New biostratigraphic and chronostratigraphic data from the Sautou formation and adjacent strata (Cambrian, Givonne inlier, Revin group, Northern France) and some lithostratigraphic and tectonic implications
Vanguestaine, M.; Léonard, R. (2005). New biostratigraphic and chronostratigraphic data from the Sautou formation and adjacent strata (Cambrian, Givonne inlier, Revin group, Northern France) and some lithostratigraphic and tectonic implications. Geol. Belg. 8(4): 131-144
In: Geologica Belgica. Geologica Belgica: Brussels . ISSN 1374-8505; e-ISSN 2034-1954, more
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| Keywords |
Geological time > Phanerozoic > Paleozoic > Palaeozoic > Cambrian
Acritarcha [WoRMS]; Acritarchs
France, Champagne [Marine Regions]
Marine/Coastal |
| Author keywords |
Acritarchs, Revin Group, Givonne Inlier, northern France, Middle-Upper Cambrian, lithostratigraphy, chronostratigraphy |
| Authors | | Top |
- Vanguestaine, M., more
- Léonard, R.
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| Abstract |
In the western part of the Givonne Inlier, the “Falizette” and the “Claire-Terne de la Borne” rivers exhibit sections described as belonging, in ascending order, to the La Chapelle (Rv2), Illy (Rv3) and Sautou (Rv4) Formations. The “Falizette” section yielded acritarchs of zone 4 (locally 4b) similar to assemblages observed earlier (Vanguestaine, 1978) in the “Givonne” and “ Hatrelle” valleys of the Givonne Inlier. In the “Terne de la Borne” section, the strata described as belonging to the Illy Formation and most part of the Sautou Formation, the latter in its type locality, provided acritarchs of zone 2 (and possibly 1) and do not correlate therefore with the Rv3 and the Rv4 of the Rocroi Inlier but with Rv2 (and possibly Rv1) of the same area. This correlation is reinforced by the observation in the sequence of a roo? ng slate seam, previously undescribed, a possible equivalent of the Peureux Member, characterizing the upper part of Rv1 in the Rocroi Inlier. Besides specimens pointing to an acritarch biozone 2 assemblage, the richest sample of the Sautou Formation also yielded rare examples of acritarch species which have not previously been recorded in Belgium or the surrounding areas. They are Adara alea, Celtiberium geminum, possibly Eliasum llaniscum, Multiplicisphaeridium martae and Retisphaeridium postae. The probable metazoan Ceratophyton vernicosum has also been observed. Compared to the well dated Newfoundland Cambrian succession, acritarch biozones 2 assemblages indicates a mid Middle Cambrian age. This new chronostratigraphic result not only allows a better calibration of the Belgian acritarch zonation with respect to the acritarch and trilobite international zonations but also con? rms our interpretation of the lithostratigraphic succession. |
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