Which cnidarian group is geologically important because growth of its members can result in the formation of islands and reefs?

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Anthozoans, specifically the stony or reef-building corals, are geologically important because their growth and accumulation over time can result in the formation of islands and reefs. The calcium carbonate skeletons left behind by these organisms can build up and create large underwater structures that eventually become exposed as land masses. Hydrozoans and Scyphozoans are not typically involved in reef formation, and Turbellarians and Ctenophores are not cnidarians.

Which Cnidarian Group Is Geologically Important Because Growth of Its