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<p><strong>Abstract.</strong> A combined geochemical and micropalaeontological study of the late Albian 'Amadeus Segment' of the Aptian–Albian organic-rich Scisti a Fucoidi Formation in central Italy shows that planktic foraminiferal assemblages record changes in abundance and composition which are markedly related to CaCO<sub>3</sub> and Total Organic Carbon content of the sediments. The distribution pattern of different genera seems to record changes in nutrient supply and surface waterdoi:10.1144/jm.17.1.87 fatcat:srlfdg3s5zbzxesr65g7cclsse