Geomagnetic polarity during the early Silurian: The first magnetostratigraphy of the Llandovery

Hounslow, Mark W.; Harris, Samuel; Wójcik, Krystian; Nawrocki, Jerzy; Woodcock, Nigel; Ratcliffe, Kenneth T.; Montgomery, Paul

doi:10.1016/j.palaeo.2021.110245

Cited by 4 publications

(12 citation statements)

References 82 publications

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“…2a,b). This low in MS is similar in magnitude to that seen in the Rhuddanian at the Bardo Stawy section from the Holy Cross Mts (Hounslow et al 2021b; Fig. 2a).…”

Section: Magnetic Susceptibility Changes In the Coressupporting

confidence: 76%

The Telychian (early Silurian) oxygenation event in northern Europe: A geochemical and magnetic perspective

Hounslow

Ratcliffe

Harris

et al. 2021

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…2a,b). This low in MS is similar in magnitude to that seen in the Rhuddanian at the Bardo Stawy section from the Holy Cross Mts (Hounslow et al 2021b; Fig. 2a).…”

Section: Magnetic Susceptibility Changes In the Coressupporting

confidence: 76%

The Telychian (early Silurian) oxygenation event in northern Europe: A geochemical and magnetic perspective

Hounslow

Ratcliffe

Harris

et al. 2021

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…AMS data for the Grabowiec-6 core. This also shows the data for the Telychian described by Hounslow et al (2021). The lower hemisphere AMS maximum (K 1 ) and minimum (K 3 ) axes are shown in the stereonets and the ellipsoid shape and intensity (T versus h%).…”

Section: Sandstonesmentioning

confidence: 55%

“…Both K 1 and K 3 are spread out in a girdle normal to the bedding-cleavage intersection, with some from the Ashgill Fm and Spengill Mbr showing evidence of K 3 normal to the cleavage ('cleavage fabrics'), or an inverse fabric to the cleavage ('inverse cleavage fabrics') expressed by the K 1 axes normal to the cleavage. The inverse fabrics are likely the results of Fe-Mn carbonates in the section (seeHounslow et al, 2021, for more details, and the comparison to the larger set of Silurian data).…”

mentioning

confidence: 87%

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A geomagnetic polarity stratigraphy for the Middle and Upper Ordovician

Hounslow

Harris

Wójcik

et al. 2021

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…The level of metamorphism suggests that the strata may have been too heated to resolve a primary magnetostratigraphical record. The most recently published data suggests that all or most of the revolutus Biozone and all of the early-mid-Aeronian occur within an interval of reversed polarity (Hounslow et al 2021).…”

Section: Level Of the Proposed Global Stratotype Section And Pointmentioning

confidence: 99%

Integrated stratigraphical study of the Rhuddanian-Aeronian (Llandovery, Silurian) boundary succession in the Rheidol Gorge, Wales: a proposed Global Stratotype Section and Point for the base of the Aeronian Stage

Melchin¹,

Davies²,

Boom³

et al. 2023

LET

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The Rheidol Gorge section, approximately 17 km east of Aberystwyth, mid Wales, exposes a ca. 20 m-thick succession of Llandovery (Silurian) strata from the upper Rhuddanian Pernerograptus revolutus Biozone through the lower Aeronian Demirastrites triangulatus Biozone and basal Neodiplograptus magnus Biozone. The section records deposition under a range of bottom-water oxygenation states. The Rhuddanian-Aeronian boundary is located 0.8 m above an abrupt lithological change from predominantly organic-poor, bioturbated 'oxic' mudrocks to an interval of black, richly graptolitic 'anoxic' shales. The graptolite fauna through the boundary interval, including the local lowest occurrence of D. triangulatus, allows precise correlation with other parts of the world. Graptolite assemblages indicative of separate divisions in the underlying revolutus Biozone and of the lower and upper parts of the triangulatus Biozone are also present. Chitinozoans are relatively well preserved in the section and indicate the Spinachitina maennili Biozone throughout the boundary interval, as is widely the case. The results of carbon isotope analyses from organic matter indistinctly show the weak interval of positive shift in δ 13 C org values through the Rhuddanian-Aeronian boundary interval, as observed globally, though local or regional processes appear largely to overprint the global signal. Overall, the excellent biostratigraphical record, well-documented local and regional stratigraphical context, historical significance, as well as easy access and assured longterm preservation, mean that the Rheidol Gorge section can be proposed as a strong candidate for a new Global Stratotype Section and Point for the base of the Aeronian Stage.

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Geomagnetic polarity during the early Silurian: The first magnetostratigraphy of the Llandovery

Cited by 4 publications

References 82 publications

The Telychian (early Silurian) oxygenation event in northern Europe: A geochemical and magnetic perspective

The Telychian (early Silurian) oxygenation event in northern Europe: A geochemical and magnetic perspective

A geomagnetic polarity stratigraphy for the Middle and Upper Ordovician

Integrated stratigraphical study of the Rhuddanian-Aeronian (Llandovery, Silurian) boundary succession in the Rheidol Gorge, Wales: a proposed Global Stratotype Section and Point for the base of the Aeronian Stage

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