2.1 Geologic setting
Epeiric seaways were widespread throughout much of the Late Ordovician as a result of elevated eustatic sea levels (Rasmussen et al., 2019). Widespread carbonate deposition dominated these epeiric seaways with carbonate successions found even in mid-latitude settings such as the paleocontinent of Baltica (Fig. 1). Subsequently, nearly every marine setting records a major decrease in sea level during the latest Katian and Hirnantian marked by subaerially exposed carbonate platforms and significantly reduced shallow-water marine habitats.