Abstract
UPPER DEVONIAN ROCKS OF THE NORTH OF FRA.NCE.—In a recent communication to the Geological Society of the North of France, Prof. Gosselet has brought forward some important new data, obtained from some fresh railway-cuttings between Féron and Semeries, as to the classification and palæontology of the Upper Devonian rocks. Arranging the Upper Devonian into an inferior group—the Frasnien comprising the zone of Rhynchonella cuboides and that of Cardium palmatum, and a superior group—the Famennien, in which are placed the Schistes de Famenne, the Psammites de Condros, and the Calcaire d'Etrœungt, he proceeds to show that in sections exposed in the railway-cuttings with a perfect conformable succession of strata and of fossils, the zone of the Psammites de Condros, so well marked elsewhere in the north of France and Belgium, is absent. He regards this arenaceous series to be represented in the district between Avesnes and Fburmies by argillaceous shales. It is easy to recognise at least an upper and lower member in the Famennian group. The former is distinguished by the prevalence of Carboniferous forms, particularly Sfirifer laminosus, the latter by the rarity of Carboniferous forms and by the abundance of Cyrtia Murchisoniana. Every fresh section which tends to elucidate the relations of the Devonian rocks to the formations below and above them possesses a special interest for British geologists.
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Geological Notes . Nature 21, 164–165 (1879). https://doi.org/10.1038/021164b0
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DOI: https://doi.org/10.1038/021164b0