2019
DOI: 10.1101/2019.12.19.882829
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Abstract: 9Molecular divergence dating has the potential to overcome the incompleteness of the fossil record in 10 inferring when cladogenetic events (splits, divergences) happened, but needs to be calibrated by the 11 fossil record. Ideally but unrealistically, this would require practitioners to be specialists in molecular 12 evolution, in the phylogeny and the fossil record of all sampled taxa, and in the chronostratigraphy of 13 the sites the fossils were found in. Paleontologists have therefore tried to help by pub… Show more

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Cited by 8 publications
(19 citation statements)
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References 309 publications
(744 reference statements)
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“…The choices of hard vs. soft bounds do not seem to make a great difference to the big picture. Due to practical constraints, a set of calibration ages mostly identical to the present ones was analyzed twice, with all bounds treated as soft or as hard, in the first preprint of this work (Marjanović, 2019); the results were quite similar to each other (Marjanović, 2019: figure 1 and table 2). Even so, however, in the run where all bounds were soft, most divergence dates were younger than in the run where all bounds were hard (usually negligibly so, but by 20 Ma in the extreme cases); the mean ages of some calibrated nodes even ended up younger than their minimum ages.…”
Section: Hard and Soft Minima And Maximamentioning
confidence: 52%
“…More likely, Lethiscus and the other aïstopods are rather early-branching stem-stegocephalians [PN] (Pardo et al, 2017(Pardo et al, , 2018Clack et al, 2019; further discussion in Marjanović and Laurin, 2019). Whether Casineria from a geographically (southeastern Scotland) and stratigraphically close site (mid-late Viséan: Paton et al, 1999;Smithson et al, 2012) can replace it in that function depends on two unresolved issues: its own phylogenetic position, for which estimates range from very close to Amniota (within Tetrapoda) into Temnospondyli (Marjanović and Laurin, 2019, and references therein;Clack et al, 2019;Daza et al, 2020: supplementary figure S15), and the controversial phylogenetic position of Lissamphibia [PN] in the stegocephalian tree (Marjanović andLaurin, 2013a, 2019;Danto et al, 2019;Laurin et al, 2019;Daza et al, 2020;Pardo et al, 2020; and references in all five), which determines whether the temnospondyls are tetrapods or quite rootward stem-stegocephalians by determining which node of the otherwise largely stable tree of early stegocephalians bears the name Tetrapoda. Anderson et al (2015) reported a number of isolated anthracosaur [PN] (embolomere or eoherpetid) bones from a mid-Tournaisian site (the Tournaisian preceded the Viséan and began at the Devonian/Carboniferous boundary 358.9 ± 0.4 Ma ago: ICSC).…”
Section: Calibrationsmentioning
confidence: 99%
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“…It provides useful, if partly outdated, information to generate calibration constraints for more than 200 clades and does so on a transparent forum that is open to the whole scientific community. Note however that knowledge about fossil data is constantly evolving (see e.g., Marjanović, 2019) and databases such as the Fossil Calibration Database require ongoing and constant efforts in order to remain relevant.…”
Section: Pre-processing Of Fossil Datamentioning
confidence: 99%