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

Online Supplemental Figure 5: A colourised version of Figure 6. The chemofacies profile for the Wyche Farm Quarry Core - 1. Hierarchical clustering analysis subdivided the geochemical profiles into seven distinct chemofacies. The sample resolution for this chemofacies profile is 2 inches (5cm). The legend indicates how many horizons fall within each cluster. 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. At this location, the top of the Woodford Shale is a gradational contact at a depth of 68ft (21m).