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Where the level of the underlying earth allows, the corals grow around the coast to form what he called fringing reefs, and can eventually grow out from the shore to become a barrier reef.Where the bottom is rising, fringing reefs can grow around the coast, but coral raised above sea level dies and becomes white limestone.Sea level was then 120 m (390 ft) lower than in the 21st century.As sea level rose, the water and the corals encroached on what had been hills of the Australian coastal plain.

The polyps belong to a group of animals known as Cnidaria, which also includes sea anemones and jellyfish.Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals.Coral reefs are built by colonies of tiny animals found in marine water that contain few nutrients.Barrier reefs and atolls do not usually form complete circles, but are broken in places by storms.Like sea level rise, a rapidly subsiding bottom can overwhelm coral growth, killing the coral polyps and the reef, due to what is called coral drowning.

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The corals could then overgrow the hills, forming the present cays and reefs.