Supplementary Data 1—Formal classification of the Bissekty Formation’s fauna collected over seven years by URBAC (provided by J.D. Archibald). Symbols refer to the taxa collected from the IFCs (-), CBI-14 (*), and CBI-4e (+) for this study. Taxa in bold are restricted to marine environments. Underlined taxa are tolerant of brackish conditions. Taxa underlined with a dashed line could be tolerant of brackish conditions.