Geochemical Constraints on the Origin and Impact of a Large 3He Enhancement Event in the Late Cretaceous

Data File 1. Helium and non-carbonate fraction data of 80-Ma Scaglia Rossa Limestone from Apiro, Italy and Marine Sediment Cores from ODP Site 1207 Data File 2. Trace metal data of 80-Ma Scaglia Rossa Limestone from Apiro, Italy Data File 3. Paleomagnetic data of 80-Ma Scaglia Rossa Limestone from Apiro, Italy Data File 4. Sedimentation rate model Data File 5. Reccurrence rate and Poisson probability of geomagnetic reversals Data File 6. Poynting-Robertson time of cosmic dust produced in an asteroid collision