The Britannia Guyots (also known as Britannia Bank, Britannia Tablemount, Britannia Tablemounts, Brittania Guyots or Brittania Tablemounts) are a line of extinct volcanic seamounts in the Tasmantid Seamount Chain. They are basaltic volcanoes that erupted between 17,600,000 and 20,800,000 years ago, with survey data that indicates they rise about above the local sea floor to a minimum depth of . The sediments deposited on top of the alkali olivine basalt originate from the early Middle

Miocene The Miocene ( ) is the first epoch (geology), geological epoch of the Neogene Period and extends from about (Ma). The Miocene was named by Scottish geologist Charles Lyell; the name comes from the Greek words (', "less") and (', "new") and mea ...

when the ocean water was tropical to subtropical. They were described as

seamount A seamount is a large submarine landform that rises from the ocean floor without reaching the water surface (sea level), and thus is not an island, islet, or cliff-rock. Seamounts are typically formed from extinct volcanoes that rise abruptly a ...

s in 1961. The waters above it are incorporated in the Central Eastern Marine Park, an Australian marine park.

References

{{reflist Seamounts of the Tasman Sea Guyots Hotspot volcanoes Polygenetic volcanoes Miocene volcanoes Volcanoes of the Tasman Sea