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Correlation of Mississippian (Upper Viséan) foraminiferan, conodont, miospore and ammonoid zonal schemes, and correlation with the Asbian–Brigantian boundary in northwest Ireland by P. Cózar; I. D. Somerville; W. I. Mitchell; P. Medina‐Varea is a Earth and Planetary Sciences article available to read on EtoBox.

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The microbiota of the upper Vise ́an (Asbian-Brigantian) rocks in the Lough Allen Basin in northwest Ireland is analysed. The Middle Mississippian sequence studied extends from the upper part of the Dartry Limestone/Bricklieve Limestone formations of the Tyrone Group to the Carraun Shale Formation of the Leitrim Group. The rocks have been traditionally dated by ammonoid faunas representing the B 2a to P 2c subzones. The Meenymore Formation (base of the Leitrim Group) also contains conodont faunas of the informal partial-range Mestognathus bipluti zone. The upper Brigantian Lochriea nodosa Conodont Zone was recognized by previous authors in the middle of the Carraun Shale Formation (Ardvarney Limestone Member), where it coincides with upper Brigantian ammonoids of the Lusitanoceras granosus Subzone (P 2a ). Foraminifera and algae in the top of the Dartry Limestone Formation are assigned to the upper Cf6 Foraminifera Subzone (highest Asbian), whereas those in the Meenymore Formation belong to the lower Cf6 Foraminifera Subzone (lower Brigantian). The Dartry Limestone Formation-Meenymore Formation boundary is thus correlated with the Asbian-Brigantian boundary in northwest Ireland. F

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Author

P. Cózar; I. D. Somerville; W. I. Mitchell; P. Medina‐Varea

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0072-1050)

Published

2006

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)