Biostratigraphic, paleoecologic and biologic significance of the Silurian (Llandovery) acritarch<i>Beromia rexroadii</i>gen. emend. et sp. Nov., mid‐continent and Eastern United States

Wood, Gordon D.

doi:10.1080/01916122.1996.9989474

Cited by 9 publications

(1 citation statement)

References 34 publications

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“…listerii Smelror, 1987, MPK 14236, MPA 55432, slide 1, U38/0, [7b]; (e) Ammonidium cf. listerii , MPK 14237, MPA 55432, slide 1, S49/0, [7b]; (f) Carminella maplewoodensis Cramer, 1968, MPK 14238, MPA 55435, slide 1, H41/4, [7f]; (g) Beromia rexroadii Wood, 1996, MPK 14239, MPA 55435, slide 1, R53/0, [7f]; (h) Dactylofusa estillis Cramer & Díez de Cramer, 1972, MPK 14240, MPA 55447, slide 2, G49/3, [14c]; (i, j) Eupoikilofusa rochesterensis Cramer ex Eisenack et al . 1976, MPK 14241, MPA 55442, slide 1, F65/0, (j) detail of ornament, [11d]; (k) Tunisphaeridium parvum Deunff & Evitt, 1968, MPK 14242, MPA 55447, slide 2, G60/2, [14c]; (l) Multiplicisphaeridium cf.…”

Section: Biostratigraphymentioning

confidence: 99%

A revised sedimentary and biostratigraphical architecture for the Type Llandovery area, Central Wales

et al. 2012

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-The global standard for the Llandovery Series (early Silurian) in central Wales is re-assessed in the light of detailed geological surveying, biostratigraphical sampling and a rigorous examination of published datasets. A new sedimentary and biostratigraphical architecture is presented. Key graptolite, brachiopod, acritarch and, for the first time, chitinozoan assemblages are critically assessed. Upper Hirnantian to Aeronian strata record events that followed the Late Ordovician glacial maximum and comprise a series of progradational sequences bounded by flooding surfaces, but inferred still to be glacioeustatic in origin. Significant faunal renewals associated with many of the flooding levels underpin their potential for international recognition. Compound non-sequences are a feature of proximal parts of the system where erosion associated with fault footwall uplift was an important process. Extensive slump sheets contribute to further stratal loss and displacement in distal facies. A re-assessment of the Aeronian Stage GSSP reveals shortcomings with the biostratigraphical criteria used in its selection. Telychian portions of the succession display the disrupting effects of intraWenlock synsedimentary sliding; hence the relevance of key published fossil assemblages and the criteria used to erect the stage GSSP are undermined. However, the Llandovery area remains one of the best studied early Silurian successions in the world. This, together with regional considerations, supports the retention of the series standard in mid Wales where the contiguous deep-water basinal succession affords internationally cited exposure of richly graptolitic facies for the whole series and, significantly, for the post-sedgwickii Biozone interval.

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Section: Biostratigraphymentioning

confidence: 99%