Reply to Discussion on ‘A high-precision U–Pb age constraint on the Rhynie Chert Konservat-Lagerstätte: time scale and other implications’

Parry, Sara; Crowley, Quentin; Wellman, Charles H.

doi:10.1144/jgs2012-089

Cited by 17 publications

(10 citation statements)

References 19 publications

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“…R. Soc. B 285: 20172631 have been dated to the early Pragian to early Emsian [70] and the andesite beneath the Rhynie Chert has been dated to 411 Ma [70,71], though the temporal relationship between the andesite and the chert is subject to controversy [72,73]. Here, Rhyniognatha hirsti is considered to be approximately 407 Myr in age.…”

Section: Sedimentological and Palaeontological Datamentioning

confidence: 99%

PhanerozoicpO₂and the early evolution of terrestrial animals

et al. 2018

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Concurrent gaps in the Late Devonian/Mississippian fossil records of insects and tetrapods (i.e. Romer's Gap) have been attributed to physiological suppression by low atmospheric O Here, updated stable isotope inputs inform a reconstruction of Phanerozoic oxygen levels that contradicts the low oxygen hypothesis (and contradicts the purported role of oxygen in the evolution of gigantic insects during the late Palaeozoic), but reconciles isotope-based calculations with other proxies, like charcoal. Furthermore, statistical analysis demonstrates that the gap between the first Devonian insect and earliest diverse insect assemblages of the Pennsylvanian (Bashkirian Stage) requires no special explanation if insects were neither diverse nor abundant prior to the evolution of wings. Rather than tracking physiological constraint, the fossil record may accurately record the transformative evolutionary impact of insect flight.

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Section: Sedimentological and Palaeontological Datamentioning

confidence: 99%

PhanerozoicpO₂and the early evolution of terrestrial animals

et al. 2018

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“…Radiometric dating of the underlying Milton of Noth Andesite at ca. 411 Ma (Parry et al, 2013(Parry et al, , 2011 has been subject to a dispute over its temporal relationship to hot spring activity associated with the cherts (Mark et al, 2013(Mark et al, , 2011 and predates the biostratigraphic dating of the Rhynie Chert relative to the global dating of the base of the Pragian Stage. Therefore, a soft maximum constraint may be defined at 411 Ma for the Rhynie Chert.…”

Section: Age Justificationmentioning

confidence: 99%

Fossil Calibrations for the Arthropod Tree of Life

Wolfe

Daley

Legg³

et al. 2016

Preprint

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Fossil age data and molecular sequences are increasingly combined to establish a timescale for the Tree of Life. Arthropods, as the most species-rich and morphologically disparate animal phylum, have received substantial attention, particularly with regard to questions such as the timing of habitat shifts (e.g., terrestrialisation), genome evolution (e.g., gene family duplication and functional evolution), origins of novel characters and behaviours (e.g., wings and flight, venom, silk), biogeography, rate of diversification (e.g., Cambrian explosion, insect coevolution with angiosperms, evolution of crab body plans), and the evolution of arthropod microbiomes. We present herein a series of rigorously vetted calibration fossils for arthropod evolutionary history, taking into account recently published guidelines for best practice in fossil calibration. These are restricted to Palaeozoic and Mesozoic fossils, no deeper than ordinal taxonomic level, nonetheless resulting in 79 fossil calibrations for 101 clades. This work is especially timely owing to the rapid growth of molecular sequence data and the fact that many included fossils have been described within the last five years. This contribution provides a resource for systematists and other biologists interested in deep-time questions in arthropod evolution.

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“…The Rhynie chert is situated about 50 km NW of Aberdeen, Scotland [10]. Radiometric ages vary from 407.6 ± 2.2 Ma [48] to 411.5 ± 1.3 Ma [49], with reported differences probably reflecting methodology, geological assumptions, and any of several potential geologic sources of error. We favor the age of 407.6 ± 2.2 Ma, because it is consistent with the chronostratic interval given by the spore assemblage biozone [50] and the corresponding numerical ages for stage boundaries in the Geologic Timescale.…”

Section: Experimental Model and Subject Detailsmentioning

confidence: 99%