Changes in distribution, volumes, and rates of deposition of sedimentary and volcanogenic deposits during the Phanerozoic (within the present continents)

Ronov, A. B.; Khain, V. E.; Balukhovskiy, A. N.; Seslavinskiy, K. B.

doi:10.1080/00206817709471134

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…This assumption seems reasonable, but some exceptions to it have been documented. One such exception is the Permian system, which contains unusually large amounts of evaporites (Ronov et al, 1977;Stevens, 1977). Included here is the assumption that diagenetic destruction of lower Paleozoic fossils is no less common than diagenetic destruction of Cenozoic fossils.…”

Section: A Methods For Predicting Apparent Species Richnessmentioning

confidence: 99%

“…In this case the apparent species richness predicted for the period would be much higher than the species richness actually ob- served. The data compiled by Ronov et al (1977) show that the proportions of the different sediment groups have changed drastically at various times in the Phanerozoic. Therefore, any justification for making this assumption must be regarded as tenous.…”

Section: A Methods For Predicting Apparent Species Richnessmentioning

confidence: 99%

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Species richness in the Phanerozoic: an investigation of sampling effects

Signor

1978

Paleobiology

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Given estimates of the variation in total standing species richness through the periods of the Phanerozoic, mean species duration, and the relative intensity of the sampling of the fauna from each of the periods, the expected number of described species can be predicted for each period of the Phanerozoic using an analytic sampling model. This model is based on the assumption that the relative abundances of species in any geologic period can be approximated by the canonical (lognormal) species-abundance distribution.Three commonly cited models of standing species richness (Valentine, 1973; Gould et al., 1977; Bambach, 1977) each suggest different patterns of species richness in the Phanerozoic. By assuming that sampling of the fossil record is proportionate to sediment volume, it can be shown with the sampling model that the Empirical, Equilibrium, and Species-Richness Models each predict that the number of described species will be strongly correlated with sediment volume. Equally high correlations are predicted if it is assumed that sampling is proportionate to sediment area or to paleontological interest. The correlations predicted for each of the three models are remarkably similar. The impact of sampling effects is so strong that the variations in species richness postulated by these three models are almost completely obscured. Preservational biases will probably only further obscure the relationship between the number of described species and total species richness. Therefore, it seems likely that analysis of trends in the total number of described species will be of little use in determining trends in worldwide species richness in the Phanerozoic.Comparison of the actual patterns of variation in the number of described species and the expected numbers of described species predicted by the sampling model reveals that more species are known from the Cenozoic than would be predicted from the abundance of Cenozoic sediments or from the amount of paleontological interest in the Cenozoic. This might have resulted from the Cenozoic sediments remaining relatively free of diagenetic effects which might have destroyed the fossils entombed in the sediments.

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Section: A Methods For Predicting Apparent Species Richnessmentioning

confidence: 99%

Section: A Methods For Predicting Apparent Species Richnessmentioning

confidence: 99%

Species richness in the Phanerozoic: an investigation of sampling effects

Signor

1978

Paleobiology

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“…The crucial defining feature of the Great Unconformity is that erosion occurred across a vast area, especially the cratonic interior. The most quantitative reflection of this feature is arguably provided by the coeval stepwise increase in preserved sediment abundance per unit time across the unconformity—a step change first accurately quantified by Ronov et al ( 7 , 8 ) and Ronov ( 9 ) and observed on every continent with the possible exception of Africa. This fivefold discontinuity in global preserved sediment abundance ( 8 ) suggests profound changes in both erosional and depositional processes ( 5 ) and in any event provides a quantitative metric for the significance of the Great Unconformity as a global feature.…”

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confidence: 95%

Thermochronologic constraints on the origin of the Great Unconformity

McDannell

Keller

Guenthner

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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The origin of the phenomenon known as the Great Unconformity has been a fundamental yet unresolved problem in the geosciences for over a century. Recent hypotheses advocate either global continental exhumation averaging 3 to 5 km during Cryogenian (717 to 635 Ma) snowball Earth glaciations or, alternatively, diachronous episodic exhumation throughout the Neoproterozoic (1,000 to 540 Ma) due to plate tectonic reorganization from supercontinent assembly and breakup. To test these hypotheses, the temporal patterns of Neoproterozoic thermal histories were evaluated for four North American locations using previously published medium- to low-temperature thermochronology and geologic information. We present inverse time–temperature simulations within a Bayesian modeling framework that record a consistent signal of relatively rapid, high-magnitude cooling of ∼120 to 200 °C interpreted as erosional exhumation of upper crustal basement during the Cryogenian. These models imply widespread, synchronous cooling consistent with at least ∼3 to 5 km of unroofing during snowball Earth glaciations, but also demonstrate that plate tectonic drivers, with the potential to cause both exhumation and burial, may have significantly influenced the thermal history in regions that were undergoing deformation concomitant with glaciation. In the cratonic interior, however, glaciation remains the only plausible mechanism that satisfies the required timing, magnitude, and broad spatial pattern of continental erosion revealed by our thermochronological inversions. To obtain a full picture of the extent and synchroneity of such erosional exhumation, studies on stable cratonic crust below the Great Unconformity must be repeated on all continents.

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“…His general conclusion was that it is erroneous to think that there have been worldwide transgressions and regressions in geologic history. This problem, as A. L. Yanshin [1,20]. After analyzing quantitative data on changes in areas of epicontinental seas during the Phanerozoic, we came to the conclusion that global transgressions and regressions did actually take place and that they were confined to particular stages of the Caledonian, Hercynian and Alpine cycles of Earth history.…”

mentioning

confidence: 94%