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How did shallow seas shape the environments of Silurian continents?
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Silurian Period
Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the middle part of the Silurian Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.
During the Silurian Period, the melting of Late Ordovician glaciers caused a dramatic rise in global sea levels, which flooded large expanses of continental platforms with shallow seas. These environments significantly shaped the Silurian world in several ways:12
- Ecological Habitats: In tropical and subtropical zones, these shallow waters fostered the widespread growth of mound-type coral reefs (bioherms). These reefs, along with other seafloor environments, supported diverse communities of invertebrates, including brachiopods, gastropods, crinoids, and trilobites.13
- Sedimentation and Geography: The flooding of continental platforms created muted seafloor topography, leading to consistent faunal distributions across different regions. In arid areas with restricted circulation, such as shallow embayments, the evaporation of these waters led to the deposition of evaporites.34
- Biological Distribution: The widespread nature of these shallow seas allowed for a transition from the strong faunal endemism of the Ordovician to a period where many species were distributed globally. Communities adapted to these environments based on bathymetric gradients, with some species thriving in nearshore, high-energy waters and others in deeper, quieter zones.35