Testing the limits of chronostratigraphic resolution in the Appalachian Basin, Late Devonian (middle Frasnian), eastern North America: New U-Pb zircon dates for the Belpre Tephra suite

Lanik, Amanda; Over, D. Jeffrey; Schmitz, Mark D.; Kirchgasser, William T.

doi:10.1130/b31408.1

Cited by 9 publications

(6 citation statements)

References 23 publications

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“…D16: Lanik et al (2016) dated a tephra layer from the Belpre Tephra Suite, Tennessee, USA at 375.55 ± 0.10(0.21)[0.44] Ma. They associated this age with Frasnian Zones 5-8, which they say is approximately equivalent to the upper part of the lower Palmatolepis hassi zone.…”

Section: Assignment Of Relative Stratigraphic Position To Radioisotopic Agesmentioning

confidence: 99%

Recalibrating the Devonian time scale: A new method for integrating radioisotopic and astrochronologic ages in a Bayesian framework

et al. 2021

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The numerous biotic, climatic, and tectonic events of the Devonian cannot be correlated and investigated without a well-calibrated time scale. Here, we updated the calibration of the Devonian time scale using a Bayesian age-depth model that incorporates radioisotopic ages and astrochronology durations. We used existing radioisotopic ages collected and harmonized in the last two geologic time scale compilations, as well as new U-Pb zircon ages from Emsian {Hercules I K-bentonite, Wetteldorf, Germany: 394.290 ± 0.097(0.21)[0.47] Ma} and Eifelian K-bentonites {Tioga B and Tioga F K-bentonites, Fayette, New York, USA: 390.82 ± 0.18(0.26)[0.48] Ma and 390.14 ± 0.14(0.23)[0.47] Ma, respectively}. We anchored floating astrochronology stage durations on radioisotopic ages and chained astrochronologic constraints and uncertainty together to extrapolate conditioning age likelihoods up or down the geologic time scale, which is a new method for integrating astrochronology into age-depth modeling. The modeling results in similar ages and durations for Devonian stages regardless of starting biostratigraphic scaling assumptions. We produced a set of rescaled biostratigraphic zonations, and a new numerical calibration of Devonian stage boundary ages with robust uncertainty estimates, which allow us to evaluate future targets for Devonian time scale research. These methods are broadly applicable for time scale work and provide a template for an integrated stratigraphic approach to time scale modeling.

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Section: Assignment Of Relative Stratigraphic Position To Radioisotopic Agesmentioning

confidence: 99%

Recalibrating the Devonian time scale: A new method for integrating radioisotopic and astrochronologic ages in a Bayesian framework

et al. 2021

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“…Thus, the assignment on the Becker scale is not straightforward, so we have assigned D12 to span the E. excavatus and E. gronbergi zones on the Becker 2012 scale. Becker et al (2020) D17: Lanik et al (2016) dated a second tephra layer from the Belpre Tephra Suite, Tennessee, USA at 375.25 ± 0.13(0.22)[0.45] Ma. D17 was collected in the same site as D16 and yields a younger age D16, consistent with D17 being found stratigraphically higher than D16.…”

Section: Assignment Of Relative Stratigraphic Position To Radioisotopic Agesmentioning

confidence: 99%

Section: Assignment Of Relative Stratigraphic Position To Radioisotopic Agesmentioning

confidence: 99%

“…D18: Lanik et al (2016) dated a tephra layer from the Rhinestreet Formation, New York, USA at 375.14 ± 0.12(0.22)[0.45] Ma. This age is younger than D17 which is contrary to what Lanik et al (2016) expected given the biostratigraphic constraints that place this tephra layer in Frasnian Zone 7, a constraint which would make this layer older than D17. They discuss this conflict between the radioisotopic ages and the biostratigraphic constraints and conclude that the zonal boundaries are within the resolution of the uncertainty on the radioisotopic ages.…”

Section: Assignment Of Relative Stratigraphic Position To Radioisotopic Agesmentioning

confidence: 99%

“…costatus zone through the T.k. australis zone.D16:Lanik et al (2016) dated a tephra layer from the Belpre Tephra Suite, Tennessee, USA at 375.55 ± 0.10(0.21)[0.44] Ma. They associated this age with Frasnian Zones 5-8, which they say is approximately equivalent to the upper part of the lower Palmatolepis hassi zone.…”

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confidence: 99%

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