Millennial-scale climate changes manifest Milankovitch combination tones and Hallstatt solar cycles in the Devonian greenhouse world: COMMENT

Grygar, Tomáš Matys

doi:10.1130/g46452c.1

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…A recently described process which more clearly unfolded how laminae are quickly produced and able to cover large areas, is a combination of high fluid shear and sediment concentration (Al-Mufti & Arnott, 2023). In conclusion, there are many indications that presumed varves in pre-Pleistocene outcrops have been deposited much more quickly than on a yearly basis, which may be discovered by detailed studies (Matys Grygar, 2019;Smith, 2019Smith, , 2023 reinterpreting 60 recently published papers on this subject; Kochhann et al, 2020;Isbell et al, 2021;Molén, 2021).…”

Section: Laminated Sedimentsmentioning

confidence: 89%

Patterns, processes and models - an analytical review of current ambiguous interpretations of the evidence for pre-Pleistocene glaciations

Molén

2023

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Models (paradigms) and former interpretations have often been presupposed when conducting field research. In the 19th century diamictites were for the first time interpreted to have originated from ancient glaciations. These interpretations have to a large part prevailed in the geological community, although there has been much progress in the areas of sedimentology, glaciology and physical geography. The present work is an effort to find criteria which most clearly discriminate between geological features produced by different processes, mainly glaciation and mass flow, the latter predominantly sediment gravity flows. Geological features which have been interpreted to have formed by glaciation throughout pre-Pleistocene Earth history are compared to similar-appearing geological features formed by mass flow and tectonics, so as to uncover variations in the appearance between features resulting from these different processes. The starting point for this comparison is documentation of the appearance of Quaternary products of erosion and deposition, in order to discern the origin of older formations. It is shown that the appearance and origin of pavements, dropstones, valleys, small-scale landforms, surface microtextures and most other geological features may in some cases be equivocal, but in others the details are indicative of the process which generated the feature. Detailed geological field data which have been compiled by geologists from outcrops of pre-Pleistocene strata, more often than is considered in most papers, commonly point to a mass flow origin, mainly a sediment gravity flow origin, rather than a glaciogenic origin. A process of multiple working hypotheses or interpretations is therefore advocated, based mainly on a comparison of the appearance of features formed by different geological processes documented from different research disciplines. Instead of starting with current interpretations or models, this multiple working hypothesis or methodology helps to avoid confirmation bias and jumping to conclusions.

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Section: Laminated Sedimentsmentioning

confidence: 89%

Patterns, processes and models - an analytical review of current ambiguous interpretations of the evidence for pre-Pleistocene glaciations

Molén

2023

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“…Lateral correlation of sediment profiles is conventionally required to interpret sedimentary basin fills without the interference of autogenic processes (e.g., Uličný et al, 2009). Similarly, true orbital (climatic) signals should be tested for lateral stability and independence of sediment lithology (Ait-Itto et al, 2018;Matys Grygar, 2019;Weedon et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Lithological correction of chemical weathering proxies based on K, Rb, and Mg contents for isolation of orbital signals in clastic sedimentary archives

Grygar

Mach²,

Hron

et al. 2020

Sedimentary Geology

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“…Selective identification of frequencies adds to this statistical multiplicity, as does Da Silva et al's inclusion of combination tones in the range of target frequencies, further eroding the reliability of CLs; correction for these additional sources of statistical multiplicity is more difficult. Further difficulty arises if one starts to consider the prior probability that the sediments of the Prague Formation are capable of recording the cycles claimed by Da Silva et al What, for example, is the probability that climate is the principal control, either on the geochemical signal or on the relative contributions of carbonates and clastics; and what are the likely effects of differential diagenesis and compaction (Matys Grygar, 2019)? The least that can be asserted is that the prior probability is very unlikely to be 100%, requiring yet more upward adjustment to any CLs.…”

mentioning

confidence: 99%