Acritarchs from the Floian (Early Ordovician) of the Montagne Noire, France: biostratigraphical and palaeobiogeographical implications
Caillaud, Virgile, Birolini, Enzo, Lefebvre, Bertrand, Manzano, Eiver Gelan, Michel, Soline, Regnier, Sylvie, Vaucher, Romain, and Servais, Thomas (2026) Acritarchs from the Floian (Early Ordovician) of the Montagne Noire, France: biostratigraphical and palaeobiogeographical implications. Lethaia, 59 (2).
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Abstract
This present study describes the acritarch assemblages from the siltstone and claystone of the Landeyran Formation of southern Montagne Noire, France displaying the Early Ordovician Cabrières Biota, and from the coeval Landeyran section. The moderately to well-preserved organic-walled microfossils allow the identification of a rich and diverse palynoflora bearing different important biostratigraphical and palaeobiogeographical markers. The presence of typical Early Ordovician index species, such as Coryphidium bohemicum, Ampullula spp., Barakella spp., together with the absence of the genera Arkonia, Frankea, Orthosphaeridium and Dicrodiacrodium, allow an assignment to the late-middle to early-late Floian (transition Fl2 to Fl3), confirming biostratigraphical data from trilobite and graptolite biozonations. The presence of the genera Acanthodiacrodium, Arbusculidium, Coryphidium and Striatotheca enables the attribution of the southern Montagne Noire area to the peri-Gondwana acritarch province in high southern latitudes. The presence of the genus Ampullula in the late Floian in the southern peri-Gondwana province allows a modification of its First Appearance Datum in this province where it was previously only recorded from the early Darriwilian.
| Item ID: | 91922 |
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| Item Type: | Article (Research - C1) |
| ISSN: | 1502-3931 |
| Copyright Information: | Copyright © 2026 Author(s). This is an open access article distributed under the terms of the Creative Commons CC-BY 4.0 License. Published by Scandinavian University Press on behalf of Lethaia Foundation. |
| Date Deposited: | 13 May 2026 00:12 |
| FoR Codes: | 37 EARTH SCIENCES > 3705 Geology > 370506 Palaeontology (incl. palynology) @ 100% |
| SEO Codes: | 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280107 Expanding knowledge in the earth sciences @ 100% |
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