits corresponding to the temporal values 5.33 + 4.1 ma x n) or inside a VhCCy warm phase (for Tortonian-Messinian limit and for the limits corresponding to the temporal values of the series 7.38 + 4.1 ma x n). Among limits that can be calibrated in relation to the dynamic moments of the RS cycle, are mentioned: Thanetian?Ypresian, Valanginian?Hauterivian and Norian?Rethian. These calibrations enable us to presume that the Cretaceous?Paleogene limit is not related to our two series, thus corresponding with a dynamic moment of higher order (probably Vail?Payton megacycle) or with an unusual astronomical moment.
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