from Live Science:
During a recent marine excursion, researchers searching for lobster larva unexpectedly discovered a geologic wonder: a 50-million-year-old cluster of extinct volcanoes submerged in the water off eastern Australia.
The four volcanoes are located about 155 miles (250 kilometers) off the coast of Sydney, the researchers found during the mission, which lasted from June 3 to 18. The scientists immediately recognized them as calderas, a cauldronlike structure that forms after a volcano erupts and collapses into itself, creating a crater. The largest extinct volcano measures about 1 mile (1.5 km) across and towers about 0.4 miles (700 meters) above the seafloor, the researchers said.
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