marine biome epeiric sea biome 2010-03-15T11:23:23Z ENVO ENVO:01000045 ORCID:0000-0002-4366-3088 The epeiric sea (also known as an epicontinental sea) biome comprises a shallow seas that extend over part of a continent. Epeiric seas are usually associated with the marine transgressions of the geologic past, which have variously been due to either global eustatic sea level changes, local tectonic deformation, or both, and are occasionally semi-cyclic. epicontinental sea biome