ISOTOPE STRATIGRAPHY OF THE VISÉAN CARBONATES IN THE ST. LOUIS AND STE. GENEVIEVE MEMBERS OF THE SLADE FORMATION IN SOUTHEAST KENTUCKY
A detailed stratigraphic column accompanies this research and includes correlations among the sites tuned to the isotope and mineralogical data. d13C values range between -1.2‰ and 4.7‰ and d18O values range between -8.8‰ and 2.4‰ with a trend toward more negative values higher in the section. The Ste. Genevieve member is relatively pure calcite with occasional chert. In contrast, the St. Louis member is comprised of several dolomitic and silica rich zones. d18O values are enriched in the heavier isotope in these dolomitic zones, by as much as +6‰, suggesting a strong connection to isotopic alternation during burial diagenesis and dolomitizaton. d13C values are depleted in the heavier isotope adjacent to lag surface indicated in the field by algal laminates, breccia, and paleosol and associated with the boundaries of depositional cycles that are 2-3 meters in scale.