A fossiliferous spherule-rich bed at the Cretaceous–Paleogene (K–Pg) boundary in Mississippi, USA: Implications for the K–Pg mass extinction event in the Mississippi Embayment and Eastern Gulf Coastal Plain - Witts, James; Landman, Neil; Garb, Matthew; Boas, Caitlin; Larina, Ekaterina; Rovelli, Remy; Edwards, Lucy; Sherrell, Robert; Cochran, J. (Cretaceous Research, 2018)