The Lord Howe Seamount Chain of which Gifford Guyot  is an eruptive centre, and part of a pair of coral-capped guyots, formed during the Miocene. The Gifford Marine Park is co-located off the Queensland coast near Brisbane.
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Geology
The Gifford guyots are two flat‐topped basaltic seamounts, now caped with carbonate sediments with the larger  Gifford Guyot dated at 15.6 million years ago but the smaller unnamed seamount of unknown age. They both raise from an abyssal plain  below sea level to generally flat summits that are about  below sea level. This summit plateau is about  for the  unnamed guyot), and  in area for Gifford Guyot itself.

See also

 Gifford Marine Park

References 

Guyots
Hotspot tracks
Volcanoes of Zealandia
Seamounts of the Pacific Ocean
Seamounts of the Tasman Sea