Stratigraphy of the Billegrav-2 drill core, Denmark, with Mo contents obtained using Core Scanning X-Ray Fluorescence spectrometry (0.2 mm resolution, 8 seconds per scan) on the outer surface of the core. The green dots represent Mo data obtained by XRF and the black curve represents the LOESS fit through the Mo data. A total of 51 oxygenation events are identified (grey, –) and the visually most prominent events are given a name (black, —). Fossil occurrences modified after ref.30. Br – brachiopod. T – Trilobite.