Inland seas, or seas built on the continental
shelves. They are generally warm and shallow seas,
usually less than 1,000 feet (300 m) deep, that flood many
continental areas during sea-level high stands, and have in
geologic history been places of great biomass explosions and
species diversification. They form often during supercontinent
dispersal when large volumes of seawater are displaced onto
the continents by voluminous young new oceanic ridges. Shallow
epicontinental seas covered much of the continents after
the breakup of the supercontinents of Gondwana and Pangea.
See also PLATE TECTONICS; SUPERCONTINENT CYCLE.
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