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Showing results for tags 'Leioceras opalinum'.
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I recently tried to find out in which formation this was found and discovered to my consternation that the French don't apply formation names to their lithology. The iron sulphide rich limestone matrix of the Leioceras Beds give the fossils an attractive color. Literature: Rulleau, L. (1979): Geologie et Paleontologie des Carrières Lafarge à Belmont (Rhone), Section Geol. d. Comité d'Entreprise de l'usine du Val d'Azergues Rulleau, L. (1997): Les Ammonites de l'Aalénien de la region lyonnaise, Minéreaux et Fossiles #251, Mai 1997
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Hello, many years ago I got some middle jurassic ammonites from UK, but I have no label. Is it possible to tell from the pics, where they come from, and what they are? I show also the backsides of some specimens because it may help to see the surrounding sediment. The first four specimens are without oolites, the last two ones are in oolitic sediments. My suggestion for the first four ammonites is Leioceras opalinum from Bridport, but it's only a guess. Specimen 5 looks also like Leioceras, but specimen 6 is possibly different (Graphoceras ?). They also differ because of the oolites so they may be from another locality or another layer. Thanks, araucaria1959