Abstract
Stable isotopes ( 13C, 18O), CaCO 3 content, carbon content insoluble in HCl (C org) and in the carbonates (C carb), and foraminifers have been investigated in the Cenomanian/Turonian boundary interval ( Rotalipora cushmani Zone and lower Whiteinella archaeocretacea Zone) in southeast Central Poland. A higher content of C org in the uppermost Rotalipora cushmani Zone and lowermost Whiteinella archaeocretacea Zone, a δ 13C and δ 18O stable isotope anomaly in the uppermost Cenomanian, and substantial changes in the foraminiferal assemblages have been recorded. A major carbon stable isotope excursion with a shift of up to +1.6‰ (PDB) recorded in the lower part of the Whiteinella archaeocretacea Zone within the marly limestone in the uppermost Cenomanian. A late Cenomanian expanding oxygen minimum zone is thought to be responsible for changes in foraminiferal assemblages.
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