Lower Toarcian organic-rich sediments from the Tuscan Succession (Northern Apennines, Italy): preliminary results
Keywords:
black shales, Early Toarcian, calcareous nannofossils, Tuscan Nappe, Northern Apennines, ItalyAbstract
For the first time is here documented the presence of Lower Toarcian black shales in the lower portion of the Calcari e marne a Posidonia (Posidonia Marls auctt.) belonging to the Tuscan Nappe. It consists of alternations of 30 cm to 5 m thick black laminated marlstone and marly claystone, with TOC values ranging from 0.43% to 2.49%. Based on calcareous nannofossils, the basal portion of the Calcari e marne a Posidonia spans the Lotharingius hauffii to Carinolithus superbus zones, and the organic-rich interval lies within the Carinolithus superbus ZoneDownloads
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