The use of chemostratigraphy to refine ambiguous sequence stratigraphic correlations in marine mudrocks. An example from the Woodford Shale, Oklahoma, USA

Online Supplemental Figure 1: The chemofacies profile for the Hunton Anticline Quarry–Outcrop B. Hierarchical clustering analysis subdivided the geochemical profiles into seven distinct chemofacies. The sample resolution for this chemofacies profile is 1 foot (30cm). The most notable trend in this profile is a shift from restricted bottom water conditions at the base to well circulated conditions towards the top of the section. This coincides with a shift from retrogradational stacking patterns associated with a regional transgression, to progradational stacking patterns associated with the onset a regional regression.