A detailed record of the C34n/C33r magnetozone boundary for the definition of the base of the Campanian Stage at the Bottaccione section (Gubbio, Italy)

We provide an updated and detailed magnetostratigraphy across the C34n/C33r polarity reversal boundary at the Bottaccione section (Gubbio, Italy) that represents a candidate GSSP for the base of the Campanian Stage (Late Cretaceous). The position of the C34n/C33r boundary is stratigraphically located at 221.525 +/- 0.075 m in agreement with previous estimates from the literature. Following a critical review of data from the literature, we assign a nominal age of 83.06 +/- 0.18 Ma to the observed C34n/C33r polarity reversal boundary and an average rate of deposition of the Santonian/Campanian boundary Scaglia Rossa Formation of 1.09 +/- 0.25 cm/kyr (similar to 11 m/Myr). We also assess the paleolatitude of deposition of the Scaglia Rossa at Bottaccione by correcting the characteristic remanent magnetization component directions for sedimentary inclination flattening, obtaining a value of 21.1 degrees N (+/- 1.6 degrees).