Nannofossil biostratigraphy, strontium and carbon isotope stratigraphy, cyclostratigraphy and an astronomically calibrated duration of the Late Campanian <i>Radotruncana calcarata</i> Zone.

Bulk oxygen isotopes of marl beds of the Postalm section show a decreasing trend from values around −0.80‰ at the base of the zone to values around −1.20‰ at the top. 4.4 Strontium isotope stratigraphy Corrected values adjusted to the NBS987 (Sr) international standard give a range of strontium isotope ratios for the calcarata Zone of 0.707655 ± 0.000018–0.707722 ± 0.000004 in the Postalm section (mean of 15 samples 0.707679).

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Much better and highly significant results ( p ( t ) < 0.01) are obtained fitting marl thicknesses by sinusoidal regression with fixed period length of 405 kyr.

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The power spectral analysis based on the thickness of marl layers shows a strong peak close to significance that corresponds to a period of 20 layers.

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