500
1. Oceanic volcano/island becomes colonized by reef building corals
2. Coral growth begins a fringing reef and oceanic volcano/island slowly begins to sink.
3. island continues to sink and fringing reef turns into a barrier reef. water between reef and island is a lagoon.
4. Island is completely submerged and and atoll is brought about.
What is the Darwin-Dana Daly theory of atoll formation?